{
  "name": "Mount Sinai, New York",
  "url": "https://longislandtraffic.com/towns/suffolk/mount-sinai/",
  "updated": "2026-09-17",
  "publisher": "Long Island Traffic (https://longislandtraffic.com)",
  "methodology": "https://longislandtraffic.com/towns/methodology/",
  "reuse": "Quote with credit and a link to the page URL above. Underlying federal and state datasets are public records.",
  "geography": {
    "slug": "mount-sinai",
    "county": "suffolk",
    "censusName": "Mount Sinai CDP",
    "geoType": "census-designated place",
    "legalStatus": "hamlet (unincorporated)",
    "geoid": "3649066",
    "gnisId": "2389517",
    "pop2020": 11623,
    "housingUnits2020": 4339,
    "landSqMi": 6,
    "waterSqMi": 1.44,
    "densityPerSqMi": 1937,
    "internalPoint": [
      40.94178,
      -73.02024
    ],
    "parentTown": "Brookhaven town",
    "parentTownGeoid": "3610310000",
    "townShares": [
      {
        "name": "Brookhaven town",
        "share": 1
      }
    ]
  },
  "fatalCrashes2010to2024": {
    "period": "2010–2024",
    "crashes": 18,
    "deaths": 20,
    "pedestrianDeaths": 1,
    "bicyclistDeaths": 0,
    "motorcyclistDeaths": 2,
    "crashesWithDriverBac08": 5,
    "multiFatalityCrashes": 1,
    "onLimitedAccessHighways": {
      "crashes": 0,
      "deaths": 0
    },
    "deathsPer100kResidentsPerYear": 11.5,
    "byYear": [
      {
        "year": 2010,
        "crashes": 2,
        "deaths": 2
      },
      {
        "year": 2011,
        "crashes": 1,
        "deaths": 1
      },
      {
        "year": 2012,
        "crashes": 0,
        "deaths": 0
      },
      {
        "year": 2013,
        "crashes": 1,
        "deaths": 1
      },
      {
        "year": 2014,
        "crashes": 2,
        "deaths": 2
      },
      {
        "year": 2015,
        "crashes": 2,
        "deaths": 2
      },
      {
        "year": 2016,
        "crashes": 3,
        "deaths": 3
      },
      {
        "year": 2017,
        "crashes": 0,
        "deaths": 0
      },
      {
        "year": 2018,
        "crashes": 0,
        "deaths": 0
      },
      {
        "year": 2019,
        "crashes": 2,
        "deaths": 4
      },
      {
        "year": 2020,
        "crashes": 0,
        "deaths": 0
      },
      {
        "year": 2021,
        "crashes": 1,
        "deaths": 1
      },
      {
        "year": 2022,
        "crashes": 2,
        "deaths": 2
      },
      {
        "year": 2023,
        "crashes": 2,
        "deaths": 2
      },
      {
        "year": 2024,
        "crashes": 0,
        "deaths": 0
      }
    ],
    "byTimeOfDay": {
      "known": 18,
      "morning6to10": 2,
      "midday10to16": 2,
      "evening16to20": 6,
      "night20to6": 8
    },
    "darkShare": 0.611,
    "topRoads": [
      {
        "name": "Northern Boulevard / Route 25A",
        "slug": "route-25a-north-shore",
        "crashes": 5,
        "deaths": 5
      },
      {
        "name": "North Ocean Avenue / Patchogue–Mount Sinai Road (CR 83)",
        "slug": null,
        "crashes": 5,
        "deaths": 5
      },
      {
        "name": "Mt Sinai Coram Rd",
        "slug": null,
        "crashes": 2,
        "deaths": 4
      },
      {
        "name": "Chestnut St",
        "slug": null,
        "crashes": 2,
        "deaths": 2
      },
      {
        "name": "N Country Rd",
        "slug": null,
        "crashes": 2,
        "deaths": 2
      },
      {
        "name": "228 N Country Rd",
        "slug": null,
        "crashes": 1,
        "deaths": 1
      },
      {
        "name": "43 Plymouth Ave",
        "slug": null,
        "crashes": 1,
        "deaths": 1
      }
    ],
    "roadOwnership": {
      "period": "2015–2024",
      "crashes": 12,
      "owners": [
        {
          "owner": "Town or Township Highway Agency",
          "crashes": 6
        },
        {
          "owner": "State Highway Agency",
          "crashes": 3
        },
        {
          "owner": "County Highway Agency",
          "crashes": 3
        }
      ]
    }
  },
  "allReportedCrashes": {
    "years": [
      "2021",
      "2022",
      "2023",
      "2024"
    ],
    "scope": "parent-town",
    "municipalityCode": "BROOKHAVEN",
    "label": "Town of Brookhaven",
    "total": 44155,
    "fatal": 172,
    "injury": 11428,
    "propertyDamageOnly": 32555,
    "byYear": {
      "2021": 10663,
      "2022": 10234,
      "2023": 11739,
      "2024": 11519
    },
    "pedestrian": 445,
    "bicyclist": 390,
    "deer": 599,
    "otherAnimal": 1027
  },
  "commute": {
    "workers16plus": 5124,
    "commutersNotWorkingFromHome": 4465,
    "meanTravelMinutes": {
      "value": 37.3,
      "moe": 10.5,
      "lowReliability": false
    },
    "pct60MinPlus": {
      "value": 20.8,
      "moe": 6.7,
      "lowReliability": false
    },
    "pct90MinPlus": {
      "value": 7.9,
      "moe": 5.1,
      "lowReliability": true
    },
    "pctUnder15Min": {
      "value": 17.4,
      "moe": 4.3,
      "lowReliability": false
    },
    "pctDroveAlone": {
      "value": 74.6,
      "moe": 1.4,
      "lowReliability": false
    },
    "pctCarpooled": {
      "value": 9.1,
      "moe": 6.3,
      "lowReliability": true
    },
    "pctPublicTransit": {
      "value": 2.2,
      "moe": 1.5,
      "lowReliability": true
    },
    "pctCommuterRail": {
      "value": 1.8,
      "moe": 1.4,
      "lowReliability": true
    },
    "pctBus": {
      "value": 0.4,
      "moe": 0.5,
      "lowReliability": true
    },
    "pctWalked": {
      "value": 0.2,
      "moe": 0.3,
      "lowReliability": true
    },
    "pctBicycle": {
      "value": 0,
      "moe": 0.4,
      "lowReliability": true
    },
    "pctWorkedFromHome": {
      "value": 12.9,
      "moe": 3.1,
      "lowReliability": false
    },
    "pctLeaveBefore6am": {
      "value": 11.1,
      "moe": 3.9,
      "lowReliability": false
    },
    "pctLeaveBefore7am": {
      "value": 25.7,
      "moe": 4.9,
      "lowReliability": false
    },
    "households": 3996,
    "pctNoVehicle": {
      "value": 3,
      "moe": 1.6,
      "lowReliability": true
    },
    "pctThreePlusVehicles": {
      "value": 32.5,
      "moe": 6.6,
      "lowReliability": false
    },
    "medianHouseholdIncome": {
      "value": 162188,
      "moe": 24319
    },
    "medianAge": {
      "value": 46.6,
      "moe": 2.6
    }
  },
  "benchmarks": {
    "county": {
      "workers16plus": 766432,
      "commutersNotWorkingFromHome": 674118,
      "meanTravelMinutes": {
        "value": 31.1,
        "moe": 0.4,
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      "pct60MinPlus": {
        "value": 14.1,
        "moe": 0.4,
        "lowReliability": false
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      "pct90MinPlus": {
        "value": 6.5,
        "moe": 0.3,
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      "pctUnder15Min": {
        "value": 22.8,
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      "pctDroveAlone": {
        "value": 72.1,
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      "pctCarpooled": {
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      "pctPublicTransit": {
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      "pctCommuterRail": {
        "value": 3.2,
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      },
      "pctBus": {
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      "pctWalked": {
        "value": 1.4,
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      "pctBicycle": {
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      "pctWorkedFromHome": {
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      "pctLeaveBefore6am": {
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      "pctLeaveBefore7am": {
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      "households": 512565,
      "pctNoVehicle": {
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      "pctThreePlusVehicles": {
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      "medianHouseholdIncome": {
        "value": 130686,
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      "medianAge": {
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    },
    "state": {
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      "meanTravelMinutes": {
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      "pct60MinPlus": {
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      "pct90MinPlus": {
        "value": 5.3,
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      "pctUnder15Min": {
        "value": 20.5,
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      "pctDroveAlone": {
        "value": 48.8,
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      "pctCarpooled": {
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      "pctCommuterRail": {
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      "pctBicycle": {
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      "pctWorkedFromHome": {
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      "pctLeaveBefore7am": {
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      "pctNoVehicle": {
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        "value": 11.8,
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      "medianHouseholdIncome": {
        "value": 85974,
        "moe": 402
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        "value": 39.8,
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    },
    "nation": {
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      "meanTravelMinutes": {
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      "pct60MinPlus": {
        "value": 8.6,
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      "pct90MinPlus": {
        "value": 2.7,
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      "pctUnder15Min": {
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      "pctDroveAlone": {
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      "pctCarpooled": {
        "value": 8.5,
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      "pctPublicTransit": {
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      "pctCommuterRail": {
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      "pctBicycle": {
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      "pctWorkedFromHome": {
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        "value": 21.9,
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    }
  },
  "research": {
    "researchedAt": "2026-09-17",
    "identity": {
      "officialName": "Mount Sinai",
      "placeType": "hamlet and census-designated place",
      "parentTown": "Town of Brookhaven",
      "alsoIn": [],
      "formerNames": [
        {
          "name": "Old Man's (also written Old Mans / Ould Mans)",
          "note": "Name used from the 1664 land purchase until 1841-1842, when the community was renamed Mount Sinai.",
          "src": [
            1,
            2
          ]
        },
        {
          "name": "Nonowatuc",
          "note": "Name used by the area's Native American population roughly 5,500 years ago, per the Mount Sinai Civic Association, meaning \"the stream that dries up.\"",
          "src": [
            2
          ]
        }
      ],
      "nameOrigin": {
        "text": "According to the Mount Sinai School District's own history, the community was renamed from Old Man's after its first postmaster, Charles Phillips, is said to have chosen a new name by closing his eyes and pointing a knitting needle at a page of his Bible; the nearest name, Mount Sinai, replaced Old Man's in 1841-1842.",
        "src": [
          1
        ]
      },
      "founded": {
        "text": "The Mount Sinai Civic Association dates the community's official establishment to 1664, when Native Americans sold the land to the Town of Brookhaven, under the name Old Man's.",
        "src": [
          2
        ]
      },
      "incorporated": null,
      "gnisId": null,
      "wikidataId": null
    },
    "quickFacts": [
      {
        "label": "Legal status",
        "value": "Unincorporated hamlet of the Town of Brookhaven, Suffolk County, tabulated by the Census Bureau as the Mount Sinai CDP",
        "src": [
          3
        ]
      },
      {
        "label": "Former name",
        "value": "Old Man's (until 1841-1842)",
        "src": [
          1,
          2
        ]
      },
      {
        "label": "School district",
        "value": "Mount Sinai School District, 118 North Country Road",
        "src": [
          4
        ]
      },
      {
        "label": "Policing",
        "value": "Suffolk County Police Department, 6th Precinct (400 Middle Country Road, Selden)",
        "src": [
          5
        ]
      },
      {
        "label": "Prior written notice law",
        "value": "Town of Brookhaven Code Chapter 84, \"Notice of Defective or Dangerous Conditions,\" adopted June 16, 1987 by Local Law No. 7-1987",
        "src": [
          6
        ]
      },
      {
        "label": "Harbor",
        "value": "Mount Sinai Harbor, about 455 acres, predominantly salt marsh, mudflats and open water",
        "src": [
          2
        ]
      }
    ],
    "timeline": [
      {
        "date": "1664",
        "label": "Land purchased",
        "text": "Native Americans sold the land encompassing present-day Mount Sinai to the Town of Brookhaven; the community was known as Old Man's.",
        "src": [
          2
        ]
      },
      {
        "date": "1777",
        "label": "Revolutionary War raid",
        "text": "A patriot raiding party landed at Cedar Beach and crossed Long Island to the Manor of St. George in Shirley, where they burned British supplies -- an action the Tallmadge Historical Trail commemorates.",
        "src": [
          2
        ]
      },
      {
        "date": "1840",
        "label": "Post office sought",
        "text": "Residents of Old Man's applied for a post office; the Mount Sinai School District's history says \"Old Mans was not considered a proper name\" for postal purposes, prompting a search for a replacement.",
        "src": [
          1
        ]
      },
      {
        "date": "1841",
        "label": "Renamed Mount Sinai",
        "text": "The community was renamed Mount Sinai after first postmaster Charles Phillips is said to have chosen the name at random from his Bible; residents have used the name since 1841-1842.",
        "src": [
          1
        ]
      },
      {
        "date": "1895",
        "label": "Rail line opens",
        "text": "The Long Island Rail Road's Port Jefferson Line began running through Mount Sinai, bringing visitors to summer cottages on the beach.",
        "src": [
          2
        ]
      },
      {
        "date": "1939",
        "label": "Rail line closes",
        "text": "The LIRR line through Mount Sinai stopped running.",
        "src": [
          2
        ]
      },
      {
        "date": "1987-06-16",
        "label": "Prior-notice law adopted",
        "text": "The Brookhaven Town Board adopted Local Law No. 7-1987, the Town Code's current \"Notice of Defective or Dangerous Conditions\" chapter.",
        "src": [
          6
        ]
      }
    ],
    "sections": [
      {
        "id": "history",
        "heading": "History",
        "paragraphs": [
          "Mount Sinai is an unincorporated hamlet of the Town of Brookhaven, tabulated by the Census Bureau as its own census-designated place.[3] The Mount Sinai Civic Association's history dates organized settlement to 1664, when Native Americans sold the land to the Town of Brookhaven; the resulting community was called Old Man's (also written Old Mans or Ould Mans).[2] The Civic Association separately notes that Native people had lived around the harbor roughly 5,500 years earlier, when the area was known as Nonowatuc, or \"the stream that dries up,\" and that the harbor's south shore was one of the most densely populated sites in the Long Island Sound region in that era.[2]",
          "The Mount Sinai School District's own history recounts a popular legend for the Old Man's name: a swindle involving Major John Gotherson, \"an elderly Englishman,\" and John Scott, described as \"a notorious wheeler-dealer of the 1600s,\" who allegedly took payment for land he could not deliver, after which \"local people reportedly started to refer to the land as 'the Old Mans' lands.'\"[1] In 1840, residents of Old Man's applied for a post office, but, in the school district's words, \"Old Mans was not considered a proper name;\" after a brief, rejected switch to \"Mt. Vernon,\" the community's first postmaster, Charles Phillips, is said to have settled the new name by closing his eyes and pointing a knitting needle at a page of his Bible, landing on \"Mt Sinai,\" which has been in use since 1841-1842.[1]",
          "During the American Revolution, a patriot raiding party landed at Cedar Beach in Mount Sinai and crossed Long Island to the Manor of St. George in Shirley, burning British supplies there; the route is commemorated today as the Tallmadge Historical Trail, named for Setauket-based Continental intelligence officer Benjamin Tallmadge.[2] The Long Island Rail Road's Port Jefferson Line ran through Mount Sinai from 1895 until 1939, carrying visitors to summer cottages on the beach before the line closed.[2]"
        ]
      },
      {
        "id": "roads",
        "heading": "How the roads got here",
        "paragraphs": [
          "New York State Route 25A (North Country Road) runs through Mount Sinai; the Mount Sinai School District's own address, 118 North Country Road, sits directly on this state highway.[4] A separate county road, CR 83, is named the \"Patchogue-Mount Sinai Road\" in NYSDOT's own official touring-route records, tying the hamlet by name to a county-maintained road running south toward Patchogue.[7]"
        ]
      },
      {
        "id": "law",
        "heading": "Law and legal history",
        "paragraphs": [
          "As an unincorporated hamlet, Mount Sinai falls under the Town of Brookhaven's prior-written-notice law, Chapter 84 of the Town Code, adopted June 16, 1987 by Local Law No. 7-1987, which bars a civil action against the Town over a defective road, sidewalk or snow/ice condition unless written notice was first given to the Town Clerk or Superintendent of Highways and the Town failed to act within a reasonable time.[6]",
          "The Town of Brookhaven maintains no police department of its own; the Suffolk County Police Department's 6th Precinct, headquartered at 400 Middle Country Road in Selden, covers the hamlets and incorporated villages of the northern Town of Brookhaven, including Mount Sinai.[5]"
        ]
      },
      {
        "id": "government",
        "heading": "Government, courts and policing",
        "paragraphs": [
          "Mount Sinai has no government of its own; it is an unincorporated hamlet of the Town of Brookhaven.[3][6] Public schools come from the Mount Sinai School District, at 118 North Country Road, which operates Mount Sinai Elementary School, Mount Sinai Middle School and Mount Sinai High School.[4] Policing is provided by the Suffolk County Police Department's 6th Precinct.[5]"
        ]
      },
      {
        "id": "transit",
        "heading": "Railroad and transit",
        "paragraphs": [
          "A branch of the Long Island Rail Road's Port Jefferson Line ran through Mount Sinai from 1895 to 1939, carrying beachgoing visitors to summer cottages before the line was discontinued; unlike the still-operating Port Jefferson Branch through neighboring communities, this line did not survive into the present day.[2]"
        ]
      }
    ],
    "legalCases": [],
    "landmarks": [],
    "notableFacts": [
      {
        "text": "Mount Sinai was called \"Old Man's\" from its 1664 founding until 1841-1842, when it was renamed after a postmaster reportedly pointed a knitting needle at random into his Bible.",
        "src": [
          1,
          2
        ]
      },
      {
        "text": "About 5,500 years ago, the area around Mount Sinai Harbor was known to its Native American inhabitants as Nonowatuc, \"the stream that dries up.\"",
        "src": [
          2
        ]
      },
      {
        "text": "A Revolutionary War raiding party that landed at Mount Sinai's Cedar Beach and burned British supplies at Shirley's Manor of St. George is commemorated today as the Tallmadge Historical Trail.",
        "src": [
          2
        ]
      },
      {
        "text": "A Long Island Rail Road branch ran through Mount Sinai from 1895 to 1939, carrying visitors to beachfront summer cottages, before the line was discontinued.",
        "src": [
          2
        ]
      }
    ],
    "sources": [
      {
        "id": 1,
        "title": "Mount Sinai History (school history page)",
        "publisher": "Mount Sinai School District",
        "url": "https://www.mtsinai.k12.ny.us/43349_3",
        "year": "n.d.",
        "type": "government"
      },
      {
        "id": 2,
        "title": "About / Our History",
        "publisher": "Mount Sinai Civic Association",
        "url": "https://mountsinaicivic.org/about/",
        "year": "2026",
        "type": "institution"
      },
      {
        "id": 3,
        "title": "2020 Gazetteer Files: Places, New York (2020_gaz_place_36.txt)",
        "publisher": "U.S. Census Bureau",
        "url": "https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2020_Gazetteer/2020_gaz_place_36.txt",
        "year": "2020",
        "type": "government"
      },
      {
        "id": 4,
        "title": "Mount Sinai School District (home page)",
        "publisher": "Mount Sinai School District",
        "url": "https://www.mtsinai.k12.ny.us/",
        "year": "2026",
        "type": "government"
      },
      {
        "id": 5,
        "title": "Sixth Precinct",
        "publisher": "Suffolk County Police Department",
        "url": "https://www.suffolkpd.org/Precincts-and-Specialized-Units/Precincts/Sixth-Precinct",
        "year": "2026",
        "type": "government"
      },
      {
        "id": 6,
        "title": "Town of Brookhaven Code, Chapter 84, Notice of Defective or Dangerous Conditions",
        "publisher": "Town of Brookhaven / General Code (ecode360)",
        "url": "https://ecode360.com/8596414",
        "year": "2026",
        "type": "government"
      },
      {
        "id": 7,
        "title": "Official Description of Highway Touring Routes... in New York State (CR 83 entry)",
        "publisher": "New York State Department of Transportation, Office of Traffic Safety & Mobility",
        "url": "https://www.dot.ny.gov/divisions/operating/oom/transportation-systems/repository/2017%20tour-bk.pdf",
        "year": "2017",
        "type": "government"
      }
    ]
  },
  "dataSources": {
    "census2020": {
      "name": "U.S. Census Bureau, TIGERweb — 2020 Census tabulation geography (POP100, HU100, AREALAND)",
      "url": "https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/tigerWMS_Census2020/MapServer",
      "retrieved": "2026-09-17"
    },
    "acs": {
      "name": "U.S. Census Bureau, American Community Survey 2020–2024 5-Year Estimates, tables B08303, B08013, B08301, B08302, B08201, B19013, B01002",
      "url": "https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/",
      "period": "2020–2024",
      "retrieved": "2026-09-17",
      "note": "Survey estimates with 90% margins of error. lowReliability = coefficient of variation above 30%."
    },
    "fars": {
      "name": "National Highway Traffic Safety Administration, Fatality Analysis Reporting System (FARS), 2010–2024 national files",
      "url": "https://www.nhtsa.gov/file-downloads?p=nhtsa/downloads/FARS/",
      "retrieved": "2026-09-17",
      "preliminaryYears": [
        2024
      ],
      "note": "Crashes on public trafficways in which a person died within 30 days. No personal identifiers. Placed by reported coordinates into 2020 Census boundaries."
    },
    "nys": {
      "name": "New York State Department of Motor Vehicles, Motor Vehicle Crashes — Case Information: Four Year Window",
      "url": "https://data.ny.gov/Transportation/Motor-Vehicle-Crashes-Case-Information-Four-Year-W/e8ky-4vqe",
      "period": "2021–2024",
      "retrieved": "2026-09-17",
      "note": "Police-reported crashes coded to a town, city or village by the reporting agency. Hamlets are not coded; hamlet pages show the parent town."
    }
  }
}