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Thornwood, New York

39 topographic sheets cover this place, the earliest surveyed in 1892 and the latest in 1986. It stands in Mount Pleasant town. It lies in ZIP code area 10594. It stands on Nanny Hagen Brook. The Survey maps it on the White Plains quadrangle. 3,960 people lived here at the 2020 count. It stands 269 feet above sea level.

Thornwood within Westchester County

Then and now

1892 to 1986

The same ground, surveyed 94 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

Topographic sheet of Thornwood, surveyed 1986
Topographic sheet of Thornwood, surveyed 1892

On record in Thornwood

Buildings and businesses the archive holds for this place. Each opens its own page, with the source record it came from.

On the National Register within a mile 1 record

The National Register names another town for these. They stand within one mile of this settlement's coordinate.

Population over time

2 figures

Thornwood grew from 3,759 to 3,960 between 2010 and 2020. These are the recorded population figures Wikidata holds for this place, reached through the Geographic Names Information System number this page is keyed on rather than by name, so they belong to this place and not to another of the same name. Most are census counts, but not all are: an early figure may be a founding or settlement estimate, and an estimate published within five years of a census is left out. The change column is computed, and is left blank where more than 20 years separate a figure from the one before it, because a gap that long is not a change between two counts.

YearPeople Change
20103,759
20203,960+201 (+5%)

Topographic sheets covering this place

15 surveys from 39 printed sheets

Matched by testing this settlement's coordinate against the published boundary of every sheet in the United States Geological Survey's historical collection. Each opens the scanned sheet at the Survey.

Fires near this place

487 since 2000

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 487 fires within 5 miles of Thornwood between 2000 and 2020, burning about 414 acres in total. 75 started naturally. 27 were recorded as arson. Distance is straight-line from the map coordinates, so a fire counted here may appear on a neighbouring settlement's page as well.

Reported cause Fires
Missing data/not specified/undetermined227
Natural75
Recreation and ceremony46
Debris and open burning34
Smoking30
Arson/incendiarism27
Equipment and vehicle use24
Power generation/transmission/distribution19
Misuse of fire by a minor5

The most recent of them, most recent first, with the day each was reported and the service that recorded it.

DateCause SizeReported by Name on the report
8 September 2010Debris and open burningunder an acreFire Department of New Yorknot named
8 September 2007Missing data/not specified/undeterminedunder an acreFire Department of New Yorknot named
7 September 2007Missing data/not specified/undeterminedunder an acreFire Department of New Yorknot named
5 September 2014Missing data/not specified/undeterminedunder an acreFire Department of New Yorknot named
5 September 2008Power generation/transmission/distributionunder an acreFire Department of New Yorknot named
4 September 2016Smokingunder an acreFire Department of New YorkN/A
4 September 2014Missing data/not specified/undeterminedunder an acreFire Department of New Yorknot named
4 September 2013Missing data/not specified/undeterminedunder an acreFire Department of New YorkN/A

Settlements close enough to share some of these fires:

Every fire recorded in Westchester County

Mines and quarries near this place

10 of 11 shown

Regional context, not property-specific evidence. The federal mineral resources record lists 11 workings within 5 miles of Thornwood: 7 past producers, 2 occurrences, 1 plant, 1 producer. 2 still produce. What was taken out: Iron, Lead, Granite, Silver. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.

Where SiteCommodity StatusRecorded
Armonk PlantPeatPast ProducerPeat
Ossining AreaVanadium, LeadOccurrenceVanadinite
Sing Sing Ag MineLead, Silver, Iron, CopperPast Producer
Sing Sing Silver MineLead, Copper, Silver, Iron, Chromium, Phosphorus-PhosphatesPast ProducerChalcocite, Chalcopyrite, Galena, Malachite, Silver
Sparta Copper DepositCopper, LeadOccurrence
(Facility) Chester Metals Division RefinerySilverPlant
Lake Street Granite MineGraniteProducer
Lake Street Granite QuarryGranitePast ProducerGranite
Ackerman's Limonite MineIronPast ProducerLimonite
Ackerman's Limonite MineIronPast ProducerResidual

Every working recorded in Westchester County

Storms near this place

17 since 2007

Regional context, not property-specific evidence. The National Weather Service names Thornwood in 17 storm reports between 2007 and 2021: 11 flash flood, 3 thunderstorm wind, 2 flood, 1 hail. No death or injury is recorded in these reports. Each account below is quoted exactly as the forecast office filed it, from the NOAA Storm Events Database, and each date opens the federal record of that event.

WhenEvent Place namedHarm What the report says
July 2011Thunderstorm WindThornwood$7,500Multiple trees were reported down along the Saw Mill River Parkway from near Exit 29 to near Exit 32.
May 2018Thunderstorm WindThornwood$5,000Reports of numerous trees down around town.
August 2009Thunderstorm WindThornwood$1,500Wheeler Avenue in Pleasantville was closed due to a downed tree.
September 2021Flash FloodThornwood-All lanes were closed northbound due to flooding on the Saw Mill River Parkway between Marble Avenue (Exit 17) and Manville Road in Pleasantville.
August 2021Flash FloodThornwood-The Saw Mill River Parkway was closed in both directions due to flooding at Manville Road in Pleasantville.
July 2019Flash FloodThornwood-All northbound lanes closed due to flooding on the Saw Mill River Parkway between Marble Avenue (Exit 27) and Bedford Road in Mount Pleasant.
July 2019Flash FloodThornwood-The Saw Mill River Parkway was closed northbound at Marble Avenue (Exit 27) and southbound at Manville Road in Pleasantville due to flooding.
October 2018Flash FloodThornwood-All lanes were closed in both directions on the Saw Mill River Parkway in Mount Pleasant at Exit 27 (Marble Avenue) due to flooding.
August 2017Flash FloodThornwood-The northbound Saw Mill River Parkway was closed at Exit 27 in Sherman Park due to flooding.
August 2017HailThornwood-Golfball size hail was reported in Thornwood by a trained spotter.
July 2017Flash FloodThornwood-The Saw Mill Parkway was closed northbound at Marble Avenue in Pleasantville.
December 2012Flash FloodThornwood-In Pleasantville, the Saw Mill River Pkwy. was closed in both directions between the Taconic State Pkwy. and exit 29 (Manville Rd.) due to flooding.
December 2011FloodThornwood-The Saw Mill River Pkwy. was closed between Marble Ave. and Manville Rd. due to flooding with many vehicles stranded in high water. Another vehicle was also stranded in high water on the Saw Mill River Pkwy. in Mount Pleasant.
March 2010FloodThornwood-The Saw Mill River Pkwy. was closed in both directions between Manville Rd. and Marble Ave. in Pleasantville due to flooding.
June 2009Flash FloodThornwood-Both directions of the Bronx River Pkwy. from the Sprain Brook Pkwy. in Yonkers to Route 119/Main St. in White Plains were closed due to flooding. One car was submerged in high water (approximately 3 to 4 ft high) on the parkway in Bronxville. Both directions of the Hutchinson River Pkwy. between Boston Post Rd. and the Cross County Pkwy. and the Saw Mill River Pkwy from Exit 27, Marble Ave. to Exit 30, Grand Street were also closed due to flooding. Flooding also closed the Cross County Pkwy. at the Exit 9 ramp to the Hutchinson River Pkwy.
September 2008Flash FloodThornwood-The Saw Mill River Pkwy. was closed between exits 25 and 27 in Hawthorne due to flooding.
October 2007Flash FloodThornwood-Flash flooding was reported on Saw Mill Parkway in Thornwood and the Hutchinson River Pkwy in Mount Vernon. The Automated Weather Station at Port Chester measured 2.37 inches of rain.

Every storm recorded in Westchester County

Nearest settlements

The eight closest, with where each one stands in the county. Distances are straight-line, computed from the Geographic Names Information System coordinates.

Map PlaceDistance Sheets
Sherman Park0.3 miles40
Pleasantville1.0 miles40
Hawthorne1.4 miles39
Graham1.6 miles39
Mount Pleasant2.0 miles39
Buckhout Corners2.2 miles40
Chappaqua2.6 miles40
Briarcliff Manor2.8 miles40

Elsewhere

Matched on this settlement's Geographic Names Information System number rather than its name, so it cannot be a different place of the same name in another state.

Wikipedia article on ThornwoodAn encyclopaedic summary. Its text is share-alike, so it is linked here rather than copied.
Wikidata item Q3461389The structured record the population and elevation above come from. Public domain (CC0).

Provenance

This settlement is recorded in the Geographic Names Information System as feature 967439. The sheet list is computed by point-in-boundary test against the United States Geological Survey's historical topographic inventory. Both are works of the United States government and carry no copyright under 17 U.S.C. 105.

Wildfire. Short, Karen C. 2022. Spatial wildfire occurrence data for the United States, 1992-2020 [FPA_FOD_20221014]. 6th Edition. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2013-0009.6 Collected with United States Government funding and usable without additional permissions or fees.

Mines and quarries. USGS Mineral Resources Data System (MRDS) https://mrdata.usgs.gov/mrds/ A work of the United States government, no copyright under 17 U.S.C. 105.

Storms. NOAA National Centers for Environmental Information, Storm Events Database https://www.ncei.noaa.gov/stormevents/ A work of the United States government, no copyright under 17 U.S.C. 105. Narratives are quoted verbatim from the National Weather Service report and are not edited or summarised.