County · code 36005
Bronx CountyNew York
Bronx County is a county in New York, formed in 1912 with its seat in the Bronx.
- Founded1912
- Named forJonas Bronck
- Land area42 sq mi + 15 sq mi water
- Population1,472,654 2020 Census
- Parcels mapped89,229 checked 15 October 2026
Where it is
Bronx on the map of New York
New York has 62 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Formed in 1912 from New York County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Bronx County was created from New York on April 19, 1912. The county was named after Jonas Bronck. A small area was gained from Westchester in 1917, and South Brother Island was gained from Queens in 1964.
- 1912Bronx County created Bronx created from New York. · N.Y. Laws 1912, 135th sess., ch. 548, sec. 1/p. 1352
- 1917Gained territory Bronx gained small area from Westchester. · N.Y. Laws 1917, 140th sess., ch. 664, sec. 1/p. 2022
- 1950Boundary clarified Boundary between Bronx and Westchester was redefined (no change).with Westchesterno change· N.Y. Laws 1950, 173d sess., ch. 650/p. 1508
- 1964Gained territory Bronx gained South Brother Island from Queens. · N.Y. Laws 1964, 187th sess., ch. 578/p. 1606
Land and parcels
What the maps cover in Bronx
Who publishes each layer, how good it is, and when we last checked.
-
Parcels Good enough
Lot lines and tax-map numbers for 89,229 parcels from New York State Geographic Information Systems (GIS) Clearinghouse. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 25 September 2026 · checked 15 October 2026 -
Address points Official
One point per address, 105,519 in all from NYS Office of Information Technology Services (ITS), Geospatial Services / GIS Program Office (AGOL org 'ShareGIS NY', owner NYSGIS_GPO).
edited 25 September 2026 · checked 14 October 2026 -
Buildings Reference
Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026
- Official
- from the office that keeps the record
- Good enough
- a reliable statewide or national copy
- Fallback
- a guide only; check the official record
- Missing
- nothing public found yet
People and land
Bronx by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
Rules and offices
Bronx County's official site
We have found the county's site but not its offices yet; start there.
County government
- County government
The official website of Bronx County.
See your own lot on these maps
Open Bronx County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.
Questions
Common questions about Bronx County
- When was Bronx County founded?
- Bronx County was founded in 1912, formed from New York County, and named after Jonas Bronck.
- Is there an online parcel map for Bronx County?
- Yes. New York State Geographic Information Systems (GIS) Clearinghouse publishes a parcel map of 89,229 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Bronx County's boundary or name changed?
- Bronx County was created in 1912 from New York County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Queens County and Westchester County.
- Is my lot in a flood zone?
- We do not have flood maps for Bronx County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby