Bronx County, NY: flood zone, zoning and property lines by address
Free, no account. Or open the New York map and tap a lot.
Property lines
The parcel outline, parcel number and mapped size come from the New York State Tax Parcels layer (NYS GIS Program Office, from each county's tax maps), so a Bronx lot shows the same lines the Real Property Tax Services office draws. Bronx County covers about 27,009 acres of land and 9,708 acres of water.
Mapped lines are approximate. The Bronx County Real Property Tax Services office keeps the parcel record (Bronx County website); every county's office is on the state's county directors of Real Property Tax Services page; a licensed surveyor sets the true corners.
Zoning
In New York zoning is set by each town, village and city, not by the county. ParcelSheet shows the use code on the lot's parcel record and the municipality it sits in; the town, village or city zoning office has the district, the uses it allows and the lot size it needs. The Bronx County website lists the county's municipalities.
ADU and guest houses
New York's zoning enabling laws (Town Law 261, Village Law 7-700 and General City Law 20) lets each town, village and city allow an accessory dwelling unit on a lot with a house. Whether a Bronx lot can add one depends on its district; the town, village or city zoning office has the rule. ParcelSheet shows the mapped lot size and the ground's slope, the first two things the question turns on.
Septic and soil
ParcelSheet reads the USDA soil survey at the lot: the soil's name, its septic absorption rating and whether it is prime farmland. Bronx County is soil survey area NY005, Bronx County, New York, last updated August 2026, on Web Soil Survey.
A new or changed septic system in Bronx County needs a permit from the Bronx County health department, or the NYS Department of Health district office where the county has none, which tests the soil on the lot itself.
Setbacks
Setbacks in Bronx County come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; the town, village or city zoning office gives them for the lot's district.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Bronx lot and the Forest Service wildfire hazard rating at it.
Questions
How do I find property lines in Bronx County?
Open the New York map, type the address, and the parcel outline from the county Real Property Tax Services office shows on the map with its parcel number and mapped size. Mapped lines are approximate; only a licensed surveyor sets the true corners.
What is my property zoned in Bronx County?
Zoning in Bronx County is set by each town, village and city, not by the county. ParcelSheet shows the use code on the parcel record and names the municipality; the town, village or city zoning office has the final word.
Can I build an ADU in Bronx County?
New York's zoning enabling laws (Town Law 261, Village Law 7-700 and General City Law 20) lets each town, village and city allow an accessory dwelling unit, and each sets its own rules. In Bronx County ask the town, village or city zoning office for the lot's district first; ParcelSheet shows the lot size as mapped so you can see the room you have.
Do I need a septic permit in Bronx County?
Yes. A new or changed septic system in Bronx County needs a permit from the Bronx County health department, or the NYS Department of Health district office where the county has none. ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area NY005 (Bronx County, New York).
Next to Bronx County: New York County, Queens County, Westchester County.
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