Arlington County, VA zoning map, flood zone and property lines by address
Free, no account. Or open the Virginia map and tap a lot.
Towns in Arlington County: Arlington.
Flood zone by address
ParcelSheet reads FEMA's National Flood Hazard Layer at the lot: the zone, whether it is a high risk area where lenders ask for flood insurance, and the base flood elevation where FEMA lists one. FEMA's countywide study for Arlington County has 14 FIRM panels, the newest effective November 2023; no coastal V zones are mapped in it.
The official panel and any Letter of Map Amendment are at FEMA's Map Service Center. An elevation certificate for an Arlington house comes from a licensed surveyor and is often on file with the county or city building office.
Property lines
The parcel outline, parcel number and mapped size come from the Virginia statewide parcel layer (Virginia Geographic Information Network, from each locality), so an Arlington lot shows the same lines the real estate assessor draws. Arlington County covers about 16,638 acres of land and 68 acres of water.
Mapped lines are approximate. The Arlington County real estate assessor keeps the parcel record (Arlington County website); a licensed surveyor sets the true corners.
Zoning
Arlington County zones its unincorporated land. ParcelSheet shows the use the real estate assessor lists for the lot and links the county planning office for the district, the uses it allows and the lot size it needs.
ADU and guest houses
Under Virginia's zoning law (Code of Virginia Title 15.2, Chapter 22), local governments can allow an accessory dwelling unit on a lot with a house. Whether an Arlington lot can add one depends on its district; the county planning 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. Arlington County is soil survey area VA013, Arlington County, Virginia, last updated August 2026, on Web Soil Survey.
A new or changed septic system in Arlington County needs a permit from the Arlington County local health department (Virginia Department of Health).
Setbacks
Setbacks in Arlington County come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; the county zoning office gives them for the lot's district.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near an Arlington lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Arlington County?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA's countywide flood map for Arlington County has 14 panels, the newest effective November 2023. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Arlington County?
Open the Virginia map, type the address, and the parcel outline from the Arlington County real estate assessor 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 Arlington County?
Zoning in Arlington County is set by the county for unincorporated land and by each city inside its own limits. ParcelSheet shows the use code the real estate assessor lists and links the office that sets the zoning; the planning office has the final word.
Can I build an ADU in Arlington County?
Under Virginia's zoning law (Code of Virginia Title 15.2, Chapter 22), counties and cities can allow an accessory dwelling unit, and each sets its own rules. In Arlington County ask the 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 Arlington County?
Yes. A new or changed septic system in Arlington County needs a permit from the Arlington County local health department (Virginia Department of Health). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area VA013 (Arlington County, Virginia).
What can I build on 5 acres in Arlington County?
Zoning in Arlington County is set by the county for unincorporated land and each city inside its own limits. The zoning district decides the uses, how many homes and the smallest lot it allows on 5 acres. ParcelSheet shows the lot size as mapped and the use code on the parcel record; the planning office has the district and its rules. See the Arlington County website.
What are the residential setbacks in Arlington County (2026)?
Setbacks in Arlington County come from the zoning code of the county, or of the city when the lot is inside city limits: the front, side and rear distances depend on the lot's district. ParcelSheet does not draw setback lines or give a number it did not read; the zoning office gives them for the district. See the Arlington County website.
Next to Arlington County: Fairfax County, Alexandria city, Falls Church city.
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