Northumberland 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 Northumberland County: Heathsville.
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 Northumberland County has 53 FIRM panels, the newest effective December 2021; coastal V zones, where waves add to the flood, are mapped along its shore.
The official panel and any Letter of Map Amendment are at FEMA's Map Service Center. An elevation certificate for a Northumberland 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 a Northumberland lot shows the same lines the real estate assessor draws. Northumberland County covers about 122,517 acres of land and 60,265 acres of water.
Mapped lines are approximate. The Northumberland County real estate assessor keeps the parcel record (Northumberland County website); a licensed surveyor sets the true corners.
Zoning
Northumberland 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 a Northumberland 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. Northumberland County is soil survey area VA133, Northumberland and Lancaster Counties, Virginia, last updated August 2026, on Web Soil Survey.
A new or changed septic system in Northumberland County needs a permit from the Northumberland County local health department (Virginia Department of Health).
Setbacks
Setbacks in Northumberland 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
- Storm surge. Northumberland County has coastal V zones on its FEMA map, so storm surge reaches its shore. The county's evacuation zones are on its emergency management site; ParcelSheet shows the FEMA zone and the 3 ft sea level rise map at the lot.
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Northumberland lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Northumberland 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 Northumberland County has 53 panels, the newest effective December 2021. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Northumberland County?
Open the Virginia map, type the address, and the parcel outline from the Northumberland 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 Northumberland County?
Zoning in Northumberland 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 Northumberland 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 Northumberland 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 Northumberland County?
Yes. A new or changed septic system in Northumberland County needs a permit from the Northumberland County local health department (Virginia Department of Health). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area VA133 (Northumberland and Lancaster Counties, Virginia).
What can I build on 5 acres in Northumberland County?
Zoning in Northumberland 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 Northumberland County website.
What are the residential setbacks in Northumberland County (2026)?
Setbacks in Northumberland 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 Northumberland County website.
Next to Northumberland County: Accomack County, Lancaster County, Richmond County, Westmoreland County.
The Virginia map · All Virginia counties · Flood zones explained · FIRM panels and LOMAs · All 50 states