Grant County, OK zoning map, flood zone and property lines by address
Free, no account. Or open the Oklahoma map and tap a lot.
Towns in Grant County: Medford.
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 has 19 FIRM panels covering Grant County, the newest effective March 2025; 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 a Grant 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 Oklahoma county parcel layers (each county publishes its own), so a Grant lot shows the same lines the county assessor draws. Grant County covers about 640,474 acres of land and 1,740 acres of water.
Mapped lines are approximate. The Grant County assessor keeps the parcel record (Grant County website); a licensed surveyor sets the true corners.
Zoning
Grant County zones its unincorporated land, and Medford zones the land inside its limits. ParcelSheet shows the use the county assessor lists for the lot and links the county planning commission or the city planning office for the district, the uses it allows and the lot size it needs.
ADU and guest houses
Under Oklahoma's county planning and zoning laws (Oklahoma Statutes Title 19, sections 865.51 and following), local governments can allow an accessory dwelling unit on a lot with a house. Whether a Grant lot can add one depends on its district; the county planning commission or the city 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. Grant County is soil survey area OK053, Grant County, Oklahoma, last updated August 2026, on Web Soil Survey.
A new or changed septic system in Grant County needs an Authorization to Construct from the Oklahoma Department of Environmental Quality, through the local DEQ environmental specialist for Grant County.
Setbacks
Setbacks in Grant 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, and Medford for land inside its limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Grant lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Grant County?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA has 19 flood map panels covering Grant County, the newest effective March 2025. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Grant County?
Open the Oklahoma map, type the address, and the parcel outline from the Grant County 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 Grant County?
Zoning in Grant County is set by the county for unincorporated land and by each city (such as Medford) inside its own limits. ParcelSheet shows the use code the county assessor lists and links the office that sets the zoning; the planning office has the final word.
Can I build an ADU in Grant County?
Under Oklahoma's county planning and zoning laws (Oklahoma Statutes Title 19, sections 865.51 and following), counties and cities can allow an accessory dwelling unit, and each sets its own rules. In Grant 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 Grant County?
Yes. A new or changed septic system in Grant County needs an Authorization to Construct from the Oklahoma Department of Environmental Quality, through the local DEQ environmental specialist for Grant County. ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area OK053 (Grant County, Oklahoma).
What can I build on 5 acres in Grant County?
Zoning in Grant County is set by the county for unincorporated land and each city inside its own limits (such as Medford). 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 Grant County website.
What are the residential setbacks in Grant County (2026)?
Setbacks in Grant 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 Grant County website.
Next to Grant County: Alfalfa County, Garfield County, Kay County.
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