McClain County, OK zoning map, flood zone and property lines by address
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Towns in McClain County: Newcastle, Blanchard, Purcell.
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 McClain County has 36 FIRM panels, the newest effective November 2007; 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 McClain 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 McClain lot shows the same lines the county assessor draws. McClain County covers about 365,260 acres of land and 6,105 acres of water.
Mapped lines are approximate. The McClain County assessor keeps the parcel record (McClain County website); a licensed surveyor sets the true corners.
Zoning
McClain County zones its unincorporated land, and Newcastle, Blanchard, Purcell each zone the land inside their 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 McClain 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. McClain County is soil survey area OK087, McClain County, Oklahoma, last updated August 2026, on Web Soil Survey.
A new or changed septic system in McClain County needs an Authorization to Construct from the Oklahoma Department of Environmental Quality, through the local DEQ environmental specialist for McClain County.
Setbacks
Setbacks in McClain 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 Newcastle, Blanchard, Purcell for land inside their limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a McClain lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in McClain 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 McClain County has 36 panels, the newest effective November 2007. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in McClain County?
Open the Oklahoma map, type the address, and the parcel outline from the McClain 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 McClain County?
Zoning in McClain County is set by the county for unincorporated land and by each city (such as Newcastle, Blanchard) 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 McClain 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 McClain 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 McClain County?
Yes. A new or changed septic system in McClain County needs an Authorization to Construct from the Oklahoma Department of Environmental Quality, through the local DEQ environmental specialist for McClain County. ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area OK087 (McClain County, Oklahoma).
What can I build on 5 acres in McClain County?
Zoning in McClain County is set by the county for unincorporated land and each city inside its own limits (such as Newcastle, Blanchard). 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 McClain County website.
What are the residential setbacks in McClain County (2026)?
Setbacks in McClain 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 McClain County website.
Next to McClain County: Cleveland County, Garvin County, Grady County, Pontotoc County, Pottawatomie County.
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