Mobile County, AL zoning map, flood zone and property lines by address
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Towns in Mobile County: Mobile, Prichard, Tillmans Corner.
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 Mobile County has 307 FIRM panels, the newest effective June 2020; 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 Mobile 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 Alabama county parcel layers (each county publishes its own), so a Mobile lot shows the same lines the county revenue commissioner or tax assessor draws. Mobile County covers about 786,805 acres of land and 265,389 acres of water.
Mapped lines are approximate. The Mobile County revenue commissioner or tax assessor keeps the parcel record (Mobile County website); a licensed surveyor sets the true corners.
Zoning
In Alabama zoning is set by the city, or the county only where a local act of the legislature lets it zone: in Mobile County, Mobile, Prichard each zone the land inside their limits. ParcelSheet shows the use code on the lot's parcel record and the municipality it sits in; the city or county planning office has the district, the uses it allows and the lot size it needs. The Mobile County website lists the county's municipalities.
ADU and guest houses
Under Alabama's municipal zoning law (Code of Alabama Title 11, Chapter 52, Article 4), the city, or the county only where a local act of the legislature lets it zone can allow an accessory dwelling unit on a lot with a house. Whether a Mobile lot can add one depends on its district; the city or 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. Mobile County is soil survey area AL097, Mobile County, Alabama, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Mobile County needs a permit from the Mobile County health department (Alabama Department of Public Health soil and onsite sewage program).
Setbacks
Setbacks in Mobile County come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; the city or county planning office gives them for the lot's district, and Mobile and Prichard for land inside their limits.
Hazards that apply
- Storm surge. Mobile 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 Mobile lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Mobile 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 Mobile County has 307 panels, the newest effective June 2020. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Mobile County?
Open the Alabama map, type the address, and the parcel outline from the Mobile County revenue commissioner or tax 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 Mobile County?
Zoning in Mobile County is set by the city, or the county only where a local act of the legislature lets it zone (such as Mobile, Prichard). ParcelSheet shows the use code on the parcel record and names the municipality; the city or county planning office has the final word.
Can I build an ADU in Mobile County?
Under Alabama's municipal zoning law (Code of Alabama Title 11, Chapter 52, Article 4), the city, or the county only where a local act of the legislature lets it zone can allow an accessory dwelling unit, and each sets its own rules. In Mobile County ask the city or county planning 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 Mobile County?
Yes. A new or changed septic system in Mobile County needs a permit from the Mobile County health department (Alabama Department of Public Health soil and onsite sewage program). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area AL097 (Mobile County, Alabama).
What can I build on 5 acres in Mobile County?
Zoning in Mobile County is set by the city, or the county only where a local act of the legislature lets it zone (such as Mobile, Prichard). 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 city or county planning office has the district and its rules. See the Mobile County website.
What are the residential setbacks in Mobile County (2026)?
Setbacks in Mobile County come from the zoning code of the municipality the lot sits in: 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 city or county planning office gives them for the district. See the Mobile County website.
Next to Mobile County: Baldwin County, Washington County.
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