Frederick County, MD zoning map, flood zone and property lines by address
Free, no account. Or open the Maryland map and tap a lot.
Towns in Frederick County: Frederick, Ballenger Creek, Green Valley.
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 Frederick County has 224 FIRM panels, the newest effective August 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 a Frederick 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 Maryland Department of Planning, statewide parcel boundaries (MD iMAP), so a Frederick lot shows the same lines the state Department of Assessments and Taxation draws. Frederick County covers about 422,821 acres of land and 4,334 acres of water.
Mapped lines are approximate. The Maryland Department of Assessments and Taxation keeps the parcel record (Frederick County website); a licensed surveyor sets the true corners.
Zoning
Frederick County zones its unincorporated land, and Frederick zones the land inside its limits. ParcelSheet shows the use the state Department of Assessments and Taxation lists for the lot and links the county planning and zoning office for the district, the uses it allows and the lot size it needs.
ADU and guest houses
Under Maryland's Land Use Article (Annotated Code of Maryland, Land Use Title 4, Zoning), local governments can allow an accessory dwelling unit on a lot with a house. Whether a Frederick lot can add one depends on its district; the county planning and zoning 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. Frederick County is soil survey area MD021, Frederick County, Maryland, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Frederick County needs a permit from the Frederick County health department (under Maryland Department of the Environment onsite systems rules).
Setbacks
Setbacks in Frederick 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 Frederick for land inside its limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Frederick lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Frederick 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 Frederick County has 224 panels, the newest effective August 2023. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Frederick County?
Open the Maryland map, type the address, and the parcel outline from the Maryland Department of Assessments and Taxation 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 Frederick County?
Zoning in Frederick County is set by the county for unincorporated land and by each city (such as Frederick) inside its own limits. ParcelSheet shows the use code the state Department of Assessments and Taxation lists and links the office that sets the zoning; the planning office has the final word.
Can I build an ADU in Frederick County?
Under Maryland's Land Use Article (Annotated Code of Maryland, Land Use Title 4, Zoning), counties and cities can allow an accessory dwelling unit, and each sets its own rules. In Frederick 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 Frederick County?
Yes. A new or changed septic system in Frederick County needs a permit from the Frederick County health department (under Maryland Department of the Environment onsite systems rules). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area MD021 (Frederick County, Maryland).
What can I build on 5 acres in Frederick County?
Zoning in Frederick County is set by the county for unincorporated land and each city inside its own limits (such as Frederick). 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 Frederick County website.
What are the residential setbacks in Frederick County (2026)?
Setbacks in Frederick 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 Frederick County website.
Next to Frederick County: Carroll County, Montgomery County, Washington County.
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