Knox County, TN zoning map, flood zone and property lines by address
Free, no account. Or open the Tennessee map and tap a lot.
Towns in Knox County: Knoxville, Farragut, Mascot.
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 Knox County has 132 FIRM panels, the newest effective August 2013; 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 Knox 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 Tennessee Comptroller property boundaries layer (from each county assessor of property), so a Knox lot shows the same lines the assessor of property draws. Knox County covers about 325,367 acres of land and 11,195 acres of water.
Mapped lines are approximate. The Knox County assessor of property keeps the parcel record (Knox County website); a licensed surveyor sets the true corners.
Zoning
Knox County zones its unincorporated land, and Knoxville, Farragut each zone the land inside their limits. ParcelSheet shows the use the assessor of property 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 Tennessee's zoning laws (Tennessee Code Title 13, Chapter 7), local governments can allow an accessory dwelling unit on a lot with a house. Whether a Knox 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. Knox County is soil survey area TN093, Knox County, Tennessee, last updated August 2026, on Web Soil Survey.
A new or changed septic system in Knox County needs a permit from the TDEC Division of Water Resources, or the county health department in a county that runs its own septic program, which tests the soil on the lot itself.
Setbacks
Setbacks in Knox 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 Knoxville and Farragut for land inside their limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Knox lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Knox 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 Knox County has 132 panels, the newest effective August 2013. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Knox County?
Open the Tennessee map, type the address, and the parcel outline from the Knox County assessor of property 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 Knox County?
Zoning in Knox County is set by the county for unincorporated land and by each city (such as Knoxville, Farragut) inside its own limits. ParcelSheet shows the use code the assessor of property lists and links the office that sets the zoning; the planning office has the final word.
Can I build an ADU in Knox County?
Under Tennessee's zoning laws (Tennessee Code Title 13, Chapter 7), counties and cities can allow an accessory dwelling unit, and each sets its own rules. In Knox 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 Knox County?
Yes. A new or changed septic system in Knox County needs a permit from the TDEC Division of Water Resources, or the county health department in a county that runs its own septic program. ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area TN093 (Knox County, Tennessee).
What can I build on 5 acres in Knox County?
Zoning in Knox County is set by the county for unincorporated land and each city inside its own limits (such as Knoxville, Farragut). 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 Knox County website.
What are the residential setbacks in Knox County (2026)?
Setbacks in Knox 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 Knox County website.
Next to Knox County: Anderson County, Blount County, Grainger County, Jefferson County, Loudon County, Sevier County, Union County.
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