Liberty County, MT zoning map, flood zone and property lines by address
Free, no account. Or open the Montana map and tap a lot.
Towns in Liberty County: Chester.
Property lines
The parcel outline, parcel number and mapped size come from the Montana State Library, Montana Cadastral (MSDI), from Department of Revenue records, so a Liberty lot shows the same lines the Montana Department of Revenue draws. Liberty County covers about 915,192 acres of land and 10,974 acres of water.
Mapped lines are approximate. The Montana Department of Revenue keeps the parcel record (Liberty County website); a licensed surveyor sets the true corners.
Zoning
Liberty County zones its unincorporated land, and Chester zones the land inside its limits. ParcelSheet shows the use the Montana Department of Revenue 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 Montana's county zoning laws (Montana Code Annotated Title 76, Chapter 2, Parts 1 and 2), local governments can allow an accessory dwelling unit on a lot with a house. Whether a Liberty 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. Liberty County is soil survey area MT051, Liberty County, Montana, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Liberty County needs a permit from the Liberty County sanitarian (local health department, under Montana DEQ standards).
Setbacks
Setbacks in Liberty 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 Chester for land inside its limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Liberty lot and the Forest Service wildfire hazard rating at it.
Questions
How do I find property lines in Liberty County?
Open the Montana map, type the address, and the parcel outline from the Montana Department of Revenue 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 Liberty County?
Zoning in Liberty County is set by the county for unincorporated land and by each city (such as Chester) inside its own limits. ParcelSheet shows the use code the Montana Department of Revenue lists and links the office that sets the zoning; the planning office has the final word.
Can I build an ADU in Liberty County?
Under Montana's county zoning laws (Montana Code Annotated Title 76, Chapter 2, Parts 1 and 2), counties and cities can allow an accessory dwelling unit, and each sets its own rules. In Liberty 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 Liberty County?
Yes. A new or changed septic system in Liberty County needs a permit from the Liberty County sanitarian (local health department, under Montana DEQ standards). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area MT051 (Liberty County, Montana).
What can I build on 5 acres in Liberty County?
Zoning in Liberty County is set by the county for unincorporated land and each city inside its own limits (such as Chester). 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 Liberty County website.
What are the residential setbacks in Liberty County (2026)?
Setbacks in Liberty 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 Liberty County website.
Next to Liberty County: Chouteau County, Hill County, Pondera County, Toole County.
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