County · code 55043
Grant CountyWisconsin
Grant County is in Wisconsin, with its county seat in Lancaster. The county was created in 1837 from Iowa.
- Founded1837
- County seatLancaster
- Named forGrant
- Land area1,147 sq mi + 36 sq mi water
- Population51,938 2020 Census
- Parcels mapped48,765 checked 14 October 2026
Where it is
Grant on the map of Wisconsin
Wisconsin has 72 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Formed in 1837 from Iowa County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Grant County was created on March 4, 1837, by Wisconsin Territory from Iowa. When Wisconsin became a state in 1848, Grant became one of its counties.
- 1837Grant County created Grant created by Wisconsin Territory from Iowa. · Wis. Terr. Laws 1836, no. 31, secs. 1-2, 4-6, 9/pp. 97-99
- 1848Became part of Wisconsin Grant became a county in the state of Wisconsin. · U.S. Stat., vol. 9, ch. 89 [1846]/pp. 56-58, and ch. 50 [1848]/pp. 233-235; Van Zandt, 128, 130
Land and parcels
What the maps cover in Grant
Who publishes each layer, how good it is, and when we last checked.
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Parcels Good enough
Lot lines and tax-map numbers for 48,765 parcels from Wisconsin DOA, Wisconsin Land Information Program, with the State Cartographer's Office (V12 Statewide Parcels). Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 30 June 2026 · checked 14 October 2026 -
Address points Missing
No public address points layer found for Grant County yet.
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Buildings Reference
Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026
- Official
- from the office that keeps the record
- Good enough
- a reliable statewide or national copy
- Fallback
- a guide only; check the official record
- Missing
- nothing public found yet
People and land
Grant by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
Rules and offices
Who to ask before you build, dig or sell
Official county pages only. We link to them; we do not copy them, because they change.
Inside a city or town, permits usually come from that city rather than the county.
Records
- Clerk of court: deeds and plats
County Directory 26-27
Zoning and code
County government
- County government
The official website of Grant County.
See your own lot on these maps
Open Grant County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.
Questions
Common questions about Grant County
- When was Grant County founded?
- Grant County was founded in 1837, formed from Iowa County, and named after Grant.
- What is the county seat of Grant County?
- The county seat of Grant County is Lancaster.
- Is there an online parcel map for Grant County?
- Yes. Wisconsin DOA, Wisconsin Land Information Program, with the State Cartographer's Office (V12 Statewide Parcels) publishes a parcel map of 48,765 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Grant County's boundary or name changed?
- Grant County was created in 1837 from Iowa County. Since then the Atlas of Historical County Boundaries records 1 later change.
- Is my lot in a flood zone?
- We do not have flood maps for Grant County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby