Grant County, Wisconsin
Grant County, Wisconsin, has 52,446 residents (July 2025 estimate). Its county seat is Lancaster. It uses Central Time and covers 1,148 sq mi (2,972 km²) of land.
- Resident population, July 2025
- 52,446
- Land area
- 1,148 sq mi (2,972 km²)
- County seat or government
- Lancaster
- Time zone
- Central TimeUTC-06:00 in January; UTC-05:00 in July
- Median household income
- $66,858 ± $2,270
- Median home value
- $200,700 ± $5,671
- Median rent, with utilities
- $813 ± $26
- Homes lived in by their owners
- 69.8% ± 1.2 points
- County type
- County
- Metro or micro area
- Platteville, WI micro areaCentral county
- Water area
- 35.8 sq mi (92.6 km²)
- State
- Wisconsin
- County code (FIPS)
- 55043
- Coordinates (central point)
- 42.870028, -90.694229
These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.
Time zones in Grant County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| Central TimeAmerica/Chicago | UTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.
ZIP Code areas, largest first
- 5381816,024 people
- 538217,780 people
- 538136,222 people
- 538055,554 people
- 538094,748 people
- 538074,209 people
- 538113,093 people
- 535732,906 people
- 538202,467 people
- 535431,758 people
- 538061,514 people
- 535181,489 people
All 24
24 ZIP Code areas overlap Grant County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.
Official county information
We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Towns in Grant County, largest first
- Town of Jamestown1,965 people
- Town of Platteville1,769 people
- Town of Hazel Green950 people
- Town of Lima876 people
- Town of Fennimore815 people
- Town of South Lancaster808 people
- Town of Beetown792 people
- Town of Muscoda744 people
- Town of Smelser743 people
- Town of Potosi686 people
- Town of Mount Ida682 people
- Town of Waterloo675 people
All 33
- Town of Paris672 people
- Town of Hickory Grove649 people
- Town of Ellenboro604 people
- Town of Marion580 people
- Town of North Lancaster571 people
- Town of Harrison541 people
- Town of Patch Grove541 people
- Town of Boscobel510 people
- Town of Liberty507 people
- Town of Clifton456 people
- Town of Glen Haven411 people
- Town of Cassville402 people
- Town of Watterstown397 people
- Town of Castle Rock353 people
- Town of Wyalusing352 people
- Town of Bloomington308 people
- Town of Wingville302 people
- Town of Mount Hope280 people
- Town of Little Grant253 people
- Town of Woodman191 people
- Town of Millville121 people
People counts are American Community Survey 2020–2024 5-year estimates. All towns in Wisconsin, by county
School districts in Grant County, largest first
- Platteville School District15,808 people
- Lancaster Community School District6,271 people
- Boscobel Area School District6,178 people
- Fennimore Community School District5,275 people
- Riverdale School District4,687 people
- Cuba City School District4,514 people
- Iowa-Grant School District4,068 people
- River Ridge School District3,662 people
- Southwestern Wisconsin School District3,654 people
- Potosi School District2,018 people
- Cassville School District1,880 people
- Highland School District1,720 people
All 13
- Benton School District1,633 people
Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.
Cities, towns and communities, largest first
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Platteville, Wisconsin (city)11,499 people
- Lancaster, Wisconsin (city)3,976 people
- Boscobel, Wisconsin (city)3,242 people
- Fennimore, Wisconsin (city)2,752 people
- Cuba City, Wisconsin (city)2,007 people
- Hazel Green, Wisconsin (village)1,204 people
- Muscoda, Wisconsin (village)1,151 people
- Dickeyville, Wisconsin (village)878 people
- Bloomington, Wisconsin (village)710 people
- Cassville, Wisconsin (village)634 people
- Montfort, Wisconsin (village)629 people
- Potosi, Wisconsin (village)595 people
All 22
- Livingston, Wisconsin (village)555 people
- Blue River, Wisconsin (village)472 people
- Kieler, Wisconsin (CDP)358 people
- Bagley, Wisconsin (village)337 people
- Tennyson, Wisconsin (village)308 people
- Sandy Hook, Wisconsin (CDP)268 people
- Mount Hope, Wisconsin (village)230 people
- Patch Grove, Wisconsin (village)227 people
- Woodman, Wisconsin (village)224 people
- Glen Haven, Wisconsin (CDP)68 people
Bordering areas, nearest first
Distances are straight lines between map points.
- Crawford County, Wisconsin28 mi northwest
- Dubuque County, Iowa30 mi south
- Iowa County, Wisconsin30 mi east
- Clayton County, Iowa32 mi west
- Lafayette County, Wisconsin32 mi southeast
- Richland County, Wisconsin37 mi north
- Jo Daviess County, Illinois43 mi southeast
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