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Where am ILOCATED

Columbia County, Wisconsin

Columbia County, Wisconsin, has 58,132 residents (July 2025 estimate). Its county seat is Portage. It uses Central Time and covers 766 sq mi (1,983 km²) of land.

MilwaukeeMadisonGreen Bay
Columbia County in Wisconsin
PortageColumbusLake WisconsinLodiPoynette
Columbia County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
58,132
Land area
766 sq mi (1,983 km²)
County seat or government
Portage
Time zone
Central TimeUTC-06:00 in January; UTC-05:00 in July
Median household income
$85,351 ± $2,745
Median home value
$283,200 ± $7,359
Median rent, with utilities
$978 ± $43
Homes lived in by their owners
76.7% ± 1.2 points
County type
County
Metro or micro area
Madison, WI metro areaOutlying county
Water area
30.4 sq mi (78.7 km²)
State
Wisconsin
County code (FIPS)
55021
Coordinates (central point)
43.471882, -89.330472
Open this point in the location finder

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 Columbia County

Time zoneLocal time and UTC offsetNext clock change
Central TimeAmerica/ChicagoUTC-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

  1. 5391321,704 people
  2. 5353216,514 people
  3. 5390114,291 people
  4. 5396510,818 people
  5. 535558,933 people
  6. 539258,754 people
  7. 539546,678 people
  8. 535786,503 people
  9. 539556,125 people
  10. 535835,816 people
  11. 539563,477 people
  12. 539603,396 people
All 20
  1. 539322,495 people
  2. 539232,295 people
  3. 539261,951 people
  4. 535611,872 people
  5. 539111,450 people
  6. 53969329 people
  7. 53935297 people
  8. 5392863 people

20 ZIP Code areas overlap Columbia 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 Columbia County, largest first

  1. Town of Lodi3,289 people
  2. Town of Pacific2,781 people
  3. Town of Dekorra2,467 people
  4. Town of West Point2,229 people
  5. Town of Wyocena2,101 people
  6. Town of Lewiston1,570 people
  7. Town of Caledonia1,408 people
  8. Town of Lowville1,042 people
  9. Town of Randolph1,005 people
  10. Town of Scott906 people
  11. Town of Fountain Prairie875 people
  12. Town of Leeds870 people
All 21
  1. Town of Arlington807 people
  2. Town of Fort Winnebago798 people
  3. Town of Marcellon760 people
  4. Town of Otsego755 people
  5. Town of Hampden733 people
  6. Town of Newport597 people
  7. Town of Courtland558 people
  8. Town of Columbus556 people
  9. Town of Springvale337 people

People counts are American Community Survey 2020–2024 5-year estimates. All towns in Wisconsin, by county

School districts in Columbia County, largest first

  1. DeForest Area School District24,317 people
  2. Baraboo School District21,662 people
  3. Portage Community School District17,239 people
  4. Sauk Prairie School District16,230 people
  5. Wisconsin Dells School District12,754 people
  6. Lodi School District10,376 people
  7. Columbus School District8,945 people
  8. Poynette School District7,070 people
  9. Markesan School District6,622 people
  10. Pardeeville Area School District6,396 people
  11. Randolph School District3,375 people
  12. Rio Community School District2,966 people
All 14
  1. Fall River School District2,863 people
  2. Cambria-Friesland School District2,474 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.

  1. Portage, Wisconsin (city)10,236 people
  2. Columbus, Wisconsin (city)5,488 people
  3. Lake Wisconsin, Wisconsin (CDP)5,384 people
  4. Lodi, Wisconsin (city)3,204 people
  5. Poynette, Wisconsin (village)2,678 people
  6. Wisconsin Dells, Wisconsin (city)2,547 people
  7. Fall River, Wisconsin (village)1,678 people
  8. Pardeeville, Wisconsin (village)1,672 people
  9. Randolph, Wisconsin (village)1,642 people
  10. Rio, Wisconsin (village)1,141 people
  11. Arlington, Wisconsin (village)946 people
  12. Cambria, Wisconsin (village)795 people
All 16
  1. Wyocena, Wisconsin (village)676 people
  2. Friesland, Wisconsin (village)297 people
  3. Dekorra, Wisconsin (CDP)161 people
  4. Doylestown, Wisconsin (village)160 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Marquette County, Wisconsin25 mi north
  2. Green Lake County, Wisconsin28 mi northeast
  3. Dane County, Wisconsin28 mi south
  4. Sauk County, Wisconsin31 mi west
  5. Dodge County, Wisconsin32 mi east
  6. Adams County, Wisconsin41 mi northwest

Before using this answer on a form

Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.

Find the county where you are now, check its ZIP area, or check the time zone where you are.

See this county on Census.gov ↗

Areas that only touch the edge

These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.