County ZIP codes · Wisconsin · FIPS 55021
Columbia County, WI ZIP Codes
Columbia County, Wisconsin has 20 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 19 residential and 1 for PO boxes or a single organization. 13 of the residential ones lie mainly in Columbia County and 6 mainly in a neighboring county; 14 cross the county line. Median household income ranges from $66,667 in 53965 (Wisconsin Dells) to $119,305 in 53555 (Lodi) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Columbia County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $74,629 and $100,625.
They carry 19 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 19 residential ZIP codes in Columbia County
13 ZIP codes lie mainly in Columbia County; 6 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 53901 | Portage | 14,291 | 97 | $74k | $228k | 99% |
| 53555 | Lodi | 8,933 | 118 | $119k | $392k | 78% |
| 53925 | Columbus | 8,754 | 69 | $84k | $268k | 54% |
| 53954 | Pardeeville | 6,678 | 84 | $83k | $279k | 91% |
| 53955 | Poynette | 6,125 | 84 | $101k | $332k | 100% |
| 53956 | Randolph | 3,477 | 44 | $84k | $233k | 56% |
| 53960 | Rio | 3,396 | 38 | $85k | $282k | 100% |
| 53932 | Fall River | 2,495 | 66 | $86k | $309k | 92% |
| 53923 | Cambria | 2,295 | 30 | $73k | $221k | 90% |
| 53911 | Arlington | 1,450 | 40 | $101k | $296k | 92% |
| 53969 | Wyocena | 329 | 539 | $77k | $191k | 100% |
| 53935 | Friesland | 297 | 296 | $86k | $151k | 100% |
| 53928 | Doylestown | 63 | 64 | $86k | $138k | 100% |
Partly in Columbia County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 53561 | Merrimac | 1,872 | 51 | $91k | $428k | 28% |
| 53965 | Wisconsin Dells | 10,818 | 64 | $67k | $227k | 21% |
| 53926 | Dalton | 1,951 | 38 | $63k | $227k | 19% |
| 53578 | Prairie Du Sac | 6,503 | 151 | $106k | $347k | 19% |
| 53532 | Deforest | 16,514 | 305 | $110k | $372k | 15% |
| 53913 | Baraboo | 21,704 | 156 | $75k | $235k | 1% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
14 ZIP codes of Columbia County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Columbia | Elsewhere |
|---|---|---|
| 53913 | 1% | Sauk County99% |
| 53532 | 15% | Dane County85% |
| 53901 | 99% | Marquette County1% |
| 53965 | 21% | Adams County56%; Sauk County17%; Juneau County6% |
| 53555 | 78% | Dane County22% |
| 53925 | 54% | Dodge County36%; Dane County10% |
| 53954 | 91% | Marquette County9% |
| 53578 | 19% | Sauk County81% |
| 53956 | 56% | Dodge County40%; Green Lake County5% |
| 53932 | 92% | Dodge County8% |
| 53923 | 90% | Green Lake County10% |
| 53926 | 19% | Green Lake County55%; Marquette County26% |
| 53561 | 28% | Sauk County72% |
| 53911 | 92% | Dane County8% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 53957 | Randolph |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Columbia County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Columbia County's ZIP codes use 2 prefixes: 535 and 539.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.