County ZIP codes · Wisconsin · FIPS 55043
Grant County, WI ZIP Codes
Grant County, Wisconsin has 25 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 24 residential and 1 for PO boxes or a single organization. 21 of the residential ones lie mainly in Grant County and 3 mainly in a neighboring county; 10 cross the county line. Median household income ranges from $55,567 in 53818 (Platteville) to $84,004 in 53813 (Lancaster) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Grant 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 $62,384 and $77,083.
They carry 24 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 24 residential ZIP codes in Grant County
21 ZIP codes lie mainly in Grant County; 3 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 53818 | Platteville | 16,024 | 104 | $56k | $237k | 81% |
| 53813 | Lancaster | 6,222 | 43 | $84k | $220k | 100% |
| 53805 | Boscobel | 5,554 | 42 | $61k | $164k | 64% |
| 53809 | Fennimore | 4,748 | 46 | $66k | $193k | 100% |
| 53807 | Cuba City | 4,209 | 40 | $78k | $226k | 59% |
| 53811 | Hazel Green | 3,093 | 66 | $83k | $225k | 83% |
| 53573 | Muscoda | 2,906 | 27 | $65k | $182k | 42% |
| 53820 | Potosi | 2,467 | 28 | $77k | $202k | 100% |
| 53806 | Cassville | 1,514 | 22 | $64k | $165k | 100% |
| 53804 | Bloomington | 1,275 | 24 | $83k | $166k | 100% |
| 53554 | Livingston | 1,029 | 23 | $74k | $175k | 67% |
| 53801 | Bagley | 998 | 17 | $65k | $135k | 100% |
| 53569 | Montfort | 978 | 22 | $90k | $207k | 54% |
| 53808 | Dickeyville | 905 | 365 | $71k | $193k | 100% |
| 53816 | Mount Hope | 856 | 14 | $71k | $201k | 100% |
| 53827 | Woodman | 429 | 12 | $82k | $163k | 100% |
| 53810 | Glen Haven | 389 | 10 | $76k | $168k | 100% |
| 53825 | Stitzer | 358 | 11 | $103k | $171k | 100% |
| 53812 | Kieler | 254 | 508 | $81k | $199k | 100% |
| 53817 | Patch Grove | 227 | 599 | $49k | $150k | 100% |
| 53802 | Beetown | 132 | 78 | $80k | $170k | 100% |
Partly in Grant County
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?
10 ZIP codes of Grant County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Grant | Elsewhere |
|---|---|---|
| 53818 | 81% | Lafayette County17%; Iowa County2% |
| 53821 | 23% | Crawford County77% |
| 53805 | 64% | Crawford County36% |
| 53807 | 59% | Lafayette County41% |
| 53811 | 83% | Lafayette County17% |
| 53573 | 42% | Richland County41%; Iowa County17% |
| 53543 | 18% | Iowa County82% |
| 53518 | 16% | Richland County80%; Crawford County4% |
| 53554 | 67% | Iowa County33% |
| 53569 | 54% | Iowa County46% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 53824 | Sinsinawa |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Grant County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Grant County's ZIP codes use 2 prefixes: 535 and 538.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.