First three digits · Wisconsin
ZIP Codes Starting with
66 ZIP codes start with 531, sorted at the Milwaukee, WI (SCF 530) sectional center (USPS labeling list L005, effective October 1, 2026) in Wisconsin: 55 residential ZIP codes across 6 counties and 11 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 531 mean?
The first digit, 5, is one of ten national areas (Iowa, Minnesota, Montana, North Dakota, South Dakota and Wisconsin). The first three, 531, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 531 to the Milwaukee, WI (SCF 530) facility. The last two digits pick the delivery area. By residents, the largest town names among the 531 ZIP codes are Kenosha, Waukesha, New Berlin, Oak Creek, Franklin and Burlington.
The same facility sorts 5 prefixes, 265 ZIP codes in all: 530, 531, 532, 534, 549.
Where are the 531 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 531
| County | ||||||
|---|---|---|---|---|---|---|
| 53101 | Bassett | Kenosha County | PO Box or unique | – | – | – |
| 53102 | Benet Lake | Kenosha County | PO Box or unique | – | – | – |
| 53103 | Big Bend | Waukesha County | 3,762 | 309 | $137k | $398k |
| 53104 | Bristol | Kenosha County | 5,826 | 169 | $112k | $325k |
| 53105 | Burlington | Racine County | 28,751 | 180 | $89k | $319k |
| 53108 | Caledonia | Racine County | 3,060 | 158 | $87k | $297k |
| 53109 | Camp Lake | Kenosha County | PO Box or unique | – | – | – |
| 53110 | Cudahy | Milwaukee County | 17,853 | 3,747 | $67k | $217k |
| 53114 | Darien | Walworth County | 1,979 | 66 | $73k | $241k |
| 53115 | Delavan | Walworth County | 16,381 | 228 | $72k | $252k |
| 53118 | Dousman | Waukesha County | 7,554 | 192 | $109k | $373k |
| 53119 | Eagle | Waukesha County | 5,803 | 145 | $118k | $417k |
| 53120 | East Troy | Walworth County | 10,848 | 192 | $96k | $336k |
| 53121 | Elkhorn | Walworth County | 18,551 | 162 | $86k | $314k |
| 53122 | Elm Grove | Waukesha County | 6,508 | 1,991 | $158k | $515k |
| 53125 | Fontana | Walworth County | 1,898 | 308 | $113k | $594k |
| 53126 | Franksville | Racine County | 7,064 | 135 | $101k | $386k |
| 53127 | Genesee Depot | Waukesha County | 79 | 97 | – | – |
| 53128 | Genoa City | Walworth County | 9,030 | 357 | $82k | $244k |
| 53129 | Greendale | Milwaukee County | 14,570 | 2,829 | $95k | $312k |
| 53130 | Hales Corners | Milwaukee County | 7,712 | 2,418 | $87k | $308k |
| 53132 | Franklin | Milwaukee County | 35,433 | 1,021 | $110k | $368k |
| 53137 | Helenville | Jefferson County | 1,650 | 50 | $117k | $366k |
| 53138 | Honey Creek | Walworth County | PO Box or unique | – | – | – |
| 53139 | Kansasville | Racine County | 2,523 | 79 | $100k | $306k |
| 53140 | Kenosha | Kenosha County | 30,238 | 3,832 | $58k | $207k |
| 53141 | Kenosha | Kenosha County | PO Box or unique | – | – | – |
| 53142 | Kenosha | Kenosha County | 34,144 | 1,651 | $89k | $268k |
| 53143 | Kenosha | Kenosha County | 20,889 | 5,042 | $68k | $201k |
| 53144 | Kenosha | Kenosha County | 26,652 | 614 | $77k | $260k |
| 53146 | New Berlin | Waukesha County | 7,285 | 398 | $110k | $346k |
| 53147 | Lake Geneva | Walworth County | 18,638 | 267 | $84k | $369k |
| 53148 | Lyons | Walworth County | PO Box or unique | – | – | – |
| 53149 | Mukwonago | Waukesha County | 19,614 | 339 | $111k | $414k |
| 53150 | Muskego | Waukesha County | 26,259 | 767 | $109k | $416k |
| 53151 | New Berlin | Waukesha County | 32,824 | 1,873 | $101k | $371k |
| 53152 | New Munster | Kenosha County | PO Box or unique | – | – | – |
| 53153 | North Prairie | Waukesha County | 2,548 | 534 | $153k | $430k |
| 53154 | Oak Creek | Milwaukee County | 37,325 | 1,312 | $97k | $332k |
| 53156 | Palmyra | Jefferson County | 3,232 | 105 | $85k | $238k |
| 53157 | Pell Lake | Walworth County | no residents | 0 | – | – |
| 53158 | Pleasant Prairie | Kenosha County | 18,420 | 609 | $106k | $376k |
| 53159 | Powers Lake | Kenosha County | PO Box or unique | – | – | – |
| 53167 | Rochester | Racine County | 157 | 355 | $70k | $345k |
| 53168 | Salem | Kenosha County | 9,036 | 278 | $97k | $300k |
| 53170 | Silver Lake | Kenosha County | 2,134 | 2,100 | $80k | $284k |
| 53171 | Somers | Kenosha County | PO Box or unique | – | – | – |
| 53172 | South Milwaukee | Milwaukee County | 20,442 | 4,236 | $73k | $236k |
| 53176 | Springfield | Walworth County | 100 | 287 | $46k | $265k |
| 53177 | Sturtevant | Racine County | 8,489 | 307 | $91k | $250k |
| 53178 | Sullivan | Jefferson County | 2,497 | 78 | $100k | $372k |
| 53179 | Trevor | Kenosha County | 6,469 | 615 | $95k | $306k |
| 53181 | Twin Lakes | Kenosha County | 7,964 | 581 | $98k | $294k |
| 53182 | Union Grove | Racine County | 9,821 | 178 | $107k | $329k |
| 53183 | Wales | Waukesha County | 3,111 | 879 | $109k | $399k |
| 53184 | Walworth | Walworth County | 4,169 | 135 | $84k | $315k |
| 53185 | Waterford | Racine County | 18,560 | 406 | $103k | $385k |
| 53186 | Waukesha | Waukesha County | 33,374 | 2,651 | $75k | $301k |
| 53187 | Waukesha | Waukesha County | PO Box or unique | – | – | – |
| 53188 | Waukesha | Waukesha County | 34,892 | 1,301 | $92k | $349k |
| 53189 | Waukesha | Waukesha County | 26,855 | 561 | $117k | $406k |
| 53190 | Whitewater | Walworth County | 20,499 | 157 | $66k | $265k |
| 53191 | Williams Bay | Walworth County | 3,261 | 825 | $76k | $415k |
| 53192 | Wilmot | Kenosha County | 252 | 188 | – | $264k |
| 53194 | Woodworth | Kenosha County | PO Box or unique | – | – | – |
| 53195 | Zenda | Walworth County | 133 | 405 | $96k | $174k |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.