First three digits · Wisconsin
ZIP Codes Starting with
30 ZIP codes start with 542, sorted at the Green Bay, WI (SCF 541) sectional center (USPS labeling list L005, effective October 1, 2026) in Wisconsin: 27 residential ZIP codes across 4 counties and 3 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 542 mean?
The first digit, 5, is one of ten national areas (Iowa, Minnesota, Montana, North Dakota, South Dakota and Wisconsin). The first three, 542, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 542 to the Green Bay, WI (SCF 541) facility. The last two digits pick the delivery area. By residents, the largest town names among the 542 ZIP codes are Manitowoc, Sturgeon Bay, Two Rivers, Luxemburg, Denmark and Kewaunee.
The same facility sorts 5 prefixes, 231 ZIP codes in all: 541, 542, 543, 544, 545.
Where are the 542 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 542
| County | ||||||
|---|---|---|---|---|---|---|
| 54201 | Algoma | Kewaunee County | 5,209 | 69 | $68k | $183k |
| 54202 | Baileys Harbor | Door County | 1,772 | 41 | $74k | $432k |
| 54204 | Brussels | Door County | 2,139 | 44 | $80k | $380k |
| 54205 | Casco | Kewaunee County | 2,229 | 51 | $91k | $253k |
| 54207 | Collins | Manitowoc County | 176 | 158 | $58k | $160k |
| 54208 | Denmark | Brown County | 6,231 | 63 | $96k | $301k |
| 54209 | Egg Harbor | Door County | 1,485 | 39 | $77k | $387k |
| 54210 | Ellison Bay | Door County | 942 | 36 | $77k | $356k |
| 54211 | Ephraim | Door County | 403 | 113 | $101k | $500k |
| 54212 | Fish Creek | Door County | 980 | 30 | $105k | $500k |
| 54213 | Forestville | Door County | 1,395 | 36 | $97k | $207k |
| 54214 | Francis Creek | Manitowoc County | 436 | 912 | $88k | $261k |
| 54215 | Kellnersville | Manitowoc County | 186 | 466 | $46k | $155k |
| 54216 | Kewaunee | Kewaunee County | 6,075 | 57 | $84k | $186k |
| 54217 | Luxemburg | Kewaunee County | 8,022 | 72 | $90k | $285k |
| 54220 | Manitowoc | Manitowoc County | 40,949 | 415 | $66k | $176k |
| 54221 | Manitowoc | Manitowoc County | PO Box or unique | – | – | – |
| 54226 | Maplewood | Door County | PO Box or unique | – | – | – |
| 54227 | Maribel | Manitowoc County | 1,621 | 50 | $88k | $247k |
| 54228 | Mishicot | Manitowoc County | 2,762 | 69 | $72k | $185k |
| 54229 | New Franken | Brown County | 4,329 | 112 | $97k | $300k |
| 54230 | Reedsville | Manitowoc County | 4,158 | 38 | $88k | $227k |
| 54232 | Saint Nazianz | Manitowoc County | 907 | 1,142 | $58k | $139k |
| 54234 | Sister Bay | Door County | 2,158 | 92 | $75k | $456k |
| 54235 | Sturgeon Bay | Door County | 17,749 | 93 | $70k | $297k |
| 54240 | Tisch Mills | Manitowoc County | PO Box or unique | – | – | – |
| 54241 | Two Rivers | Manitowoc County | 14,120 | 210 | $61k | $156k |
| 54245 | Valders | Manitowoc County | 2,069 | 53 | $85k | $227k |
| 54246 | Washington Island | Door County | 803 | 32 | $70k | $322k |
| 54247 | Whitelaw | Manitowoc County | 2,558 | 78 | $78k | $203k |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.