County ZIP codes · Michigan · FIPS 26115
Monroe County, MI ZIP Codes
Monroe County, Michigan has 24 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 23 residential and 1 for PO boxes or a single organization. 17 of the residential ones lie mainly in Monroe County and 6 mainly in a neighboring county; 8 cross the county line. Median household income ranges from $67,414 in 48161 (Monroe) to $109,257 in 48140 (Ida) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Monroe 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 $74,519 and $97,961.
They carry 22 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 23 residential ZIP codes in Monroe County
17 ZIP codes lie mainly in Monroe County; 6 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 48162 | Monroe | 28,156 | 490 | $68k | $200k | 100% |
| 48161 | Monroe | 26,304 | 587 | $67k | $176k | 100% |
| 48182 | Temperance | 20,179 | 514 | $84k | $254k | 100% |
| 48166 | Newport | 14,056 | 528 | $70k | $235k | 100% |
| 48160 | Milan | 13,972 | 179 | $104k | $265k | 52% |
| 48144 | Lambertville | 10,507 | 1,325 | $101k | $270k | 100% |
| 48117 | Carleton | 10,262 | 190 | $79k | $298k | 99% |
| 48131 | Dundee | 8,637 | 172 | $86k | $274k | 100% |
| 48133 | Erie | 7,085 | 261 | $74k | $184k | 100% |
| 49270 | Petersburg | 5,567 | 124 | $95k | $298k | 100% |
| 49267 | Ottawa Lake | 3,974 | 102 | $98k | $268k | 79% |
| 48140 | Ida | 3,664 | 139 | $109k | $288k | 100% |
| 48179 | South Rockwood | 3,209 | 158 | $77k | $233k | 100% |
| 48145 | La Salle | 2,904 | 171 | $83k | $231k | 100% |
| 48159 | Maybee | 2,578 | 80 | $75k | $235k | 100% |
| 48157 | Luna Pier | 1,244 | 1,322 | $62k | $189k | 100% |
| 48177 | Samaria | 533 | 753 | $82k | $210k | 100% |
Partly in Monroe County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 49276 | Riga | 703 | 31 | $74k | $193k | 31% |
| 49238 | Deerfield | 1,914 | 64 | $75k | $208k | 30% |
| 48134 | Flat Rock | 23,935 | 1,291 | $92k | $276k | 15% |
| 48191 | Willis | 4,403 | 273 | $103k | $272k | 12% |
| 49229 | Britton | 3,540 | 63 | $95k | $227k | 11% |
| 48164 | New Boston | 9,576 | 316 | $108k | $310k | 4% |
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?
9 ZIP codes of Monroe County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Monroe | Elsewhere |
|---|---|---|
| 48134 | 15% | Wayne County 85% |
| 48160 | 52% | Washtenaw County 48% |
| 48117 | 99% | |
| 48164 | 4% | Wayne County 96% |
| 48191 | 12% | Washtenaw County 88% |
| 49267 | 79% | Lenawee County 21% |
| 49229 | 11% | Lenawee County 88%; Washtenaw County 1% |
| 49238 | 30% | Lenawee County 70% |
| 49276 | 31% | Lenawee County 69% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 48110 | Azalia |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Monroe County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Monroe County's ZIP codes use 2 prefixes: 481 and 492.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.