County ZIP codes · Michigan · FIPS 26059
Hillsdale County, MI ZIP Codes
Hillsdale County, Michigan has 22 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 19 residential and 3 for PO boxes or a single organization. 13 of the residential ones lie mainly in Hillsdale County and 6 mainly in a neighboring county; 11 cross the county line. Median household income ranges from $53,587 in 49227 (Allen) to $82,407 in 49249 (Jerome) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Hillsdale 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 $56,389 and $66,833.
They carry 19 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 19 residential ZIP codes in Hillsdale County
13 ZIP codes lie mainly in Hillsdale County; 6 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 49242 | Hillsdale | 14,750 | 163 | $61k | $184k | 100% |
| 49250 | Jonesville | 5,653 | 72 | $66k | $170k | 96% |
| 49274 | Reading | 3,679 | 60 | $58k | $171k | 84% |
| 49249 | Jerome | 3,462 | 118 | $82k | $224k | 96% |
| 49266 | Osseo | 2,982 | 66 | $66k | $171k | 100% |
| 49232 | Camden | 2,790 | 44 | $56k | $211k | 100% |
| 49252 | Litchfield | 2,556 | 60 | $56k | $145k | 81% |
| 49271 | Pittsford | 2,280 | 43 | $56k | $147k | 100% |
| 49288 | Waldron | 1,483 | 39 | $67k | $148k | 87% |
| 49227 | Allen | 1,287 | 50 | $54k | $159k | 100% |
| 49262 | North Adams | 1,258 | 55 | $54k | $145k | 100% |
| 49282 | Somerset Center | 82 | 32 | $35k | – | 100% |
| 49258 | Mosherville | 29 | 1,933 | – | – | 100% |
Partly in Hillsdale County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 49255 | Montgomery | 2,072 | 52 | $51k | $141k | 39% |
| 49247 | Hudson | 5,205 | 62 | $60k | $150k | 36% |
| 49233 | Cement City | 2,938 | 138 | $81k | $230k | 36% |
| 49220 | Addison | 2,439 | 76 | $73k | $225k | 28% |
| 49246 | Horton | 3,382 | 98 | $82k | $254k | 8% |
| 49082 | Quincy | 6,678 | 79 | $74k | $177k | 7% |
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?
11 ZIP codes of Hillsdale County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Hillsdale | Elsewhere |
|---|---|---|
| 49082 | 7% | Branch County 93% |
| 49250 | 96% | Jackson County 4% |
| 49247 | 36% | Lenawee County 64% |
| 49274 | 84% | Branch County 16% |
| 49249 | 96% | Jackson County 4% |
| 49246 | 8% | Jackson County 92% |
| 49233 | 36% | Jackson County 36%; Lenawee County 28% |
| 49252 | 81% | Branch County 8%; Jackson County 7%; Calhoun County 5% |
| 49220 | 28% | Lenawee County 72% |
| 49255 | 39% | Branch County 61% |
| 49288 | 87% | Lenawee County 13% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 49239 | Frontier |
| 49257 | Moscow |
| 49281 | Somerset |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Hillsdale County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Hillsdale County's ZIP codes use 2 prefixes: 490 and 492.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.