County ZIP codes · Michigan · FIPS 26049
Genesee County, MI ZIP Codes
Genesee County, Michigan has 43 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 32 residential and 11 for PO boxes or a single organization. 23 of the residential ones lie mainly in Genesee County and 9 mainly in a neighboring county; 17 cross the county line. Median household income ranges from $33,283 in 48505 (Flint) to $106,796 in 48438 (Goodrich) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Genesee 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 $61,998 and $81,417.
They carry 24 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 32 residential ZIP codes in Genesee County
23 ZIP codes lie mainly in Genesee County; 9 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 48439 | Grand Blanc | 51,900 | 952 | $89k | $262k | 99% |
| 48423 | Davison | 33,757 | 524 | $65k | $223k | 99% |
| 48507 | Flint | 28,723 | 1,302 | $47k | $111k | 100% |
| 48433 | Flushing | 26,384 | 475 | $82k | $211k | 96% |
| 48506 | Flint | 24,712 | 1,336 | $48k | $92k | 100% |
| 48504 | Flint | 24,218 | 1,645 | $39k | $54k | 100% |
| 48503 | Flint | 22,347 | 2,643 | $44k | $84k | 100% |
| 48473 | Swartz Creek | 22,339 | 397 | $78k | $206k | 100% |
| 48420 | Clio | 21,195 | 319 | $66k | $192k | 96% |
| 48458 | Mount Morris | 19,519 | 546 | $47k | $96k | 100% |
| 48532 | Flint | 18,496 | 1,159 | $62k | $169k | 100% |
| 48505 | Flint | 18,032 | 1,446 | $33k | $32k | 100% |
| 48451 | Linden | 16,097 | 473 | $100k | $283k | 74% |
| 48529 | Burton | 9,339 | 1,944 | $41k | $87k | 100% |
| 48457 | Montrose | 8,770 | 204 | $71k | $176k | 73% |
| 48509 | Burton | 8,645 | 983 | $64k | $136k | 100% |
| 48519 | Burton | 8,096 | 1,032 | $64k | $159k | 100% |
| 48438 | Goodrich | 7,591 | 238 | $107k | $337k | 71% |
| 48463 | Otisville | 4,393 | 132 | $73k | $192k | 100% |
| 48436 | Gaines | 4,131 | 127 | $95k | $276k | 90% |
| 48502 | Flint | 1,420 | 3,100 | $50k | – | 100% |
| 48437 | Genesee | 279 | 483 | $41k | $117k | 100% |
| 48411 | Atlas | 56 | 211 | – | – | 100% |
Partly in Genesee County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 48449 | Lennon | 2,744 | 111 | $70k | $159k | 27% |
| 48418 | Byron | 4,484 | 109 | $75k | $255k | 25% |
| 48430 | Fenton | 39,309 | 473 | $100k | $326k | 22% |
| 48746 | Millington | 8,222 | 100 | $67k | $162k | 11% |
| 48464 | Otter Lake | 2,152 | 126 | $81k | $206k | 7% |
| 48421 | Columbiaville | 6,935 | 167 | $71k | $221k | 5% |
| 48429 | Durand | 8,241 | 155 | $68k | $161k | 3% |
| 48442 | Holly | 22,788 | 265 | $87k | $266k | 3% |
| 48415 | Birch Run | 8,918 | 138 | $79k | $210k | 2% |
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?
17 ZIP codes of Genesee County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Genesee | Elsewhere |
|---|---|---|
| 48439 | 99% | Oakland County 1% |
| 48430 | 22% | Livingston County 68%; Oakland County 10% |
| 48423 | 99% | Lapeer County 1% |
| 48433 | 96% | Shiawassee County 4% |
| 48442 | 3% | Oakland County 96%; Livingston County 1% |
| 48420 | 96% | Tuscola County 3% |
| 48451 | 74% | Livingston County 26% |
| 48415 | 2% | Saginaw County 95%; Tuscola County 3% |
| 48457 | 73% | Saginaw County 27% |
| 48429 | 3% | Shiawassee County 97% |
| 48746 | 11% | Tuscola County 89% |
| 48438 | 71% | Lapeer County 29% |
| 48421 | 5% | Lapeer County 95% |
| 48418 | 25% | Shiawassee County 66%; Livingston County 9% |
| 48436 | 90% | Shiawassee County 10% |
| 48449 | 27% | Shiawassee County 73% |
| 48464 | 7% | Lapeer County 81%; Tuscola County 12% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Genesee County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Genesee County's ZIP codes use 3 prefixes: 484, 485 and 487.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 484 | Metroplex, MI (SCF 480) | 22 | 60 |
| 485 | Metroplex, MI (SCF 480) | 20 | 20 |
| 487 | Metroplex, MI (SCF 480) | 1 | 54 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.