County ZIP codes · Michigan · FIPS 26155
Shiawassee County, MI ZIP Codes
Shiawassee County, Michigan has 20 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 19 residential and 1 for PO boxes or a single organization. 12 of the residential ones lie mainly in Shiawassee County and 7 mainly in a neighboring county; 14 cross the county line. Median household income ranges from $55,194 in 48817 (Corunna) to $94,519 in 48848 (Laingsburg) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Shiawassee 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 $65,281 and $79,333.
They carry 19 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 19 residential ZIP codes in Shiawassee County
12 ZIP codes lie mainly in Shiawassee County; 7 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 48867 | Owosso | 27,500 | 202 | $60k | $154k | 100% |
| 48848 | Laingsburg | 8,344 | 122 | $95k | $261k | 60% |
| 48429 | Durand | 8,241 | 155 | $68k | $161k | 97% |
| 48872 | Perry | 6,142 | 111 | $79k | $237k | 80% |
| 48817 | Corunna | 5,416 | 92 | $55k | $172k | 100% |
| 48418 | Byron | 4,484 | 109 | $75k | $255k | 66% |
| 48857 | Morrice | 3,206 | 131 | $76k | $150k | 100% |
| 48449 | Lennon | 2,744 | 111 | $70k | $159k | 73% |
| 48460 | New Lothrop | 2,701 | 78 | $80k | $214k | 60% |
| 48414 | Bancroft | 2,488 | 79 | $68k | $195k | 100% |
| 48841 | Henderson | 729 | 31 | $60k | $164k | 79% |
| 48476 | Vernon | 689 | 1,009 | $70k | $134k | 100% |
Partly in Shiawassee County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 48866 | Ovid | 4,607 | 93 | $65k | $169k | 45% |
| 48831 | Elsie | 3,088 | 42 | $63k | $161k | 33% |
| 48840 | Haslett | 12,386 | 659 | $73k | $281k | 20% |
| 48436 | Gaines | 4,131 | 127 | $95k | $276k | 10% |
| 48649 | Oakley | 1,699 | 62 | $73k | $164k | 6% |
| 48433 | Flushing | 26,384 | 475 | $82k | $211k | 4% |
| 48616 | Chesaning | 7,577 | 93 | $67k | $163k | 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?
14 ZIP codes of Shiawassee County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Shiawassee | Elsewhere |
|---|---|---|
| 48433 | 4% | Genesee County 96% |
| 48840 | 20% | Ingham County 61%; Clinton County 19% |
| 48848 | 60% | Clinton County 40% |
| 48429 | 97% | Genesee County 3% |
| 48616 | 2% | Saginaw County 98% |
| 48872 | 80% | Ingham County 16%; Livingston County 4% |
| 48866 | 45% | Clinton County 55% |
| 48418 | 66% | Genesee County 25%; Livingston County 9% |
| 48436 | 10% | Genesee County 90% |
| 48831 | 33% | Clinton County 45%; Saginaw County 21%; Gratiot County 2% |
| 48449 | 73% | Genesee County 27% |
| 48460 | 60% | Saginaw County 40% |
| 48649 | 6% | Saginaw County 94% |
| 48841 | 79% | Saginaw County 21% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 48882 | Shaftsburg |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Shiawassee County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Shiawassee County's ZIP codes use 3 prefixes: 484, 486 and 488.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 484 | Metroplex, MI (SCF 480) | 8 | 60 |
| 486 | Metroplex, MI (SCF 480) | 2 | 60 |
| 488 | Lansing, MI (SCF 488) | 10 | 88 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.