| ZIP Codes: | 34 ZIP Codes (19 Standard, 4 PO Box, 11 Unique) [See All] |
| Area Code: | 517 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:12:32 PM |
| Population: | 276,105 [See All] |
| FIPS: | 26065 |
| CBSA: | Lansing-East Lansing, MI |
| Land Area: | 584 sq mi |
| Water Area: | 5 sq mi |
| Coordinates: | 42.6809, -84.4757 |
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276,105 residents live across 34 ZIPs covering 584 sq mi, served by 12 distinct USPS-recognized cities.
Population moved from 273,733 to 274,008 from 2014 to 2024 — a +0.1% change. 8 ZIPs gained residents, 9 lost.
The county's wealthiest ZIP 48864 (Okemos, $121,103 median) and poorest ZIP 48933 (Lansing, $33,589) are 7.1 miles apart — a 3.6× income gap across local geography.
Median home values vary 3.4× across this county — from $112,900 in 48933 (Lansing) to $378,700 in 48864 (Okemos).
Density varies 497× across the county — from 53 people/sq mi in 49264 (Onondaga) to 26,158 in 48825 (East Lansing).
Most of the decade's growth concentrated around Lansing — top growth ZIPs averaged +15.0% over the past ten years ( 48933 , 48864 and 48915 ).
Educational attainment ranges from 19.8% bachelor's+ in 48892 (Webberville) to 75.5% in 48864 (Okemos) — the breadth of educational profiles across the area.
Within Michigan, this is the #8 most populous of 83 counties and ranks #22 for median household income .
Hosts 4 single-entity Unique ZIPs: 48916Lucky Losers ; 48951Jackson National Life Ins Co ; 48913State Of Michigan ; and 48918Secretary Of State .
Weighted by population, the typical household earns about $71,060 across the county — reflecting what a typical resident sees, not a simple ZIP average.
42.3% of adults age 25+ hold a bachelor's degree or higher (72,493 of 171,342 reporting). The most-educated ZIPs cluster around East Lansing.
19 Standard delivery, 4 PO Box only, 11 single-entity Unique ZIPs serve this county.
2 ZIPs in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
11 ZIP codes in this county serve a single facility — typically theme parks, universities, large corporations, airports, or government complexes.
Median household income spans 3.6× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 48823 | East Lansing | Standard | 50,034 | $52,018 | 23.8 | -0.1% |
| 48911 | Lansing | Standard | 39,876 | $56,631 | 17.7 | 1.5% |
| 48910 | Lansing | Standard | 32,800 | $54,712 | 14.6 | -7.7% |
| 48864 | Okemos | Standard | 23,901 | $121,103 | 20.1 | 15.3% |
| 48842 | Holt | Standard | 21,945 | $88,340 | 17.6 | 7.2% |
| 48854 | Mason | Standard | 19,529 | $94,716 | 113.0 | 4.9% |
| 48912 | Lansing | Standard | 17,674 | $54,429 | 5.1 | -2.3% |
| 48840 | Haslett | Standard | 12,386 | $73,408 | 20.1 | -6.9% |
| 48825 | East Lansing | Standard | 11,295 | — | 0.4 | -14.6% |
| 48895 | Williamston | Standard | 11,116 | $93,418 | 82.4 | -1.5% |
| 48915 | Lansing | Standard | 9,428 | $54,465 | 2.4 | 10.7% |
| 49285 | Stockbridge | Standard | 6,240 | $73,375 | 78.4 | 7.9% |
| 49251 | Leslie | Standard | 5,958 | $85,253 | 61.5 | -10.1% |
| 48892 | Webberville | Standard | 4,715 | $89,125 | 56.0 | 1.9% |
| 48933 | Lansing | Standard | 3,107 | $33,589 | 0.8 | 19.0% |
| 48819 | Dansville | Standard | 2,550 | $110,833 | 41.0 | -5.2% |
| 48824 | East Lansing | Standard | 2,097 | — | 1.5 | — |
| 49264 | Onondaga | Standard | 1,454 | $92,188 | 27.6 | -35.0% |
| 48916 | Lansing | Unique | — | — | 0.0 | — |
| 48951 | Lansing | Unique | — | — | 0.0 | — |
| 48909 | Lansing | PO Box | — | — | 0.0 | — |
| 48913 | Lansing | Unique | — | — | 0.0 | — |
| 48918 | Lansing | Unique | — | — | 0.0 | — |
| 48980 | Lansing | Unique | — | — | 0.0 | — |
| 48924 | Lansing | Standard | — | — | 0.0 | — |
| 48922 | Lansing | Unique | — | — | 0.0 | — |
| 48901 | Lansing | PO Box | — | — | 0.0 | — |
| 48930 | Lansing | Unique | — | — | 0.0 | — |
| 48929 | Lansing | Unique | — | — | 0.0 | — |
| 48956 | Lansing | Unique | — | — | 0.0 | — |
| 48826 | East Lansing | PO Box | — | — | 0.0 | — |
| 48805 | Okemos | PO Box | — | — | 0.0 | — |
| 48919 | Lansing | Unique | — | — | 0.0 | — |
| 48937 | Lansing | Unique | — | — | 0.0 | — |