ZIP codes

ZIP codes in Genesee County, Michigan

Genesee County has 32 ZIP codes. 15 lie entirely inside it and 17 are shared with neighboring counties, so part of their land and their people are elsewhere. About 405,825 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes: 32; 2 more just touch the border (under 1% of their land)
Entirely inside: 15; 99% or more of their land
Shared with other counties: 17; Most with Shiawassee County (5)
Most populated ZIP: 48439; 51,900 people · Grand Blanc
Least populated ZIP: 48411; 56 people
Largest ZIP by land: 48420; 66 sq mi · Clio

Map of the ZIP codes in Genesee County

Entirely in the county (99% or more of its land)
Shared, mostly in this county
Shared, mostly in other counties
Neighboring counties

Open in the interactive tool

Each area is a ZIP code with its number where it fits. Hover over one to see its name.

All ZIP codes in Genesee County

32 ZIP codes in Genesee County, MI, by number
ZIP code	Main city	Population	Land in the county	Residents in the county
48411	—	56	100%	56
48415	Birch Run	8,918	1.9%	≈ 323
48418	Byron	4,484	25%	≈ 1,648
48420	Clio	21,195	96%	≈ 20,908
48421	Millers Lake	6,935	5.0%	≈ 516
48423	Davison	33,757	99%	≈ 33,610
48429	Durand	8,241	3.2%	≈ 299
48430	Fenton	39,309	22%	≈ 21,795
48433	Flushing	26,384	96%	≈ 26,272
48436	Gaines	4,131	90%	≈ 3,763
48437	—	279	100%	279
48438	Goodrich	7,591	71%	≈ 6,331
48439	Grand Blanc	51,900	99%	≈ 51,750
48442	Holly	22,788	2.9%	≈ 2,372
48449	Lennon	2,744	27%	≈ 1,400
48451	Linden	16,097	74%	≈ 15,105
48457	Burt	8,770	73%	≈ 7,846
48458	Beecher	19,519	100%	19,519
48463	Otisville	4,393	99.7%	≈ 4,382
48464	Otter Lake	2,152	7.1%	≈ 187
48473	Swartz Creek	22,339	100%	22,339
48502	Flint	1,420	100%	1,420
48503	Flint	22,347	100%	22,347
48504	Flint	24,218	100%	24,218
48505	Flint	18,032	100%	18,032
48506	Flint	24,712	100%	24,712
48507	Flint	28,723	100%	28,723
48509	Burton	8,645	100%	8,645
48519	Burton	8,096	100%	8,096
48529	Burton	9,339	100%	9,339
48532	Flint	18,496	100%	18,496
48746	Millington	8,222	11%	≈ 1,032

They also touch the county with under 1% of their land, so they aren’t counted: 48460 and 48462.

ZIP codes shared with other counties

These 17 ZIP codes have part of their land in another county. The first figure is the share of their land in Genesee County; then, where the rest lies.

48415 (Birch Run): 1.9% here; 95% in Saginaw County and 2.9% in Tuscola County.
48418 (Byron): 25% here; 66% in Shiawassee County and 9.1% in Livingston County.
48420 (Clio): 96% here; 3.3% in Tuscola County.
48421 (Millers Lake): 5.0% here; 95% in Lapeer County.
48423 (Davison): 99% here; 1.3% in Lapeer County.
48429 (Durand): 3.2% here; 97% in Shiawassee County.
48430 (Fenton): 22% here; 68% in Livingston County and 9.9% in Oakland County.
48433 (Flushing): 96% here; 3.9% in Shiawassee County.
48436 (Gaines): 90% here; 9.5% in Shiawassee County.
48438 (Goodrich): 71% here; 29% in Lapeer County.
48439 (Grand Blanc): 99% here; 1.3% in Oakland County.
48442 (Holly): 2.9% here; 96% in Oakland County and 1.1% in Livingston County.
48449 (Lennon): 27% here; 73% in Shiawassee County.
48451 (Linden): 74% here; 26% in Livingston County.
48457 (Burt): 73% here; 27% in Saginaw County.
48464 (Otter Lake): 7.1% here; 81% in Lapeer County and 12% in Tuscola County.
48746 (Millington): 11% here; 89% in Tuscola County.

Cities and prefixes

By main city (the city, town or CDP each ZIP shares the most land with), the ones with the most are Flint (7), Burton (3), Beecher (1), Birch Run (1), Burt (1), and Byron (1); 22 places in all.

They start with 3 different three-digit prefixes, one per USPS sorting center: 484, 485, and 487.

Neighboring counties

Each one with its ZIP codes. Those without a page of their own open in the tool.

Tools for this county

ZIP codes by county or city The same ZIP codes on an interactive map, with the list as CSV or to copy County map with cities Its cities, towns and CDPs with their population ZIP codes in a radius The ZIP codes within 10 miles of its center, or any distance you like

Sources

U.S. Census Bureau, 2020 ZCTA to County, ZCTA to Place and ZCTA to Census Tract Relationship Files (and the 2022 County Subdivision to ZCTA file for Connecticut). Public domain.
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table B01003 (population of each ZIP code, census tract and Connecticut town). Public domain.
U.S. Census Bureau, Vintage 2025 Population Estimates (county population) and 2025 Gazetteer Files (land area and interior point of each ZIP code). Public domain.
U.S. Census Bureau, Cartographic Boundary Files: ZCTAs 2020 and counties 2025, 1:500,000; county adjacency file 2025. Public domain.

How we count. ZIP codes here are the Census Bureau’s ZIP Code Tabulation Areas (ZCTAs), the areas it draws to match USPS ZIP codes; ZIPs with no area of their own (PO boxes, single buildings) aren’t included. A ZIP can cross county lines: “Land in the county” is the exact share of its land inside, from the Census relationship files. “Residents in the county” is the whole ZIP for those entirely inside; for shared ones it’s an estimate, spreading the people of each census tract over the land it shares with the ZIP. Population: ACS 2020–2024. Methodology.

Spotted a mistake? Let us know