Residential delivery area · Michigan
ZIP Code 48421: Columbiaville, MI
ZIP code 48421 uses the postal name Columbiaville, Michigan and lies mostly in Lapeer County (95% of its land) with the rest in Genesee County (Census 2020 ZIP-county file). About 6,900 people live there (Census Bureau, ACS 2020-2024). Median household income is $71,114 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Millers Lake (4%), Barnes Lake (3%) and Columbiaville (2%); 91% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Columbiaville · its only residential ZIP
- County
- Lapeer County (95%); Genesee County (5%)
- Census places
- Millers Lake (4%) census-designated place; Barnes Lake (3%) census-designated place; Columbiaville (2%)
- Metro area
- Detroit-Warren-Dearborn, MI
- House districts
- MI-9 (95%), MI-8 (5%) 119th Congress, by share of land
- State
- Michigan
- Time zone
- Eastern
- Land area
- 41.5 sq mi · 167 people per sq mi
Where is ZIP code 48421?
48421 centers on 43.155°, -83.393° and covers 41.5 square miles of land plus 3.1 of water. It borders 6 ZIP codes: 48464, 48463, 48435, 48446, 48461, 48423.
The map draws ZIP code areas only. For the streets inside 48421, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 48421 compare with the rest of Lapeer County?
| Measure | 48421 | In Lapeer County | In MI |
|---|---|---|---|
| People (ACS 2020-2024) | 6,935 | 9th of 21 | 408th of 992 |
| Median household income | $71k | 12th of 18 | 378th of 774 |
| Median home value | $221k | 11th of 19 | 336th of 779 |
Its median household income is higher than in 48% of U.S. residential ZIP codes, and it is denser than 61% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 48421?
The 2020 Census counted 6,656 people in 48421; the ACS, which samples households over 2020-2024, estimates 6,935. Between the 2010 and 2020 censuses its population grew 0.1% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 6,935±956 (90% margin)
- 2020 Census count
- 6,656+0.1% since 2010 (6,647)
- Households
- 2,632
- Median age
- 44.4
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 48421?
Of the 6,935 people the ACS estimates in 48421, 23.3% are under 18 and 20.8% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (97.0%).
- Under 1823.3%
- 18 to 6455.9%
- 65 and older20.8%
- White, not Hispanic97.0%
- Other or two or more1.7%
- Hispanic or Latino1.2%
- Black, not Hispanic0.1%
- Asian, not Hispanic0.0%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 48421 earn?
Median household income is $71,114 (ACS 2020-2024), the 12th highest of the 18 ranked ZIP codes in Lapeer County. It is not measurably different from 2015-2019 ($73,589 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $71,114
- Income per person
- $33,307
- Below the poverty line
- 6.4%
- Unemployed (of the labor force)
- 8.4%
- Adults 25+ with a bachelor's degree
- 20.9%
- Adjusted gross income per tax return, 2022
- $64,8453,240 returns; wages 70% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 48421?
FHFA's house price index for 48421, built from repeat sales and appraisals of the same homes, rose 88% from 2015 to 2025 and rose 46% from 2020 to 2025, and moved +7.1% in 2025.
- Median home value (owners' estimate)
- $220,600
- Median gross rent
- $654
- Homes owned by their occupants
- 88.5%
- Housing units
- 3,049
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 48421?
53 business establishments had a location in this ZIP code in 2023, 4 more than in 2018; the most are in other services (except public administration) (ZIP Code Business Patterns).
- Other services (except public administration)10
- Construction9
- Wholesale trade5
- Retail trade5
- Administrative and support and waste management and remediation services5
- Professional, scientific, and technical services3
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 48421?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 48464 | Otter Lake | 2,152 | $81k | 4.0 mi |
| 48463 | Otisville | 4,393 | $73k | 6.4 mi |
| 48435 | Fostoria | 2,547 | $87k | 6.4 mi |
| 48446 | Lapeer | 30,581 | $66k | 7.5 mi |
| 48461 | North Branch | 7,719 | $79k | 9.8 mi |
| 48423 | Davison | 33,757 | $65k | 10.0 mi |
| 48746 | Millington | 8,222 | $67k | 10.4 mi (near) |
| 48437 | Genesee | 279 | $41k | 11.7 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.