Residential delivery area · Michigan
ZIP Code 48178: South Lyon, MI
ZIP code 48178 uses the postal name South Lyon, Michigan and lies mostly in Oakland County (36% of its land), reaching into Washtenaw County and Livingston County (Census 2020 ZIP-county file). About 38,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $131,558 (Census Bureau, ACS 2020-2024). By Census place, 8% of its land lies in South Lyon, and 2% in smaller places; 90% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- South Lyon · its only residential ZIP
- County
- Oakland County (36%); Washtenaw County (34%); Livingston County (29%)
- Census places
- South Lyon
- Metro area
- Detroit-Warren-Dearborn, MI
- House districts
- MI-7 (66%), MI-6 (34%) 119th Congress, by share of land
- State
- Michigan
- Time zone
- Eastern
- Land area
- 48.0 sq mi · 788 people per sq mi
Where is ZIP code 48178?
48178 centers on 42.444°, -83.657° and covers 48.0 square miles of land plus 1.7 of water. It borders 9 ZIP codes: 48165, 48168, 48167, 48189, 48374, 48116, 48393, 48170, 48105.
The map draws ZIP code areas only. For the streets inside 48178, 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 48178 compare with the rest of Oakland County?
| Measure | 48178 | In Oakland County | In MI |
|---|---|---|---|
| People (ACS 2020-2024) | 37,789 | 4th of 71 | 48th of 992 |
| Median household income | $132k | 18th of 70 | 22nd of 774 |
| Median home value | $411k | 22nd of 71 | 41st of 779 |
Its median household income is higher than in 93% of U.S. residential ZIP codes, and it is denser than 76% 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 48178?
The 2020 Census counted 36,858 people in 48178; the ACS, which samples households over 2020-2024, estimates 37,789. Between the 2010 and 2020 censuses its population grew 25.7% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 37,789
- 2020 Census count
- 36,858+25.7% since 2010 (29,320)
- Households
- 13,953
- Median age
- 42.9
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 48178?
Of the 37,789 people the ACS estimates in 48178, 23.5% are under 18 and 17.4% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (86.9%).
- Under 1823.5%
- 18 to 6459.0%
- 65 and older17.4%
- White, not Hispanic86.9%
- Other or two or more4.2%
- Asian, not Hispanic4.2%
- Hispanic or Latino2.8%
- Black, not Hispanic1.9%
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 48178 earn?
Median household income is $131,558 (ACS 2020-2024), the 18th highest of the 70 ranked ZIP codes in Oakland County. It is not measurably different from 2015-2019 ($123,254 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $131,558
- Income per person
- $62,142
- Below the poverty line
- 3.9%
- Unemployed (of the labor force)
- 3.2%
- Adults 25+ with a bachelor's degree
- 54.4%
- Adjusted gross income per tax return, 2022
- $124,43818,890 returns; wages 71% 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 48178?
FHFA's house price index for 48178, built from repeat sales and appraisals of the same homes, rose 80% from 2015 to 2025 and rose 45% from 2020 to 2025, and moved +5.1% in 2025.
- Median home value (owners' estimate)
- $410,500
- Median gross rent
- $1,336
- Homes owned by their occupants
- 91.2%
- Housing units
- 14,397
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 48178?
632 business establishments had a location in this ZIP code in 2023, 28 more than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction100
- Health care and social assistance82
- Professional, scientific, and technical services81
- Other services (except public administration)68
- Retail trade65
- Accommodation and food services45
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 48178?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 48165 | New Hudson | 9,566 | $106k | 4.2 mi |
| 48168 | Northville | 25,038 | $188k | 6.5 mi |
| 48167 | Northville | 24,713 | $125k | 6.8 mi |
| 48189 | Whitmore Lake | 13,893 | $87k | 6.8 mi |
| 48374 | Novi | 17,672 | $183k | 7.3 mi |
| 48116 | Brighton | 27,289 | $107k | 7.7 mi |
| 48393 | Wixom | 20,145 | $66k | 7.8 mi |
| 48170 | Plymouth | 40,076 | $114k | 8.2 mi |
| 48105 | Ann Arbor | 37,048 | $95k | 8.3 mi |
| 48139 | Hamburg | 96 | $47k | 7.7 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.