Residential delivery area · Michigan
ZIP Code 48191: Willis, MI
ZIP code 48191 uses the postal name Willis, Michigan and lies mostly in Washtenaw County (88% of its land) with the rest in Monroe County (Census 2020 ZIP-county file). About 4,400 people live there (Census Bureau, ACS 2020-2024). Median household income is $102,833 (Census Bureau, ACS 2020-2024). Its land lies outside any incorporated or census-designated place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Willis · its only residential ZIP
- County
- Washtenaw County (88%); Monroe County (12%)
- Metro area
- Ann Arbor, MI
- House districts
- MI-6 (88%), MI-5 (12%) 119th Congress, by share of land
- State
- Michigan
- Time zone
- Eastern
- Land area
- 16.1 sq mi · 273 people per sq mi
Where is ZIP code 48191?
48191 centers on 42.121°, -83.566° and covers 16.1 square miles of land plus 0.1 of water. It borders 6 ZIP codes: 48190, 48111, 48197, 48160, 48159, 48117.
The map draws ZIP code areas only. For the streets inside 48191, 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 48191 compare with the rest of Washtenaw County?
| Measure | 48191 | In Washtenaw County | In MI |
|---|---|---|---|
| People (ACS 2020-2024) | 4,403 | 23rd of 27 | 504th of 992 |
| Median household income | $103k | 10th of 24 | 87th of 774 |
| Median home value | $272k | 18th of 25 | 197th of 779 |
Its median household income is higher than in 83% of U.S. residential ZIP codes, and it is denser than 66% 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 48191?
The 2020 Census counted 3,980 people in 48191; the ACS, which samples households over 2020-2024, estimates 4,403. Between the 2010 and 2020 censuses its population fell 1.8% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 4,403±587 (90% margin)
- 2020 Census count
- 3,980−1.8% since 2010 (4,054)
- Households
- 1,662
- Median age
- 47.2
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 48191?
Of the 4,403 people the ACS estimates in 48191, 17.9% are under 18 and 18.2% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (76.7%), then Other or two or more (13.4%).
- Under 1817.9%
- 18 to 6463.9%
- 65 and older18.2%
- White, not Hispanic76.7%
- Other or two or more13.4%
- Black, not Hispanic8.4%
- Hispanic or Latino1.0%
- Asian, not Hispanic0.6%
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 48191 earn?
Median household income is $102,833 (ACS 2020-2024), the 10th highest of the 24 ranked ZIP codes in Washtenaw County. It is not measurably different from 2015-2019 ($88,045 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $102,833±$14,172
- Income per person
- $51,915
- Below the poverty line
- 9.4%
- Unemployed (of the labor force)
- 2.8%
- Adults 25+ with a bachelor's degree
- 24.4%
- Adjusted gross income per tax return, 2022
- $71,3111,920 returns; wages 68% 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 48191?
FHFA's house price index for 48191, built from repeat sales and appraisals of the same homes, rose 99% from 2015 to 2025 and rose 44% from 2020 to 2025, and moved +15.8% in 2025.
- Median home value (owners' estimate)
- $271,900
- Median gross rent
- $1,387
- Homes owned by their occupants
- 90.9%
- Housing units
- 1,708
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 48191?
46 business establishments had a location in this ZIP code in 2023, 5 more than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction19
- Professional, scientific, and technical services7
- Retail trade6
- Other services (except public administration)5
- Accommodation and food 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 48191?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 48190 | Whittaker | 76 | $77k | 2.1 mi |
| 48111 | Belleville | 44,709 | $77k | 5.8 mi |
| 48197 | Ypsilanti | 66,525 | $74k | 6.3 mi |
| 48160 | Milan | 13,972 | $104k | 6.4 mi |
| 48159 | Maybee | 2,578 | $75k | 6.7 mi |
| 48117 | Carleton | 10,262 | $79k | 9.4 mi |
| 48164 | New Boston | 9,576 | $108k | 8.7 mi (near) |
| 48198 | Ypsilanti | 39,244 | $63k | 10.7 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.