🇺🇸 United States ZIP Code

STANDARD

48191

Willis

ZIP Code 48191 is a standard zip code serving Willis, Willis, Michigan (MI), in Washtenaw County, United States. It has an estimated population of 4,054 with a median household income of $72,204. The area falls within the America/Detroit timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Michigan (MI)
County: Washtenaw
City: Willis
Timezone: America/Detroit

Coordinates

Latitude: 42.129200
Longitude: -83.568700

Geographic Details

Land Area: 16.27 mi²
Water Area: 0.06 mi²
Population Density: 249.0 people per mi² (65th percentile)
Bounding Box: 42.174344°N, 42.056620°S, -83.538626°E, -83.599790°W

With 4,054 residents spread across 16.27 square miles, this area has a population density of 249.0 people per square mile.

Demographics

4,054

Population

50th percentile

$72,204

Median Income

85th percentile

$157,100

Median Home Value

60th percentile

16.27 mi²

Land Area

The median household income in 48191 is $72,204, and the median home value is $157,100. This places the area in the top 25% nationally for household income.

Housing

1,603

Total Units

1,476

Occupied Units

92.1%

Occupancy Rate

Similar ZIP Codes in Michigan

ZIP codes with similar median household income in Michigan.

48623

Freeland

$67,509

48329

Waterford

$66,765

48854

Mason

$63,552

48182

Temperance

$64,076

48145

La Salle

$66,714

48383

White Lake

$68,136

49302

Alto

$75,616

48371

Oxford

$76,419

Frequently Asked Questions

What information is available for each ZIP code?

Each ZIP code page shows city, state, county, geographic coordinates, timezone, population, median household income, median home value, housing units, land area, population density, commute time, educational attainment, area codes, and ZIP code type (Standard, PO Box, or Unique).

What are the different types of ZIP codes?

There are three types of ZIP codes: Standard (residential and commercial delivery areas), PO Box (assigned to post office box sections), and Unique (assigned to a single high-volume address like a government agency or large company). Standard ZIP codes are the most common.

How often is ZIP code data updated?

ZIP code assignments are updated quarterly by the USPS. Demographic data comes from the US Census Bureau's American Community Survey (ACS), which releases new 5-year estimates annually. ZipFYI updates its data to reflect the latest available information.

What is population density and why does it matter?

Population density measures the number of people per square mile in a ZIP code area. It helps identify urban vs. rural areas, affects real estate values, impacts service availability, and is used in market analysis. Dense urban ZIP codes may have 50,000+ people per square mile.

How are ZIP code boundaries determined?

ZIP code boundaries are determined by the USPS based on mail delivery routes, not political or geographic boundaries. They follow carrier routes and may cross city, county, or even state lines. Boundaries can change when the USPS reorganizes delivery operations.

What does median household income tell me about a ZIP code?

Median household income is the middle value when all household incomes in a ZIP code are sorted. Half of households earn more and half earn less. It is a better indicator of typical earnings than average income, which can be skewed by very high or very low outliers.