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🇺🇸 United States ZIP Code

STANDARD

53548

Janesville

ZIP Code 53548 is a standard zip code serving Janesville, Janesville, Wisconsin (WI), in Rock County, United States. It has an estimated population of 18,558 with a median household income of $45,559. The area falls within the America/Chicago timezone.

Median Household Income vs. National Average

$0 National: $37,585 $150K+ $45,559

Location

Country
🇺🇸 United States
State / Province
Wisconsin (WI)
County
Rock
City
Janesville
Timezone
America/Chicago

Coordinates

Latitude
42.685400
Longitude
-89.128700

Geographic Details

Land Area
71.44 mi²
Water Area
0.75 mi²
Population Density
260.0 people per mi² (65th percentile)
Bounding Box
42.788733°N, 42.600360°S, -89.014613°E, -89.249289°W

With 18,558 residents spread across 71.44 square miles, this area has a population density of 260.0 people per square mile.

Demographics

18,558

Population

80th percentile

$45,559

Median Income

40th percentile

$129,400

Median Home Value

50th percentile

71.44 mi²

Land Area

The median household income in 53548 is $45,559, and the median home value is $129,400.

Housing

8,042

Total Units

7,358

Occupied Units

91.5%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Janesville, WI.

53545

Janesville

 53546

Janesville

 53547

Janesville

Similar ZIP Codes in Wisconsin

ZIP codes with similar median household income in Wisconsin.

53007

Butler

$43,631

 53039

Juneau

$52,010

 53046

Lannon

$52,083

 53048

Lomira

$49,767

 53061

New Holstein

$44,625

 53081

Sheboygan

$42,333

 53094

Watertown

$48,951

 53110

Cudahy

$45,929

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.