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🇺🇸 United States ZIP Code

STANDARD

53545

Janesville

ZIP Code 53545 is a standard zip code serving Janesville, Janesville, Wisconsin (WI), in Rock County, United States. It has an estimated population of 23,117 with a median household income of $45,830. The area falls within the America/Chicago timezone.

Median Household Income vs. National Average

$0 National: $37,585 $150K+ $45,830

Location

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

Coordinates

Latitude
42.735500
Longitude
-89.040500

Geographic Details

Land Area
24.78 mi²
Water Area
0.43 mi²
Population Density
933.0 people per mi² (75th percentile)
Bounding Box
42.788876°N, 42.666408°S, -88.954071°E, -89.120848°W

With 23,117 residents spread across 24.78 square miles, this area has a population density of 933.0 people per square mile.

Demographics

23,117

Population

80th percentile

$45,830

Median Income

45th percentile

$131,500

Median Home Value

50th percentile

24.78 mi²

Land Area

The median household income in 53545 is $45,830, and the median home value is $131,500.

Housing

10,484

Total Units

9,613

Occupied Units

91.7%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Janesville, WI.

53546

Janesville

 53547

Janesville

 53548

Janesville

Similar ZIP Codes in Wisconsin

ZIP codes with similar median household income in Wisconsin.

53007

Butler

$43,631

 53019

Eden

$52,417

 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

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.