🇺🇸 United States ZIP Code

STANDARD

61104

Rockford

ZIP Code 61104 is a standard zip code serving Rockford, Rockford, Illinois (IL), in Winnebago County, United States. It has an estimated population of 19,269 with a median household income of $23,088. The area falls within the America/Chicago timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Illinois (IL)
County: Winnebago
City: Rockford
Timezone: America/Chicago

Coordinates

Latitude: 42.255400
Longitude: -89.076800

Geographic Details

Land Area: 4.51 mi²
Water Area: 0.06 mi²
Population Density: 4272.0 people per mi² (90th percentile)
Bounding Box: 42.270305°N, 42.236020°S, -89.056188°E, -89.106379°W

With 19,269 residents spread across 4.51 square miles, this area has a population density of 4272.0 people per square mile.

Demographics

19,269

Population

80th percentile

$23,088

Median Income

$71,800

Median Home Value

10th percentile

4.51 mi²

Land Area

The median household income in 61104 is $23,088, and the median home value is $71,800.

Housing

9,013

Total Units

7,489

Occupied Units

83.1%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Rockford, IL.

61101

Rockford

61102

Rockford

61103

Rockford

61105

Rockford

61106

Rockford

61107

Rockford

61108

Rockford

61109

Rockford

61110

Rockford

61112

Rockford

Similar ZIP Codes in Illinois

ZIP codes with similar median household income in Illinois.

60644

Chicago

$26,092

60653

Chicago

$24,968

61602

Peoria

$25,875

61605

Peoria

$19,442

62901

Carbondale

$20,995

60958

Pembroke Township

$22,384

62205

East Saint Louis

$22,054

62982

Rosiclare

$20,486

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.