🇺🇸 United States ZIP Code

STANDARD

61259

Illinois City

ZIP Code 61259 is a standard zip code serving Illinois City, Illinois City, Illinois (IL), in Rock Island County, United States. It has an estimated population of 1,276 with a median household income of $64,489. The area falls within the America/Chicago timezone.

Median Household Income vs. National Average

Location

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

Coordinates

Latitude: 41.389200
Longitude: -90.892500

Geographic Details

Land Area: 76.43 mi²
Water Area: 8.03 mi²
Population Density: 17.0 people per mi² (20th percentile)
Bounding Box: 41.455623°N, 41.331899°S, -90.779529°E, -91.072070°W

With 1,276 residents spread across 76.43 square miles, this area has a population density of 17.0 people per square mile.

Demographics

1,276

Population

30th percentile

$64,489

Median Income

75th percentile

$161,500

Median Home Value

60th percentile

76.43 mi²

Land Area

The median household income in 61259 is $64,489, and the median home value is $161,500. This places the area in the top 25% nationally for household income.

Housing

533

Total Units

501

Occupied Units

94.0%

Occupancy Rate

Similar ZIP Codes in Illinois

ZIP codes with similar median household income in Illinois.

60478

Country Club Hills

$60,157

61741

Forrest

$56,071

61319

Cornell

$61,897

61913

Atwood

$56,000

60610

Chicago

$72,636

60074

Palatine

$62,006

60421

Elwood

$70,485

62558

Pawnee

$65,363

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.