🇺🇸 United States ZIP Code

STANDARD

61570

Washburn

ZIP Code 61570 is a standard zip code serving Washburn, Washburn, Illinois (IL), in Marshall County, United States. It has an estimated population of 1,879 with a median household income of $57,303. The area falls within the America/Chicago timezone.

Median Household Income vs. National Average

Location

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

Coordinates

Latitude: 40.914100
Longitude: -89.283000

Geographic Details

Land Area: 66.57 mi²
Water Area: 4.90 mi²
Population Density: 28.0 people per mi² (25th percentile)
Bounding Box: 40.983890°N, 40.851309°S, -89.166800°E, -89.497514°W

With 1,879 residents spread across 66.57 square miles, this area has a population density of 28.0 people per square mile.

Demographics

1,879

Population

40th percentile

$57,303

Median Income

65th percentile

$103,900

Median Home Value

35th percentile

66.57 mi²

Land Area

The median household income in 61570 is $57,303, and the median home value is $103,900.

Housing

775

Total Units

719

Occupied Units

92.8%

Occupancy Rate

Similar ZIP Codes in Illinois

ZIP codes with similar median household income in Illinois.

61025

East Dubuque

$56,960

60656

Chicago

$54,134

62638

Franklin

$55,278

61565

Sparland

$56,750

61031

Franklin Grove

$49,667

61115

Machesney Park

$53,094

61614

Peoria

$59,920

60645

Chicago

$48,918

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.