What city is ZIP code 61231?

ZIP code 61231 is in Aledo, IL (Mercer County).

What county is ZIP code 61231 in?

ZIP code 61231 is mostly in Mercer County, Illinois.

How many people live in ZIP code 61231?

About 4,962 people live in the 61231 ZIP Code Tabulation Area, based on American Community Survey 5-year estimates.

Checked Oct 26, 2026

ZIP Code 61231

Aledo, IL, Mercer County

Population

4,962

Land area

153.5sq mi

People per sq mi

City

Aledo

ZIP 61231 and nearby ZIP codes

Full map

ZIP 61231 at a glance

ZIP 61231 (Aledo) is 86% less dense than Illinois as a whole.
Households here earn a median of $70,991 a year, 15% less than the Illinois figure of $83,390.
A typical owner-occupied home is valued at $147,600 (44% below Illinois) and median rent is $815 a month.

Local data for ZIP 61231

Counts from official public data

Housing and community stats

ZIP 61231, American Community Survey 2020-2024

Full profile

Median household income

$70,991

Poverty rate

11.5%

Median home value

$147,600

Prices +6.1% in a year

Median rent

$815/mo

Homeownership

72.2%

Bachelor's or higher

25.3%

Median age

42.2

Average commute

21.3 min

Income, education and commute

Economy and federal money

Businesses, pandemic loans and political donations

Details

Business establishments

156

ZIP Business Patterns 2023

Employees

1,696

$72M annual payroll

PPP loans

$12M

326 loans

Campaign donations

$11.5K

9% D, 68% R, 2026 cycle

PPP loans in this ZIP

Environment and hazard risk

ZIP 61231, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Very Low

Top: drought

Storm events since 1996

470

Countywide, mostly thunderstorm wind

Flood insurance policies

0.3% of homes, county

July high / Jan low

85° / 13°F

39.1 inches of rain a year

Hazards, floods and storm history Check a flood zone

Health statistics

Share of adults in ZIP 61231, CDC PLACES estimates

All 40 measures

Obesity

39.0%

U.S. 33.3% +5.7 pts

Diabetes

13.7%

U.S. 12.1% +1.6 pts

Smoking

15.4%

U.S. 12.8% +2.6 pts

Uninsured (18-64)

7.6%

U.S. 11.1% -3.5 pts

Frequently asked questions

What city is ZIP code 61231?: ZIP code 61231 is in Aledo, IL (Mercer County).
What county is ZIP code 61231 in?: ZIP code 61231 is mostly in Mercer County, Illinois.
How many people live in ZIP code 61231?: About 4,962 people live in the 61231 ZIP Code Tabulation Area, based on American Community Survey 5-year estimates.

Source: U.S. Census Bureau (ZIP Code Tabulation Areas, American Community Survey) · Data as of 12/31/2023. ZIP Code Tabulation Areas closely match, but are not identical to, USPS ZIP code delivery areas.