61231 ZIP Code — Aledo, IL

Mercer County, Illinois

ZIP code 61231 is located in Aledo, Illinois, within Mercer County. It covers approximately 153.48 square miles and serves a population of 5,158 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 309.

About ZIP code 61231

The housing stock consists of predominantly single-family detached homes. Most homes were built in the pre-1940, giving the area an established character. Median home value is $130,800. Owner-occupancy sits near the national average at 63%.

Median household income is $59,551. 38% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 24 minutes is near the national average.

College attainment at 19% is below the national average, consistent with a trades and production-oriented local economy.

Overall, ZIP code 61231 reflects a community defined by a trades-oriented workforce and a significant Social Security-dependent population.

5,158

population

153.48

sq mi land

Standard

ZIP type

Central (CT)

timezone

61231 ZIP code map

Cities in ZIP code 61231

Below are the cities the US Postal Service accepts for ZIP code 61231. Using any city not on this list may result in mail delivery delays.

City	Status
Aledo	Acceptable
Aledo	Preferred

Nearby ZIP codes

61486 Viola (7.6 mi) 61279 Reynolds (8.1 mi) 61260 Joy (8.2 mi) 61476 Seaton (11.3 mi) 61465 New Windsor (12.1 mi) 61453 Little York (12.3 mi) 61442 Keithsburg (12.5 mi) 61281 Sherrard (12.8 mi) 61466 North Henderson (13.8 mi) 61284 Taylor Ridge (13.9 mi) 61412 Alexis (14.5 mi) 61264 Milan (15.3 mi)

Demographics updated 05/2026

Population
Total population	5,158
Population density	34 / sq mi
State FIPS	17
County FIPS	131

Geography
Land area	153.48 sq mi
Water area	0.08 sq mi
Latitude	41.1983
Longitude	-90.7224
Timezone	Central (CT)
Area code	309

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	45.3%	42.5%	37.2%
$50k – $100k	35.0%	35.8%	29.6%
$100k – $200k	18.9%	19.6%	24.4%
Over $200k	0.8%	2.1%	8.8%

Demographics & statistics

5,158

Population

People per sq mi

44.3

Median age

$59,551

Median household income

$32,642

Per capita income

$130,800

Median home value

$767

Median monthly rent

62.8%

Home ownership

8.8%

Poverty rate

1.3%

Unemployment

1,654

Housing units

19.3%

Bachelor's or higher

Age distribution

Male Female

145

Under 5

140

151

5–9

146

140

10–14

137

162

15–19

157

159

20–24

155

304

25–34

295

294

35–44

286

293

45–54

284

209

55–59

203

180

60–64

174

331

65–74

322

160

75–84

156

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	1,072	20.8%
18 and over	4,086	79.2%
65 and over	1,144	22.2%
Median age	44.3 years

Race & ethnicity

White 93.8%

Two or more races 1.9%

Black or African American 1.7%

Hispanic or Latino 1.5%

Asian 0.8%

Other race 0.3%

Group	Count	%
White	4,911	93.8%
Two or more races	102	1.9%
Black or African American	87	1.7%
Hispanic or Latino	78	1.5%
Asian	44	0.8%
Other race	14	0.3%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	45.3%	42.5%	37.2%
$50k – $100k	35.0%	35.8%	29.6%
$100k – $200k	18.9%	19.6%	24.4%
Over $200k	0.8%	2.1%	8.8%

Under $10k 3.7%

$10k–$15k 6.8%

$15k–$25k 10.6%

$25k–$35k 5.3%

$35k–$50k 14.1%

$50k–$75k 19.3%

$75k–$100k 15.7%

$100k–$150k 12.9%

$150k–$200k 9.0%

$200k+ 2.6%

Range	% of households
Under $10k	3.7%
$10k–$15k	6.8%
$15k–$25k	10.6%
$25k–$35k	5.3%
$35k–$50k	14.1%
$50k–$75k	19.3%
$75k–$100k	15.7%
$100k–$150k	12.9%
$150k–$200k	9.0%
$200k+	2.6%
Median income	$59,551

Housing

Home values

Under $50k 6.9%

$50k–$100k 24.0%

$100k–$150k 30.1%

$150k–$200k 16.8%

$200k–$300k 20.4%

$300k–$500k 1.3%

$500k–$1M 0.5%

Housing overview

Metric	Value
Median home value	$130,800
Median rent / month	$767
Owner occupied	62.8%
Renter occupied	37.2%
Vacant	11.5%
Single-family detached	78.8%
Large apartment buildings	6.5%
Mobile homes	1.1%
Median rooms	5.6
Avg household size (owned)	2.51

Year built

Era	%
2020 or later	0.3%
2010–2019	3.1%
2000–2009	7.1%
1990–1999	5.6%
1980–1989	5.6%
1970–1979	15.9%
1960–1969	10.3%
1950–1959	10.3%
1940–1949	12.5%
1939 or earlier	29.3%

Bedrooms

Size	% of units
No bedroom (studio)	5.4%
1 bedroom	6.4%
2 bedrooms	28.7%
3 bedrooms	42.7%
4 bedrooms	14.1%
5+ bedrooms	2.7%

Vehicles per household

Vehicles	% of households
No vehicle	7.2%
1 vehicle	27.9%
2 vehicles	34.7%
3 or more	30.2%

Heating fuel

Fuel type	%
Utility gas	62.4%
Electricity	16.2%
Propane / LP gas	16.9%
Fuel oil	1.3%
Wood	2.4%
No fuel used	0.5%

Households & families

Household type	Count	%
Married-couple family	1,186	54.4%
Cohabiting couple	103	4.7%
Male householder, no spouse	303	13.9%
Female householder, no spouse	590	27.0%
Households with children under 18	635	29.1%
Households with seniors (65+)	763	35.0%
Average household size	2.29

Marital status

Status	Male	Female
Never married	32.3%	21.8%
Married	57.3%	58.1%
Separated	0.0%	0.0%
Widowed	5.6%	8.7%
Divorced	4.9%	11.3%

Education

Less than 9th grade 2.1%

Some HS, no diploma 3.3%

HS graduate 35.1%

Some college, no degree 27.1%

Associate's degree 13.1%

Bachelor's degree 13.4%

Graduate / professional 5.9%

Metric	%
HS diploma or higher	94.7%
Bachelor's or higher	19.3%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	60	6.0%
Kindergarten	87	8.7%
Elementary school	421	42.0%
High school	292	29.1%
College / grad school	142	14.2%

Employment

Industry of employment

Education & healthcare 20.2%

Retail trade 14.2%

Manufacturing 12.7%

Construction 9.7%

Finance & real estate 7.2%

Arts, food & hospitality 7.1%

Transportation & utilities 6.9%

Public administration 5.5%

Other services 5.3%

Professional & management 4.4%

Agriculture & mining 4.3%

Wholesale trade 1.6%

Information 0.9%

Occupation

Category	%
Management, business & arts	28.6%
Service	20.2%
Sales & office	18.1%
Natural resources & construction	15.0%
Production & transportation	18.1%

Employment type

Type	%
Private sector	79.3%
Government	13.6%
Self-employed	6.5%
Unpaid family workers	0.6%

Commute

Method	%
Drive alone	87.7%
Carpool	5.2%
Public transit	0.0%
Walk	2.4%
Work from home	4.7%
Other means	0.0%
Avg commute (minutes)	23.6

Poverty

All people 8.8%

Under 18 years 9.0%

18 and over 8.8%

Married-couple families 4.7%

Female-led households 6.2%

Income support

Source	% of households
Social Security	37.5%
Retirement income	26.5%
Supplemental Security	3.5%
Cash public assistance	1.1%
Food stamps / SNAP	12.9%

Health indicators

Condition	%
Obesity	35.0%
High blood pressure	36.3%
High cholesterol	35.3%
Diabetes	10.9%
Heart disease	8.0%
Stroke	3.6%
Asthma	9.5%
Arthritis	30.3%
Kidney disease	3.3%
Pulmonary disease	8.1%
Cancer	8.6%

Behavior / access	%
Smoking	17.5%
Binge drinking	14.2%
No physical activity	26.2%
Less than 7 hrs sleep	31.0%
Depression	17.0%
Fair or poor health	14.9%
Poor mental health	12.2%
Poor physical health	10.5%
No health insurance	10.1%
Visited doctor (checkup)	77.8%
Visited dentist	62.2%
Cholesterol screening	91.0%
Teeth loss	14.6%

Veterans & disability

Veterans	Count	%
Civilian veterans	347	8.5%

Disability	%
Any disability	14.3%
Under 18	3.0%
18–64 years	11.0%
65 and over	34.3%

Health insurance coverage

Type	%
Private insurance	72.4%
Public insurance	37.9%
No insurance	3.7%
Uninsured under 19	3.7%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	4,873	94.5%
Spanish	75	1.5%
Other Indo-European	42	0.9%
Asian & Pacific Islander	11	0.2%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	5,095	98.8%
Born in same state	5,071	98.3%
Born in different state	3,784	73.4%
Foreign born	24	0.5%
Naturalized citizen	63	1.2%
Not a US citizen	63	100.0%

Ancestry

Ancestry	Count	%
Italian	508	9.8%
French	438	8.5%
Arab	221	4.3%
English	55	1.1%

Ancestry	Count	%
Dutch	38	0.7%
German	16	0.3%
Polish	16	0.3%

Technology access

Metric	% of households
Computer access	42.3%
Internet access	89.1%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 61231

What city is ZIP code 61231 in?

ZIP code 61231 is primarily assigned to Aledo, Illinois.

What county is ZIP code 61231 in?

ZIP code 61231 falls within Mercer County, Illinois.

Does ZIP code 61231 have a large retiree population?

38% of households in ZIP code 61231 receive Social Security income, suggesting a significant retiree or disability population.

What is the typical home value in ZIP code 61231?

The median home value in ZIP code 61231 is $130,800.

What is the population of ZIP code 61231?

ZIP code 61231 has an estimated population of 5,158 residents, with a density of 34 people per square mile.

What is the median household income in ZIP code 61231?

The median household income in ZIP code 61231 is $59,551, below the national median of ~$75,000.

What timezone is ZIP code 61231 in?

ZIP code 61231 observes the CST timezone.