61031 ZIP Code — Franklin Grove, IL

Lee County, Illinois

ZIP code 61031 is located in Franklin Grove, Illinois, within Lee County. It covers approximately 44.93 square miles and serves a population of 1,745 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 815.

About ZIP code 61031

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 $126,500. Owner-occupancy sits near the national average at 69%.

Median household income is $72,639. The poverty rate of 6% is below the national average. 40% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is production, transportation, and material moving, with manufacturing as the leading industry. The average commute of 32 minutes is near the national average.

Educational attainment is near the national average, with 22% of residents holding a bachelor's degree or higher.

1,745

population

44.93

sq mi land

Standard

ZIP type

Central (CT)

timezone

61031 ZIP code map

Cities in ZIP code 61031

Below are the cities the US Postal Service accepts for ZIP code 61031. Using any city not on this list may result in mail delivery delays.

City	Status
Franklin Grove	Acceptable
Franklin Grove	Preferred

Nearby ZIP codes

61006 Ashton (5.9 mi) 61021 Dixon (9.4 mi) 61310 Amboy (9.7 mi) 61378 West Brooklyn (10.7 mi) 61061 Oregon (11.7 mi) 61015 Chana (12 mi) 61318 Compton (13.8 mi) 61367 Sublette (14.3 mi) 60553 Steward (14.5 mi) 61068 Rochelle (15.7 mi) 61042 Harmon (16.3 mi) 61054 Mount Morris (16.4 mi)

Demographics updated 05/2026

Population
Total population	1,745
Population density	39 / sq mi
State FIPS	17
County FIPS	103

Geography
Land area	44.93 sq mi
Water area	0.02 sq mi
Latitude	41.8375
Longitude	-89.3037
Timezone	Central (CT)
Area code	815

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	53.4%	43.1%	37.2%
$50k – $100k	31.6%	33.4%	29.6%
$100k – $200k	12.0%	19.8%	24.4%
Over $200k	3.0%	3.8%	8.8%

Demographics & statistics

1,745

Population

People per sq mi

42.7

Median age

$72,639

Median household income

$29,703

Per capita income

$126,500

Median home value

$817

Median monthly rent

69.2%

Home ownership

5.9%

Poverty rate

1.2%

Unemployment

461

Housing units

21.8%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

15–19

20–24

25–34

122

35–44

140

45–54

105

55–59

60–64

65–74

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	348	19.9%
18 and over	1,397	80.1%
65 and over	378	21.7%
Median age	42.7 years

Race & ethnicity

White 77.5%

Two or more races 11.3%

Hispanic or Latino 11.1%

Asian 0.1%

Other race 0.1%

Group	Count	%
White	1,520	77.5%
Two or more races	222	11.3%
Hispanic or Latino	217	11.1%
Asian	2	0.1%
Other race	1	0.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	53.4%	43.1%	37.2%
$50k – $100k	31.6%	33.4%	29.6%
$100k – $200k	12.0%	19.8%	24.4%
Over $200k	3.0%	3.8%	8.8%

Under $10k 4.7%

$10k–$15k 1.5%

$15k–$25k 11.0%

$25k–$35k 11.6%

$35k–$50k 7.3%

$50k–$75k 16.8%

$75k–$100k 18.5%

$100k–$150k 18.5%

$150k–$200k 8.7%

$200k+ 1.5%

Range	% of households
Under $10k	4.7%
$10k–$15k	1.5%
$15k–$25k	11.0%
$25k–$35k	11.6%
$35k–$50k	7.3%
$50k–$75k	16.8%
$75k–$100k	18.5%
$100k–$150k	18.5%
$150k–$200k	8.7%
$200k+	1.5%
Median income	$72,639

Housing

Home values

Under $50k 2.8%

$50k–$100k 34.5%

$100k–$150k 21.7%

$150k–$200k 19.8%

$200k–$300k 8.9%

$300k–$500k 11.7%

$500k–$1M 0.7%

Housing overview

Metric	Value
Median home value	$126,500
Median rent / month	$817
Owner occupied	69.2%
Renter occupied	30.8%
Vacant	4.9%
Single-family detached	78.7%
Large apartment buildings	7.7%
Mobile homes	6.9%
Median rooms	6.0
Avg household size (owned)	2.75

Year built

Era	%
2020 or later	0.0%
2010–2019	1.7%
2000–2009	3.4%
1990–1999	12.3%
1980–1989	12.7%
1970–1979	11.0%
1960–1969	5.7%
1950–1959	7.5%
1940–1949	7.5%
1939 or earlier	38.2%

Bedrooms

Size	% of units
No bedroom (studio)	2.9%
1 bedroom	7.2%
2 bedrooms	18.3%
3 bedrooms	50.3%
4 bedrooms	19.9%
5+ bedrooms	1.4%

Vehicles per household

Vehicles	% of households
No vehicle	6.8%
1 vehicle	27.1%
2 vehicles	38.9%
3 or more	27.3%

Heating fuel

Fuel type	%
Utility gas	59.4%
Electricity	23.2%
Propane / LP gas	17.4%

Households & families

Household type	Count	%
Married-couple family	271	43.7%
Cohabiting couple	44	7.1%
Male householder, no spouse	163	26.3%
Female householder, no spouse	142	22.9%
Households with children under 18	173	27.9%
Households with seniors (65+)	202	32.6%
Average household size	2.65

Marital status

Status	Male	Female
Never married	37.6%	33.9%
Married	44.9%	39.7%
Separated	5.3%	0.0%
Widowed	6.1%	17.1%
Divorced	6.0%	9.4%

Education

Less than 9th grade 1.0%

Some HS, no diploma 5.4%

HS graduate 41.6%

Some college, no degree 19.3%

Associate's degree 10.9%

Bachelor's degree 18.0%

Graduate / professional 3.9%

Metric	%
HS diploma or higher	93.6%
Bachelor's or higher	21.8%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	12	3.1%
Kindergarten	8	2.1%
Elementary school	216	55.4%
High school	66	16.9%
College / grad school	88	22.6%

Employment

Industry of employment

Manufacturing 23.9%

Education & healthcare 19.1%

Retail trade 13.4%

Arts, food & hospitality 7.2%

Construction 6.9%

Transportation & utilities 6.5%

Public administration 5.1%

Finance & real estate 4.4%

Professional & management 4.4%

Wholesale trade 3.1%

Other services 2.9%

Agriculture & mining 2.4%

Information 0.7%

Occupation

Category	%
Management, business & arts	28.3%
Service	9.8%
Sales & office	21.3%
Natural resources & construction	10.9%
Production & transportation	29.7%

Employment type

Type	%
Private sector	83.0%
Government	12.0%
Self-employed	5.1%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	83.0%
Carpool	4.9%
Public transit	0.0%
Walk	2.0%
Work from home	5.7%
Other means	4.4%
Avg commute (minutes)	31.7

Poverty

All people 5.9%

Under 18 years 4.3%

18 and over 6.4%

Married-couple families 8.1%

Female-led households 1.7%

Income support

Source	% of households
Social Security	39.5%
Retirement income	19.7%
Supplemental Security	4.4%
Cash public assistance	2.3%
Food stamps / SNAP	13.2%

Health indicators

Condition	%
Obesity	33.5%
High blood pressure	35.3%
High cholesterol	35.0%
Diabetes	10.6%
Heart disease	7.7%
Stroke	3.5%
Asthma	9.4%
Arthritis	29.1%
Kidney disease	3.2%
Pulmonary disease	7.7%
Cancer	8.5%

Behavior / access	%
Smoking	16.8%
Binge drinking	14.2%
No physical activity	24.9%
Less than 7 hrs sleep	30.6%
Depression	17.0%
Fair or poor health	14.3%
Poor mental health	12.1%
Poor physical health	10.2%
No health insurance	10.0%
Visited doctor (checkup)	78.0%
Visited dentist	67.4%
Cholesterol screening	90.8%
Teeth loss	14.1%

Veterans & disability

Veterans	Count	%
Civilian veterans	122	8.7%

Disability	%
Any disability	16.2%
Under 18	0.9%
18–64 years	14.9%
65 and over	39.4%

Health insurance coverage

Type	%
Private insurance	75.5%
Public insurance	35.2%
No insurance	5.4%
Uninsured under 19	2.1%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	1,692	97.0%
Spanish	15	0.9%
Other Indo-European	13	0.8%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	1,709	97.9%
Born in same state	1,695	97.1%
Born in different state	1,383	79.3%
Foreign born	14	0.8%
Naturalized citizen	36	2.1%
Not a US citizen	32	88.9%

Ancestry

Ancestry	Count	%
Italian	277	15.9%
French	101	5.8%
Arab	59	3.4%
Polish	32	1.8%

Ancestry	Count	%
English	28	1.6%
German	16	0.9%
Dutch	3	0.2%

Technology access

Metric	% of households
Computer access	35.5%
Internet access	87.1%

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

Frequently asked questions about ZIP code 61031

What city is ZIP code 61031 in?

ZIP code 61031 is primarily assigned to Franklin Grove, Illinois.

What county is ZIP code 61031 in?

ZIP code 61031 falls within Lee County, Illinois.

Does ZIP code 61031 have a large retiree population?

40% of households in ZIP code 61031 receive Social Security income, suggesting a significant retiree or disability population.

What is the typical home value in ZIP code 61031?

The median home value in ZIP code 61031 is $126,500.

What is the population of ZIP code 61031?

ZIP code 61031 has an estimated population of 1,745 residents, with a density of 39 people per square mile.

What is the median household income in ZIP code 61031?

The median household income in ZIP code 61031 is $72,639, below the national median of ~$75,000.

What timezone is ZIP code 61031 in?

ZIP code 61031 observes the CST timezone.