61261 ZIP Code — Lyndon, IL

Whiteside County, Illinois

ZIP code 61261 is located in Lyndon, Illinois, within Whiteside County. It covers approximately 16.56 square miles and serves a population of 644 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 815.

About ZIP code 61261

The housing stock consists of a higher-than-average concentration of mobile homes. Most homes were built in the pre-1940, giving the area an established character. Median home value is $111,000. Owner-occupancy is high at 79%, well above the national average.

Median household income is $50,441. The poverty rate of 5% is below the national average. 45% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with manufacturing as the leading industry. The average commute of 30 minutes is near the national average.

College attainment at 12% is below the national average, consistent with a trades and production-oriented local economy.

Notable community characteristics include a notable veteran presence at 13% of civilians, above the national average of 7%.

Overall, ZIP code 61261 reflects a community defined by a trades-oriented workforce, a strong veteran community, high homeownership, and a significant Social Security-dependent population.

644

population

16.56

sq mi land

Standard

ZIP type

Central (CT)

timezone

61261 ZIP code map

Cities in ZIP code 61261

Below are the cities the US Postal Service accepts for ZIP code 61261. Using any city not on this list may result in mail delivery delays.

City	Status
Lyndon	Preferred

Nearby ZIP codes

61251 Fenton (7.4 mi) 61270 Morrison (7.4 mi) 61277 Prophetstown (8.2 mi) 61250 Erie (9.7 mi) 61071 Rock Falls (10.3 mi) 61081 Sterling (11.8 mi) 61283 Tampico (12.2 mi) 61252 Fulton (12.7 mi) 61243 Deer Grove (13.9 mi) 61230 Albany (14.9 mi) 52736 Clinton (15.9 mi) 52771 Teeds Grove (15.9 mi)

Demographics updated 05/2026

Population
Total population	644
Population density	39 / sq mi
State FIPS	17
County FIPS	195

Geography
Land area	16.56 sq mi
Water area	0.29 sq mi
Latitude	41.7286
Longitude	-89.9217
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	59.4%	43.7%	37.2%
$50k – $100k	22.3%	32.3%	29.6%
$100k – $200k	17.9%	20.7%	24.4%
Over $200k	0.3%	3.3%	8.8%

Demographics & statistics

644

Population

People per sq mi

49.1

Median age

$50,441

Median household income

$30,458

Per capita income

$111,000

Median home value

$1,144

Median monthly rent

79.3%

Home ownership

5.1%

Poverty rate

7.3%

Unemployment

323

Housing units

11.7%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

15–19

20–24

25–34

35–44

45–54

55–59

60–64

65–74

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	100	15.5%
18 and over	544	84.5%
65 and over	162	25.2%
Median age	49.1 years

Race & ethnicity

White 88.8%

Two or more races 5.5%

Hispanic or Latino 4.9%

Black or African American 0.7%

Asian 0.1%

Group	Count	%
White	601	88.8%
Two or more races	37	5.5%
Hispanic or Latino	33	4.9%
Black or African American	5	0.7%
Asian	1	0.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	59.4%	43.7%	37.2%
$50k – $100k	22.3%	32.3%	29.6%
$100k – $200k	17.9%	20.7%	24.4%
Over $200k	0.3%	3.3%	8.8%

Under $10k 5.2%

$10k–$15k 0.7%

$15k–$25k 9.0%

$25k–$35k 19.7%

$35k–$50k 14.5%

$50k–$75k 20.0%

$75k–$100k 13.1%

$100k–$150k 6.2%

$150k–$200k 11.7%

Range	% of households
Under $10k	5.2%
$10k–$15k	0.7%
$15k–$25k	9.0%
$25k–$35k	19.7%
$35k–$50k	14.5%
$50k–$75k	20.0%
$75k–$100k	13.1%
$100k–$150k	6.2%
$150k–$200k	11.7%
Median income	$50,441

Housing

Home values

Under $50k 16.1%

$50k–$100k 23.0%

$100k–$150k 37.8%

$150k–$200k 8.7%

$200k–$300k 10.4%

$300k–$500k 3.9%

Housing overview

Metric	Value
Median home value	$111,000
Median rent / month	$1,144
Owner occupied	79.3%
Renter occupied	20.7%
Vacant	24.3%
Single-family detached	68.1%
Large apartment buildings	0.0%
Mobile homes	23.8%
Median rooms	5.9
Avg household size (owned)	2.03

Year built

Era	%
2020 or later	0.0%
2010–2019	0.0%
2000–2009	1.0%
1990–1999	8.9%
1980–1989	20.6%
1970–1979	20.6%
1960–1969	11.2%
1950–1959	12.0%
1940–1949	4.7%
1939 or earlier	20.9%

Bedrooms

Size	% of units
No bedroom (studio)	0.5%
1 bedroom	6.8%
2 bedrooms	31.9%
3 bedrooms	47.5%
4 bedrooms	11.2%
5+ bedrooms	2.1%

Vehicles per household

Vehicles	% of households
No vehicle	3.8%
1 vehicle	25.2%
2 vehicles	28.6%
3 or more	42.4%

Heating fuel

Fuel type	%
Utility gas	83.8%
Electricity	10.3%
Propane / LP gas	5.9%

Households & families

Household type	Count	%
Married-couple family	125	43.1%
Cohabiting couple	13	4.5%
Male householder, no spouse	64	22.1%
Female householder, no spouse	88	30.3%
Households with children under 18	62	21.4%
Households with seniors (65+)	121	41.7%
Average household size	2.22

Marital status

Status	Male	Female
Never married	25.0%	24.6%
Married	51.1%	43.9%
Separated	0.8%	2.0%
Widowed	2.3%	18.6%
Divorced	20.8%	11.0%

Education

Less than 9th grade 1.2%

Some HS, no diploma 13.6%

HS graduate 44.7%

Some college, no degree 22.8%

Associate's degree 6.0%

Bachelor's degree 7.6%

Graduate / professional 4.1%

Metric	%
HS diploma or higher	85.2%
Bachelor's or higher	11.7%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	3	2.4%
Kindergarten	9	7.3%
Elementary school	54	43.5%
High school	22	17.7%
College / grad school	36	29.0%

Employment

Industry of employment

Manufacturing 20.2%

Education & healthcare 15.7%

Retail trade 13.9%

Construction 8.4%

Public administration 8.4%

Wholesale trade 6.9%

Professional & management 6.0%

Arts, food & hospitality 5.7%

Transportation & utilities 5.4%

Other services 3.9%

Agriculture & mining 3.0%

Finance & real estate 1.5%

Information 0.9%

Occupation

Category	%
Management, business & arts	25.6%
Service	15.7%
Sales & office	19.9%
Natural resources & construction	14.2%
Production & transportation	24.7%

Employment type

Type	%
Private sector	72.9%
Government	14.5%
Self-employed	12.7%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	80.5%
Carpool	9.1%
Public transit	0.0%
Walk	5.2%
Work from home	5.2%
Other means	0.0%
Avg commute (minutes)	30.2

Poverty

All people 5.1%

Under 18 years 5.0%

18 and over 5.1%

Married-couple families 0.8%

Female-led households 15.4%

Income support

Source	% of households
Social Security	44.8%
Retirement income	40.3%
Supplemental Security	5.2%
Cash public assistance	0.0%
Food stamps / SNAP	9.7%

Health indicators

Condition	%
Obesity	37.1%
High blood pressure	33.2%
High cholesterol	35.7%
Diabetes	10.0%
Heart disease	6.3%
Stroke	2.9%
Asthma	9.6%
Arthritis	28.1%
Kidney disease	2.7%
Pulmonary disease	7.1%
Cancer	6.8%

Behavior / access	%
Smoking	18.5%
Binge drinking	16.1%
No physical activity	22.8%
Less than 7 hrs sleep	32.8%
Depression	17.8%
Fair or poor health	13.3%
Poor mental health	12.8%
Poor physical health	9.9%
No health insurance	9.4%
Visited doctor (checkup)	77.2%
Visited dentist	65.3%
Cholesterol screening	90.7%
Teeth loss	12.6%

Veterans & disability

Veterans	Count	%
Civilian veterans	69	12.7%

Disability	%
Any disability	20.5%
Under 18	0.0%
18–64 years	10.7%
65 and over	56.2%

Health insurance coverage

Type	%
Private insurance	66.6%
Public insurance	41.0%
No insurance	5.9%
Uninsured under 19	6.4%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	628	97.5%
Spanish	17	2.7%
Other Indo-European	8	1.3%
Asian & Pacific Islander	8	1.3%
Other languages	1	0.2%

Place of birth & citizenship

Origin	Count	%
Native born (US)	627	97.4%
Born in same state	622	96.6%
Born in different state	482	74.8%
Foreign born	5	0.8%
Naturalized citizen	17	2.6%
Not a US citizen	1	5.9%

Ancestry

Ancestry	Count	%
Italian	102	15.8%
Arab	85	13.2%
French	76	11.8%

Ancestry	Count	%
English	54	8.4%
Dutch	4	0.6%
Polish	2	0.3%

Technology access

Metric	% of households
Computer access	45.0%
Internet access	86.9%

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

Frequently asked questions about ZIP code 61261

What city is ZIP code 61261 in?

ZIP code 61261 is primarily assigned to Lyndon, Illinois.

What county is ZIP code 61261 in?

ZIP code 61261 falls within Whiteside County, Illinois.

Does ZIP code 61261 have an older population?

25% of residents in ZIP code 61261 are 65 or older, above the national average of ~17%.

How educated is the population of ZIP code 61261?

12% of residents hold a bachelor's degree or higher — below the national average of ~33%, consistent with a trades-oriented local economy.

Does ZIP code 61261 have a large retiree population?

45% of households in ZIP code 61261 receive Social Security income, suggesting a significant retiree or disability population.

Does ZIP code 61261 have a large veteran population?

13% of civilians in ZIP code 61261 are veterans, above the national average of ~7%.

What timezone is ZIP code 61261 in?

ZIP code 61261 observes the CST timezone.