66521 ZIP Code — Onaga, KS

Pottawatomie County, Kansas

ZIP code 66521 is located in Onaga, Kansas, within Pottawatomie County. It covers approximately 177.63 square miles and serves a population of 1,417 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 785.

About ZIP code 66521

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 $160,400. Owner-occupancy sits near the national average at 66%.

Median household income is $55,682. 43% 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.

Educational attainment is near the national average, with 29% of residents holding a bachelor's degree or higher.

1,417

population

177.63

sq mi land

Standard

ZIP type

Central (CT)

timezone

66521 ZIP code map

Cities in ZIP code 66521

Below are the cities the US Postal Service accepts for ZIP code 66521. Using any city not on this list may result in mail delivery delays.

City	Status
Onaga	Acceptable
Onaga	Preferred

Nearby ZIP codes

66549 Westmoreland (11.4 mi) 66422 Emmett (11.4 mi) 66407 Belvue (12.8 mi) 66540 Soldier (12.9 mi) 66547 Wamego (13.6 mi) 66536 Saint Marys (17.2 mi) 66535 Saint George (18.5 mi) 66416 Circleville (19.6 mi) 66428 Goff (19.7 mi)

Demographics updated 05/2026

Population
Total population	1,417
Population density	8 / sq mi
State FIPS	20
County FIPS	149

Geography
Land area	177.63 sq mi
Water area	0.47 sq mi
Latitude	39.4423
Longitude	-96.2070
Timezone	Central (CT)
Area code	785

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%	37.4%	41.1%
$50k – $100k	31.8%	35.3%	32.2%
$100k – $200k	18.2%	23.4%	21.0%
Over $200k	4.6%	3.9%	5.7%

Demographics & statistics

1,417

Population

People per sq mi

51.9

Median age

$55,682

Median household income

$31,262

Per capita income

$160,400

Median home value

$813

Median monthly rent

66.1%

Home ownership

10.6%

Poverty rate

1.2%

Unemployment

449

Housing units

29.4%

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

115

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	296	20.9%
18 and over	1,121	79.1%
65 and over	411	29.0%
Median age	51.9 years

Race & ethnicity

White 88.4%

Two or more races 6%

Hispanic or Latino 3.1%

Asian 1.4%

American Indian / Alaska Native 1.1%

Group	Count	%
White	1,292	88.4%
Two or more races	88	6%
Hispanic or Latino	45	3.1%
Asian	21	1.4%
American Indian / Alaska Native	16	1.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	45.3%	37.4%	41.1%
$50k – $100k	31.8%	35.3%	32.2%
$100k – $200k	18.2%	23.4%	21.0%
Over $200k	4.6%	3.9%	5.7%

Under $10k 9.3%

$10k–$15k 4.4%

$15k–$25k 10.0%

$25k–$35k 6.1%

$35k–$50k 12.3%

$50k–$75k 17.8%

$75k–$100k 15.5%

$100k–$150k 13.6%

$150k–$200k 4.7%

$200k+ 6.3%

Range	% of households
Under $10k	9.3%
$10k–$15k	4.4%
$15k–$25k	10.0%
$25k–$35k	6.1%
$35k–$50k	12.3%
$50k–$75k	17.8%
$75k–$100k	15.5%
$100k–$150k	13.6%
$150k–$200k	4.7%
$200k+	6.3%
Median income	$55,682

Housing

Home values

Under $50k 14.6%

$50k–$100k 21.2%

$100k–$150k 12.0%

$150k–$200k 8.0%

$200k–$300k 26.9%

$300k–$500k 11.2%

$500k–$1M 2.9%

$1M+ 3.2%

Housing overview

Metric	Value
Median home value	$160,400
Median rent / month	$813
Owner occupied	66.1%
Renter occupied	33.9%
Vacant	15.9%
Single-family detached	78.0%
Large apartment buildings	3.3%
Mobile homes	6.5%
Median rooms	6.1
Avg household size (owned)	2.89

Year built

Era	%
2020 or later	0.8%
2010–2019	4.6%
2000–2009	4.9%
1990–1999	13.2%
1980–1989	12.4%
1970–1979	9.9%
1960–1969	4.3%
1950–1959	5.3%
1940–1949	8.4%
1939 or earlier	36.1%

Bedrooms

Size	% of units
No bedroom (studio)	3.2%
1 bedroom	12.3%
2 bedrooms	17.8%
3 bedrooms	45.9%
4 bedrooms	9.9%
5+ bedrooms	11.0%

Vehicles per household

Vehicles	% of households
No vehicle	9.8%
1 vehicle	22.7%
2 vehicles	24.8%
3 or more	42.6%

Heating fuel

Fuel type	%
Utility gas	37.7%
Electricity	21.4%
Propane / LP gas	35.8%
Wood	3.6%
No fuel used	0.6%

Households & families

Household type	Count	%
Married-couple family	300	56.8%
Cohabiting couple	19	3.6%
Male householder, no spouse	67	12.7%
Female householder, no spouse	142	26.9%
Households with children under 18	134	25.4%
Households with seniors (65+)	235	44.5%
Average household size	2.50

Marital status

Status	Male	Female
Never married	16.5%	17.3%
Married	66.5%	51.0%
Separated	1.6%	1.3%
Widowed	2.7%	18.6%
Divorced	12.6%	11.8%

Education

Less than 9th grade 2.6%

Some HS, no diploma 9.1%

HS graduate 37.5%

Some college, no degree 13.9%

Associate's degree 7.4%

Bachelor's degree 23.3%

Graduate / professional 6.1%

Metric	%
HS diploma or higher	88.3%
Bachelor's or higher	29.4%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	22	8.1%
Kindergarten	30	11.1%
Elementary school	138	51.1%
High school	63	23.3%
College / grad school	17	6.3%

Employment

Industry of employment

Education & healthcare 33.3%

Agriculture & mining 12.5%

Finance & real estate 8.3%

Public administration 8.0%

Construction 7.7%

Manufacturing 7.7%

Retail trade 6.8%

Transportation & utilities 4.5%

Wholesale trade 3.2%

Arts, food & hospitality 2.8%

Other services 2.5%

Professional & management 2.3%

Information 0.3%

Occupation

Category	%
Management, business & arts	42.0%
Service	21.3%
Sales & office	15.5%
Natural resources & construction	9.0%
Production & transportation	12.2%

Employment type

Type	%
Private sector	66.7%
Government	19.8%
Self-employed	13.5%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	68.2%
Carpool	15.7%
Public transit	0.0%
Walk	1.3%
Work from home	13.8%
Other means	1.0%
Avg commute (minutes)	24.1

Poverty

All people 10.6%

Under 18 years 8.2%

18 and over 11.3%

Married-couple families 8.0%

Female-led households 36.0%

Income support

Source	% of households
Social Security	43.2%
Retirement income	22.0%
Supplemental Security	1.9%
Cash public assistance	0.6%
Food stamps / SNAP	6.6%

Health indicators

Condition	%
Obesity	34.4%
High blood pressure	37.5%
High cholesterol	36.3%
Diabetes	11.2%
Heart disease	7.6%
Stroke	3.3%
Asthma	8.8%
Arthritis	26.9%
Kidney disease	3.2%
Pulmonary disease	6.9%
Cancer	8.3%

Behavior / access	%
Smoking	16.2%
Binge drinking	16.4%
No physical activity	22.7%
Less than 7 hrs sleep	30.4%
Depression	17.3%
Fair or poor health	13.4%
Poor mental health	12.7%
Poor physical health	9.9%
No health insurance	13.6%
Visited doctor (checkup)	74.4%
Visited dentist	68.7%
Cholesterol screening	90.3%
Teeth loss	12.6%

Veterans & disability

Veterans	Count	%
Civilian veterans	97	8.7%

Disability	%
Any disability	21.0%
Under 18	3.7%
18–64 years	13.2%
65 and over	52.5%

Health insurance coverage

Type	%
Private insurance	77.8%
Public insurance	35.7%
No insurance	4.2%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	1,352	95.4%
Spanish	18	1.3%
Other Indo-European	0	0.0%
Asian & Pacific Islander	0	0.0%
Other languages	18	1.3%

Place of birth & citizenship

Origin	Count	%
Native born (US)	1,395	98.4%
Born in same state	1,391	98.2%
Born in different state	1,075	75.9%
Foreign born	4	0.3%
Naturalized citizen	22	1.6%
Not a US citizen	1	4.5%

Ancestry

Ancestry	Count	%
Arab	175	12.4%
Italian	155	10.9%
French	111	7.8%

Ancestry	Count	%
German	34	2.4%
English	14	1%
Polish	4	0.3%

Technology access

Metric	% of households
Computer access	37.3%
Internet access	83.9%

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

Frequently asked questions about ZIP code 66521

What city is ZIP code 66521 in?

ZIP code 66521 is primarily assigned to Onaga, Kansas.

What county is ZIP code 66521 in?

ZIP code 66521 falls within Pottawatomie County, Kansas.

Does ZIP code 66521 have an older population?

29% of residents in ZIP code 66521 are 65 or older, above the national average of ~17%.

Does ZIP code 66521 have a large retiree population?

43% of households in ZIP code 66521 receive Social Security income, suggesting a significant retiree or disability population.

What is the typical home value in ZIP code 66521?

The median home value in ZIP code 66521 is $160,400.

What is the population of ZIP code 66521?

ZIP code 66521 has an estimated population of 1,417 residents, with a density of 8 people per square mile.

What timezone is ZIP code 66521 in?

ZIP code 66521 observes the CST timezone.