66538 ZIP Code — Seneca, KS

Nemaha County, Kansas

ZIP code 66538 is located in Seneca, Kansas, within Nemaha County. It covers approximately 136.80 square miles and serves a population of 3,419 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 785.

About ZIP code 66538

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 $234,000. Owner-occupancy is high at 80%, well above the national average.

Median household income is $73,434. The poverty rate of 7% is below the national average. 32% 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 11 minutes is near the national average.

Educational attainment is near the national average, with 28% of residents holding a bachelor's degree or higher.

Overall, ZIP code 66538 reflects a community defined by high homeownership and a significant Social Security-dependent population.

3,419

population

136.80

sq mi land

Standard

ZIP type

Central (CT)

timezone

66538 ZIP code map

Cities in ZIP code 66538

Below are the cities the US Postal Service accepts for ZIP code 66538. Using any city not on this list may result in mail delivery delays.

City	Status
Seneca	Acceptable
Seneca	Preferred

Nearby ZIP codes

66408 Bern (6.7 mi) 66404 Baileyville (9.1 mi) 66534 Sabetha (10.5 mi) 68345 Du Bois (12.3 mi) 66415 Centralia (12.7 mi) 66403 Axtell (14.5 mi) 66428 Goff (15.3 mi) 68420 Pawnee City (16.1 mi) 66425 Fairview (16.2 mi) 66515 Morrill (17 mi) 66550 Wetmore (17.5 mi) 68376 Humboldt (19 mi)

Demographics updated 05/2026

Population
Total population	3,419
Population density	25 / sq mi
State FIPS	20
County FIPS	131

Geography
Land area	136.80 sq mi
Water area	0.03 sq mi
Latitude	39.8702
Longitude	-96.0140
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	45.2%	42.4%	41.1%
$50k – $100k	28.5%	32.1%	32.2%
$100k – $200k	22.1%	22.1%	21.0%
Over $200k	4.2%	3.4%	5.7%

Demographics & statistics

3,419

Population

People per sq mi

41.5

Median age

$73,434

Median household income

$35,420

Per capita income

$234,000

Median home value

$750

Median monthly rent

79.9%

Home ownership

7.0%

Poverty rate

1.9%

Unemployment

1,184

Housing units

28.0%

Bachelor's or higher

Age distribution

Male Female

104

Under 5

157

5–9

134

155

10–14

134

125

15–19

107

20–24

186

25–34

160

230

35–44

197

161

45–54

139

127

55–59

110

177

60–64

152

173

65–74

149

107

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	936	27.4%
18 and over	2,483	72.6%
65 and over	658	19.2%
Median age	41.5 years

Race & ethnicity

White 96.3%

Hispanic or Latino 1.2%

Two or more races 1%

Other race 0.9%

Black or African American 0.4%

American Indian / Alaska Native 0.2%

Group	Count	%
White	3,333	96.3%
Hispanic or Latino	41	1.2%
Two or more races	36	1%
Other race	30	0.9%
Black or African American	14	0.4%
American Indian / Alaska Native	6	0.2%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	45.2%	42.4%	41.1%
$50k – $100k	28.5%	32.1%	32.2%
$100k – $200k	22.1%	22.1%	21.0%
Over $200k	4.2%	3.4%	5.7%

Under $10k 2.7%

$10k–$15k 2.8%

$15k–$25k 5.2%

$25k–$35k 5.6%

$35k–$50k 15.7%

$50k–$75k 23.0%

$75k–$100k 9.3%

$100k–$150k 17.3%

$150k–$200k 11.0%

$200k+ 7.5%

Range	% of households
Under $10k	2.7%
$10k–$15k	2.8%
$15k–$25k	5.2%
$25k–$35k	5.6%
$35k–$50k	15.7%
$50k–$75k	23.0%
$75k–$100k	9.3%
$100k–$150k	17.3%
$150k–$200k	11.0%
$200k+	7.5%
Median income	$73,434

Housing

Home values

Under $50k 9.3%

$50k–$100k 7.5%

$100k–$150k 9.7%

$150k–$200k 15.1%

$200k–$300k 26.1%

$300k–$500k 24.6%

$500k–$1M 6.8%

$1M+ 0.9%

Housing overview

Metric	Value
Median home value	$234,000
Median rent / month	$750
Owner occupied	79.9%
Renter occupied	20.1%
Vacant	9.0%
Single-family detached	87.9%
Large apartment buildings	0.3%
Mobile homes	2.3%
Median rooms	6.7
Avg household size (owned)	2.54

Year built

Era	%
2020 or later	0.0%
2010–2019	9.5%
2000–2009	7.8%
1990–1999	10.1%
1980–1989	14.2%
1970–1979	16.4%
1960–1969	9.2%
1950–1959	4.6%
1940–1949	4.8%
1939 or earlier	23.3%

Bedrooms

Size	% of units
No bedroom (studio)	1.4%
1 bedroom	4.3%
2 bedrooms	24.4%
3 bedrooms	27.7%
4 bedrooms	30.4%
5+ bedrooms	11.7%

Vehicles per household

Vehicles	% of households
No vehicle	1.6%
1 vehicle	22.2%
2 vehicles	35.3%
3 or more	40.9%

Heating fuel

Fuel type	%
Utility gas	53.1%
Electricity	18.9%
Propane / LP gas	22.2%
Fuel oil	1.2%
Wood	3.3%
No fuel used	0.7%

Households & families

Household type	Count	%
Married-couple family	836	63.4%
Cohabiting couple	60	4.5%
Male householder, no spouse	222	16.8%
Female householder, no spouse	201	15.2%
Households with children under 18	373	28.3%
Households with seniors (65+)	410	31.1%
Average household size	2.48

Marital status

Status	Male	Female
Never married	27.8%	16.9%
Married	57.4%	65.8%
Separated	2.2%	0.0%
Widowed	2.9%	13.3%
Divorced	9.8%	3.9%

Education

Less than 9th grade 3.2%

Some HS, no diploma 3.8%

HS graduate 39.4%

Some college, no degree 15.3%

Associate's degree 10.2%

Bachelor's degree 17.1%

Graduate / professional 10.9%

Metric	%
HS diploma or higher	92.9%
Bachelor's or higher	28.0%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	82	9.0%
Kindergarten	21	2.3%
Elementary school	490	53.9%
High school	214	23.5%
College / grad school	102	11.2%

Employment

Industry of employment

Education & healthcare 26.5%

Manufacturing 14.4%

Retail trade 12.7%

Agriculture & mining 11.5%

Transportation & utilities 6.9%

Other services 5.3%

Construction 4.8%

Finance & real estate 4.8%

Professional & management 4.1%

Arts, food & hospitality 3.8%

Public administration 3.8%

Wholesale trade 1.1%

Information 0.2%

Occupation

Category	%
Management, business & arts	41.0%
Service	9.9%
Sales & office	21.5%
Natural resources & construction	6.2%
Production & transportation	21.5%

Employment type

Type	%
Private sector	76.1%
Government	12.4%
Self-employed	10.8%
Unpaid family workers	0.7%

Commute

Method	%
Drive alone	80.4%
Carpool	8.5%
Public transit	0.7%
Walk	4.4%
Work from home	5.9%
Other means	0.2%
Avg commute (minutes)	11.4

Poverty

All people 7.0%

Under 18 years 8.1%

18 and over 6.5%

Married-couple families 1.3%

Female-led households 62.5%

Income support

Source	% of households
Social Security	32.1%
Retirement income	20.5%
Supplemental Security	3.6%
Cash public assistance	1.1%
Food stamps / SNAP	1.4%

Health indicators

Condition	%
Obesity	35.8%
High blood pressure	38.7%
High cholesterol	38.0%
Diabetes	11.8%
Heart disease	8.6%
Stroke	3.8%
Asthma	8.9%
Arthritis	29.3%
Kidney disease	3.6%
Pulmonary disease	7.9%
Cancer	8.9%

Behavior / access	%
Smoking	17.4%
Binge drinking	15.4%
No physical activity	25.0%
Less than 7 hrs sleep	31.8%
Depression	17.6%
Fair or poor health	15.2%
Poor mental health	12.5%
Poor physical health	10.9%
No health insurance	13.5%
Visited doctor (checkup)	75.5%
Visited dentist	66.4%
Cholesterol screening	90.5%
Teeth loss	14.9%

Veterans & disability

Veterans	Count	%
Civilian veterans	158	6.4%

Disability	%
Any disability	12.9%
Under 18	1.1%
18–64 years	7.6%
65 and over	49.3%

Health insurance coverage

Type	%
Private insurance	78.9%
Public insurance	26.0%
No insurance	5.5%
Uninsured under 19	5.5%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	3,226	94.4%
Spanish	16	0.5%
Other Indo-European	9	0.3%
Asian & Pacific Islander	7	0.2%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	3,360	98.3%
Born in same state	3,348	97.9%
Born in different state	2,690	78.7%
Foreign born	12	0.4%
Naturalized citizen	59	1.7%
Not a US citizen	28	47.5%

Ancestry

Ancestry	Count	%
French	201	5.9%
Italian	199	5.8%
Arab	176	5.1%

Ancestry	Count	%
Dutch	33	1%
German	10	0.3%
Polish	9	0.3%

Technology access

Metric	% of households
Computer access	38.6%
Internet access	89.8%

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

Frequently asked questions about ZIP code 66538

What city is ZIP code 66538 in?

ZIP code 66538 is primarily assigned to Seneca, Kansas.

What county is ZIP code 66538 in?

ZIP code 66538 falls within Nemaha County, Kansas.

What is the population of ZIP code 66538?

ZIP code 66538 has an estimated population of 3,419 residents, with a density of 25 people per square mile.

What is the typical home value in ZIP code 66538?

The median home value in ZIP code 66538 is $234,000.

What is the median household income in ZIP code 66538?

The median household income in ZIP code 66538 is $73,434, below the national median of ~$75,000.

What timezone is ZIP code 66538 in?

ZIP code 66538 observes the CST timezone.