Seneca ZIP Codes — Nemaha County, KS

There is one unique ZIP code in Seneca, Kansas and it is 66538. Area code: 785.

ZIP codes

136.80

sq mi land

0.03

sq mi water

785

area code

Seneca, KS ZIP code map

About Seneca, KS

Seneca is a charming city located in Nemaha County, Kansas. Nestled in the heart of the Midwest, it embodies the spirit of small-town America. With a rich history and a close-knit community, Seneca is a wonderful place for both residents and visitors alike.

Location & geography

Geographically, Seneca sits at the intersection of scenic landscapes and rural charm. It is conveniently located about 29 miles northwest of Topeka and is surrounded by other small cities like Sabetha, approximately 12 miles to the east, and Holton, roughly 20 miles to the south. The city spans an area of 136.80 square miles, with just a small fraction, 0.03 square miles, designated as water.

Community & economy

The character of Seneca is defined by its friendly residents and a strong sense of community. The local economy is supported by agriculture and small businesses, contributing to a vibrant daily life. Residents enjoy community events and festivals, which showcase the culture and camaraderie present in this small city.

Transportation

Transportation in Seneca is primarily facilitated by U.S. Route 36, which connects the city to larger nearby urban areas. The nearest airport is the Billard Airport in Topeka, providing necessary air travel amenities. Public transportation options are limited, but the city's layout encourages walking and biking.

History

Seneca was founded in the mid-19th century and quickly became an important hub for agriculture in the region. Key industries have included farming, livestock, and services that support the agricultural community. The city has experienced notable events throughout its history including the celebration of local heritage during festivals.

Did you know?

A surprising fact about Seneca is that it is home to the Nemaha County Historical Society, which preserves the area's unique past. Additionally, the city offers a variety of recreational activities, including parks and trails for outdoor enthusiasts.

ZIP codes for Seneca, KS (1)

ZIP code	City	County	Map
66538	Seneca	Nemaha	View map

Demographics & statistics

3,419

Population

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

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%
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	%
High blood pressure	38.7%
High cholesterol	38.0%
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	%
Binge drinking	15.4%
No physical activity	25.0%
Less than 7 hrs sleep	31.8%
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%
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

What ZIP codes does Seneca, KS have?

Seneca, KS has one ZIP code: 66538. Each ZIP code serves a distinct delivery area within the city and surrounding region.