ZIP Code 66538
About Seneca
Seneca is a city in and the county seat of Nemaha County, Kansas, United States. As of the 2020 census, the population of the city was 2,139.
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Area Profile
US Census (ACS 5-year · Gazetteer)
3,577
population
$77,076
median household income
26
people / sq mi
$252,900
median home value
$696
median gross rent
41.0
median age
1,506
housing units
1,371
households
136.8
land area (sq mi)