Home > KS > Nemaha County > Seneca > Zip 66538

Zip Code 66538 — Seneca, KS

66538 is a ZIP Code associated with Seneca, KS, located within Nemaha. 66538 ranks #1 out of 9 ZIP codes in Nemaha County by population (and #159 out of 704 in KS). The area supports an estimated population of 3,602 residents across Data Pending housing units, with a population density of 10.2 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (39.849420, -96.045910)

Data MetricLocal Statistic
Postal / Zip Code66538
Primary CitySeneca
State / ProvinceKS
CountyNemaha
Total Population3,602
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density10.2 people/sq mi
TimezoneAmerica/Chicago

How 66538 Compares

MetricZIP 66538Nemaha CountyKS State Average
Population3,60210,088 (Total)2,947,026 (Total)
Average ZIP IncomeData PendingN/AN/A
Population Density10.2 /sq mi----
County Pop Rank#1 of 9----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 66522Oneida5.8 mi130N/A
Zip 66404Baileyville7.1 mi481N/A
Zip 66408Bern8.1 mi427N/A
Zip 66534Sabetha11.3 mi3,381N/A
Zip 66415Centralia12.1 mi762N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →