Home > KS > Pottawatomie County > Onaga > Zip 66521

Zip Code 66521 — Onaga, KS

66521 is a ZIP Code associated with Onaga, KS, located within Pottawatomie. 66521 ranks #5 out of 9 ZIP codes in Pottawatomie County by population (and #286 out of 704 in KS). The area supports an estimated population of 1,417 residents across Data Pending housing units, with a population density of 3.1 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (39.476680, -96.221280)

Data MetricLocal Statistic
Postal / Zip Code66521
Primary CityOnaga
State / ProvinceKS
CountyPottawatomie
Total Population1,417
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density3.1 people/sq mi
TimezoneAmerica/Chicago

How 66521 Compares

MetricZIP 66521Pottawatomie CountyKS State Average
Population1,41721,983 (Total)2,947,026 (Total)
Average ZIP IncomeData PendingN/AN/A
Population Density3.1 /sq mi----
County Pop Rank#5 of 9----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 66432Havensville7.9 mi540N/A
Zip 66549Westmoreland11.6 mi1,526N/A
Zip 66422Emmett12.3 mi1,228N/A
Zip 66540Soldier13.2 mi582N/A
Zip 66544Vermillion14.9 mi287N/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 →