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Zip Code 66944 — Haddam, KS

66944 is a ZIP Code associated with Haddam, KS, located within Washington. 66944 ranks #7 out of 11 ZIP codes in Washington County by population (and #533 out of 704 in KS). The area supports an estimated population of 304 residents across Data Pending housing units, with a population density of 1.3 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (39.840070, -97.293540)

Data MetricLocal Statistic
Postal / Zip Code66944
Primary CityHaddam
State / ProvinceKS
CountyWashington
Total Population304
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density1.3 people/sq mi
TimezoneAmerica/Chicago

How 66944 Compares

MetricZIP 66944Washington CountyKS State Average
Population3045,761 (Total)2,947,026 (Total)
Average ZIP IncomeData PendingN/AN/A
Population Density1.3 /sq mi----
County Pop Rank#7 of 11----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 66958Morrowville6.9 mi198N/A
Zip 66940Cuba8.9 mi283N/A
Zip 66960Narka9.2 mi125N/A
Zip 66955Mahaska9.7 mi47N/A
Zip 66968Washington12.1 mi1,454N/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 →