Home > SD > Clark County > Willow Lake > Zip 57278

Zip Code 57278 — Willow Lake, SD

57278 is a ZIP Code associated with Willow Lake, SD, located within Clark. The postal region supports an estimated population of 1,011 residents across Data Pending housing units, with a population density of 2.5 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (44.646890, -97.682270)

Data MetricLocal Statistic
Postal / Zip Code57278
Primary CityWillow Lake
State / ProvinceSD
CountyClark
Total Population1,011
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density2.5 people/sq mi
TimezoneAmerica/Chicago

How 57278 Compares

MetricZIP 57278Clark CountySD State Average
Population1,0113,833906,188
Median IncomeData PendingN/AN/A
Population Density2.5 /sq mi----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 57271Vienna9.7 mi246N/A
Zip 57221Bryant11.8 mi1,158N/A
Zip 57322Carpenter13.7 mi378N/A
Zip 57225Clark16.5 mi1,833N/A
Zip 57233Erwin16.8 mi350N/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 →