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Zip Code 57278 — Willow Lake, SD

ZIP Code 57278 is associated with Willow Lake, SD, in Clark County. The listed population estimate is 1,011; estimated density is 2.5 people per square mile. Among records with population estimates, it ranks #2 of 6 in Clark County and #139 of 372 in SD.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (44.646890, -97.682270)

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

How 57278 Compares

MetricZIP 57278Clark County recordsSD records
Population estimate1,0113,833 (sum)906,188 (sum)
Population Density2.5 /sq mi----
County population rank#2 of 6----
State population rank#139 of 372----

Regional sums combine the population estimates in the listed ZIP records; they are not official county or state population totals.

Explore More ZIP Codes

Nearby ZIP Codes in SD

ZIP CodeCityDistancePopulation estimate
ZIP 57271Vienna9.7 mi246
ZIP 57221Bryant11.8 mi1,158
ZIP 57322Carpenter13.7 mi378
ZIP 57225Clark16.5 mi1,833
ZIP 57233Erwin16.8 mi350

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 →