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Zip Code 57339 — Fort Thompson, SD

ZIP Code 57339 is associated with Fort Thompson, SD, in Buffalo County. The listed population estimate is 1,390; estimated density is 9.9 people per square mile. Among records with population estimates, it ranks #1 of 2 in Buffalo County and #106 of 372 in SD.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (44.112330, -99.478620)

Data MetricLocal Statistic
Postal / Zip Code57339
Primary CityFort Thompson
State / ProvinceSD
CountyBuffalo
Total Population1,390
Population Density9.9 people/sq mi
TimezoneAmerica/Chicago

How 57339 Compares

MetricZIP 57339Buffalo County recordsSD records
Population estimate1,3901,469 (sum)906,188 (sum)
Population Density9.9 /sq mi----
County population rank#1 of 2----
State population rank#106 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 57548Lower Brule7.5 mi1,442
ZIP 57346Stephan9.4 mi13
ZIP 57569Reliance18.1 mi497
ZIP 57341Gann Valley19.4 mi79
ZIP 57325Chamberlain20.6 mi3,335

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 →