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Zip Code 57440 — Frankfort, SD

ZIP Code 57440 is associated with Frankfort, SD, in Spink County. The listed population estimate is 466; estimated density is 1.3 people per square mile. Among records with population estimates, it ranks #3 of 10 in Spink County and #218 of 372 in SD.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (44.850200, -98.259560)

Data MetricLocal Statistic
Postal / Zip Code57440
Primary CityFrankfort
State / ProvinceSD
CountySpink
Total Population466
Population Density1.3 people/sq mi
TimezoneAmerica/Chicago

How 57440 Compares

MetricZIP 57440Spink County recordsSD records
Population estimate4666,010 (sum)906,188 (sum)
Population Density1.3 /sq mi----
County population rank#3 of 10----
State population rank#218 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 57436Doland8.2 mi440
ZIP 57477Turton13.8 mi117
ZIP 57469Redfield15.5 mi2,866
ZIP 57258Raymond16.6 mi510
ZIP 57348Hitchcock16.6 mi776

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 →