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Zip Code 57042 — Madison, SD

ZIP Code 57042 is associated with Madison, SD, in Lake County. The listed population estimate is 7,756; estimated density is 15.5 people per square mile. Among records with population estimates, it ranks #1 of 7 in Lake County and #28 of 372 in SD.
Page generated: 2026-10-08. This is not the source data release date.

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Data MetricLocal Statistic
Postal / Zip Code57042
Primary CityMadison
State / ProvinceSD
CountyLake
Total Population7,756
Population Density15.5 people/sq mi
TimezoneAmerica/Chicago

How 57042 Compares

MetricZIP 57042Lake County recordsSD records
Population estimate7,75611,128 (sum)906,188 (sum)
Population Density15.5 /sq mi----
County population rank#1 of 7----
State population rank#28 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 57075Wentworth9.2 mi1,296
ZIP 57076Winfred10.0 mi325
ZIP 57016Chester11.3 mi676
ZIP 57054Ramona11.3 mi703
ZIP 57057Rutland13.0 mi196

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 →