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Zip Code 51246 — Rock Rapids, IA

51246 is a ZIP Code associated with Rock Rapids, IA, located within Lyon. 51246 ranks #1 out of 8 ZIP codes in Lyon County by population (and #161 out of 970 in IA). The area supports an estimated population of 4,041 residents across Data Pending housing units, with a population density of 9.7 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (43.427640, -96.165640)

Data MetricLocal Statistic
Postal / Zip Code51246
Primary CityRock Rapids
State / ProvinceIA
CountyLyon
Total Population4,041
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density9.7 people/sq mi
TimezoneAmerica/Chicago

How 51246 Compares

MetricZIP 51246Lyon CountyIA State Average
Population4,04112,262 (Total)3,210,984 (Total)
Average ZIP IncomeData PendingN/AN/A
Population Density9.7 /sq mi----
County Pop Rank#1 of 8----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 51242Lester8.7 mi379N/A
Zip 51230Alvord9.3 mi478N/A
Zip 51235Doon9.5 mi1,007N/A
Zip 51237George10.3 mi1,605N/A
Zip 51243Little Rock13.2 mi735N/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 →