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Zip Code 51031 — Le Mars, IA

ZIP Code 51031 is associated with Le Mars, IA, in Plymouth County. The listed population estimate is 12,808; estimated density is 21.1 people per square mile. Among records with population estimates, it ranks #1 of 11 in Plymouth County and #64 of 969 in IA.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (42.802820, -96.180920)

Data MetricLocal Statistic
Postal / Zip Code51031
Primary CityLe Mars
State / ProvinceIA
CountyPlymouth
Total Population12,808
Population Density21.1 people/sq mi
TimezoneAmerica/Chicago

How 51031 Compares

MetricZIP 51031Plymouth County recordsIA records
Population estimate12,80834,178 (sum)3,210,984 (sum)
Population Density21.1 /sq mi----
County population rank#1 of 11----
State population rank#64 of 969----

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 IA

ZIP CodeCityDistancePopulation estimate
ZIP 51008Brunsville4.4 mi210
ZIP 51045Oyens6.4 mi66
ZIP 51038Merrill9.6 mi1,449
ZIP 51036Maurice11.6 mi445
ZIP 51050Remsen11.8 mi2,962

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 →