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U.S. ZIP Code 51031
5-digit United States postal code #51031, Le Mars, IA
ZIP code 51031 is located in the city (place name) Le Mars, сounty Plymouth in the state of Iowa. The population in ZIP code 51031 is 12336 and the population density is 20.4. ZIP code 51031 refers to сounty Plymouth having сounty FIPS 19149, the ratio of people from different counties in this ZIP code is as follows: all county weights - 19149: 100%. In the area of the ZIP code 51031 valid time zone America/Chicago.