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U.S. ZIP Code 52231
5-digit United States postal code #52231, Harper, IA
ZIP code 52231 is located in the city (place name) Harper, сounty Keokuk in the state of Iowa. The population in ZIP code 52231 is 328 and the population density is 3.9. ZIP code 52231 refers to сounty Keokuk having сounty FIPS 19107, the ratio of people from different counties in this ZIP code is as follows: all county weights - 19107: 100%. In the area of the ZIP code 52231 valid time zone America/Chicago.