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U.S. ZIP Code 51446
5-digit United States postal code #51446, Irwin, IA
ZIP code 51446 is located in the city (place name) Irwin, сounty Shelby in the state of Iowa. The population in ZIP code 51446 is 511 and the population density is 5.7. ZIP code 51446 refers to сounty Shelby having сounty FIPS 19165, the ratio of people from different counties in this ZIP code is as follows: all county weights - 19165: 100%. In the area of the ZIP code 51446 valid time zone America/Chicago.