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U.S. ZIP Code 51009
5-digit United States postal code #51009, Calumet, IA
ZIP code 51009 is located in the city (place name) Calumet, сounty O'Brien in the state of Iowa. The population in ZIP code 51009 is 164 and the population density is 268.1. ZIP code 51009 refers to сounty O'Brien having сounty FIPS 19141, the ratio of people from different counties in this ZIP code is as follows: all county weights - 19141: 100%. In the area of the ZIP code 51009 valid time zone America/Chicago.