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U.S. ZIP Code 51040
5-digit United States postal code #51040, Onawa, IA
ZIP code 51040 is located in the city (place name) Onawa, сounty Monona in the state of Iowa. The population in ZIP code 51040 is 3712 and the population density is 9.4. ZIP code 51040 refers to сounty Monona having сounty FIPS 19133, the ratio of people from different counties in this ZIP code is as follows: all county weights - 19133: 100%. In the area of the ZIP code 51040 valid time zone America/Chicago.