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U.S. ZIP Code 73931
5-digit United States postal code #73931, Balko, OK
ZIP code 73931 is located in the city (place name) Balko, сounty Beaver in the state of Oklahoma. The population in ZIP code 73931 is 510 and the population density is 0.8. ZIP code 73931 refers to сounty Beaver having сounty FIPS 40007, the ratio of people from different counties in this ZIP code is as follows: all county weights - 40007: 100%. In the area of the ZIP code 73931 valid time zone America/Chicago.