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U.S. ZIP Code 78731
5-digit United States postal code #78731, Austin, TX
ZIP code 78731 is located in the city (place name) Austin, сounty Travis in the state of Texas. The population in ZIP code 78731 is 24614 and the population density is 1097.0. ZIP code 78731 refers to сounty Travis having сounty FIPS 48453, the ratio of people from different counties in this ZIP code is as follows: all county weights - 48453: 100%. In the area of the ZIP code 78731 valid time zone America/Chicago.