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U.S. ZIP Code 61231
5-digit United States postal code #61231, Aledo, IL
ZIP code 61231 is located in the city (place name) Aledo, сounty Mercer in the state of Illinois. The population in ZIP code 61231 is 5627 and the population density is 14.5. ZIP code 61231 refers to сounty Mercer having сounty FIPS 17131, the ratio of people from different counties in this ZIP code is as follows: all county weights - 17131: 100%. In the area of the ZIP code 61231 valid time zone America/Chicago.