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U.S. ZIP Code 62551
5-digit United States postal code #62551, Niantic, IL
ZIP code 62551 is located in the city (place name) Niantic, сounty Macon in the state of Illinois. The population in ZIP code 62551 is 837 and the population density is 12.0. ZIP code 62551 refers to сounty Macon having сounty FIPS 17115, the ratio of people from different counties in this ZIP code is as follows: all county weights - 17115: 100%. In the area of the ZIP code 62551 valid time zone America/Chicago.