Below are a list of the cities located in Grundy County, IL. There are 9 total unique zip codes in Grundy County, Illinois. The time zone for Grundy County is the Central Daylight Time zone and they follow daylight savings time. The Federal Information Processing System (FIPS) Code for echo $county.' County, '.$state_abbrev ?> is 17063.
The population in Grundy County, IL is currently 52,989. That is an increase of 4.00% vs the population of 50,063 in 2010.
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