Below are a list of the cities located in Marion County, IL. There are 11 total unique zip codes in Marion County, Illinois. The time zone for Marion 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 17121.
The population in Marion County, IL is currently 37,390. That is a decrease of -5.13% vs the population of 39,437 in 2010.
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