Rockford is its third-largest city
4, Joliet  wikipedia article, 147,433, 41.525 / -... [DOC] [TLE] Rockford One Of Fastest Shrinking Cities In America | USofArn.com [PAR] May 21, 2015 ... Rockford is known as the Forest City, that nickname may have to be changed to 
the Shrinking City as Illinois' 3rd largest city was one of the top ten cities in ... 
largest city as its population cracked the one million mark in 2014.