According to 2010 census data released, Rockford is holding onto the spot as Illinois' third largest city. Unless a population boom is in our future, there are several cities poised to pass us. Some are thinking Elgin will be the next to pass us, but it may take them 10 years to do so. Their population is just over 108,000
Rockford's population increased just 1.8 percent over the past 10 years to 152,871. Joliet grew by 38.8 percent to 147,433 and Naperville increased 10.5 percent to 141,853. Winnebago County's official population was 295,266, and it was passed by McHenry County for the sixth most populous county.
Winnebgo county as a whole grew 7.6% to 299,702. for more info visit www.census.gov