Methodology · what counts as a city
Illinois records follow the legacy Census PEP city/place cohort.
Illinois cities follow the same V1 universe: incorporated places, consolidated city-county governments where applicable, and Washington DC where applicable. Census-designated places (CDPs) are excluded, with one named national exception — Urban Honolulu (Honolulu only). State ranks are standard competition ranking (“1224”) within Illinois: tied cities share the lower rank and the next rank is skipped. Ranks are pre-computed in the dataset (state_rank_pop_current).
City rankings cover our incorporated-place and consolidated-government population dataset, with Washington, D.C. and Urban Honolulu as named special cases. They do not count every community. Census also publishes annual estimates for eligible towns and townships, which this city dataset does not include.Use the community lookup on this page to find Census places and county subdivisions separately. Its survey estimates describe 2020–2024 and are not part of these city rankings.
Census publishes annual town and township estimates in 20 states. Twelve are strong-MCD states. Those native minor civil divisions are excluded from this legacy cohort, even where an annual estimate exists. Separate community population records do not inherit this list's ranks or other metrics.