City rankings

Largest Cities in Illinois

Chicago ranks #1 in Illinois for largest cities at 2,711,226.

This ranking orders all 50 qualifying Illinois cities by population, computed directly from the U.S. Census Bureau's American Community Survey and CDC PLACES datasets, never a blended or proprietary score. It is one of 9 single-metric rankings Areazine publishes for Illinois, each answering one direct question from official federal data. Compare Chicago's standing against every other Illinois city ranked below.

50
Cities ranked
2,711,226
#1 Chicago
36,375
Lowest, Oswego

What this Illinois ranking shows

According to the U.S. Census Bureau's American Community Survey (ACS) 5-year estimates, the CDC PLACES population-level health analysis, and the CMS Hospital Compare quality data, Areazine ranks U.S. cities across more than 19,000 incorporated places, census-designated places, and consolidated city-county governments. State-level city rankings combine these federal datasets to produce intra-state comparisons across demographics, economics, health outcomes, and hospital quality.

Chicago leads 50 Illinois cities at 2,711,226, while Oswego sits at the bottom with 36,375 - a total spread of 2,674,851 on population. The top 5 occupy 96% of that range, indicating a wide separation between leaders and the rest of the field.

The median Illinois city in this list sits at 53,569, 2,657,657 behind Chicago. See our methodology for ranking construction, data vintage, refresh cadence, and the federal upstream tables we join, and triangulate via the 8 other Illinois rankings below, cities that lead on multiple lenses are the most robust signals.

Top 5 - Largest Cities

Top 5 Illinois cities ranked by population
Rank City population Population
#1 Chicago 2,711,226 2.7M
#2 Aurora 179,898 201K
#3 Naperville 150,692 147K
#4 Joliet 150,445 148K
#5 Rockford 147,521 148K

Does population track with city size?

Largest Cities vs. population, top 25 ranked cities

Source: U.S. Census Bureau (population), population per methodology 2×2 strategic matrix plotting 25 entities by Population (X) and population (Y), with a crosshair dividing the plot into four quadrants. Large & strongSmall & strongLarge & weakSmall & weak -1,000,00001,000,0002,000,0003,000,000 -1,000,00001,000,0002,000,0003,000,000 Population population Largest Cities vs. population, top 25 ranked cities
Source: U.S. Census Bureau (population), population per methodology

Largest Cities 50

More Illinois Rankings 8

Reading this Illinois ranking responsibly

Single-metric rankings are useful precisely because they are honest about what they measure. A "highest income" ranking does not tell you that the top-ranked city is the best place to live in Illinois; it tells you that, among cities of population ten thousand and above in Illinois that have a published median household income field in the most recent American Community Survey five-year estimates, this city has the highest such value. That precise definition matters, because composite "best places" lists from real-estate marketing sites and lifestyle magazines often combine income with subjective weights on schools, walkability, and amenities, producing a score whose components are not disclosed and whose ordering is not reproducible. Areazine's editorial commitment is to keep the underlying field, source, and vintage visible so the reader can audit any rank in this list against the canonical federal record.

Cross-checking against other rankings is a useful sanity test. A city that appears in the top ten on three or more different rankings, for example, highest income, most educated, and lowest poverty, is showing a robust signal across multiple independent dimensions. A city that appears in the top ten on only one ranking and middling on the others is showing a narrower signal, often driven by a single statistical artifact (a small population pulling the per-capita measure, a recent acquisition spike inflating median home value, an outlier survey year). The other nine Illinois rankings linked above provide that cross-check at zero extra effort.

Data Sources

Population and economic data from the Census Bureau American Community Survey (2024 5-year estimates). Health data from the CDC PLACES (2023). Ranking computations use U.S. Census Bureau reference geographies. Crime statistics, where referenced, originate from the FBI Uniform Crime Reporting program (also accessible via the Crime Data Explorer).