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Crunching costs, sorting signals, rendering insights.
Crunching costs, sorting signals, rendering insights.
Here's the thing: a 67-point spread tells the whole story in Illinois: Rockford at index 67 vs. Chicago at 134. The difference translates to roughly $1,141/month in rent alone ($1,151 vs. $2,292). Which side of that divide you land on shapes your entire budget. Full 5-city ranking below.
#1-ranked Rockford has a cost index 37 points lower than the top-5 average of 104. That's not a marginal lead — it's a category of its own.
Rent ranges from $1,151/mo in Rockford to $2,292/mo in Chicago — a monthly difference of $1,141, or $13,692 per year.
Rent in #1-ranked Rockford has increased from $1,087 to $1,151/mo over the past 12 months — a 6% increase. Rising costs may erode its top ranking over time.
Rockford (index 67) and Chicago (index 134) sit 67 points apart on the cost index — proof that Illinois is far from monolithic in affordability.
Here's the thing: a 67-point spread tells the whole story in Illinois: Rockford at index 67 vs. Chicago at 134. The difference translates to roughly $1,141/month in rent alone ($1,151 vs. $2,292). Which side of that divide you land on shapes your entire budget. Full 5-city ranking below.
Dive into Rockford's numbers: cost index 67 (44 points below national average), rent $1,151/month, income $53,328, and a home price of $172,610. The city's cost profile isn't flat — Housing is the cheapest category at 67, while Healthcare runs 93. With 146,120 residents, it balances mid-size city convenience with manageable costs.
Rockford is a clear outlier at index 67. #1-ranked Rockford has a cost index 37 points lower than the top-5 average of 104. That's not a marginal lead — it's a category of its own. About what you'd guess.
If you're ready to act on this, three things to do next: 1) Click into the city pages for the top 3 and check rent trends — direction matters more than the snapshot. 2) Run your income through the salary calculator for a personalized cost comparison. 3) Compare your top two picks head-to-head on our comparison page. The data is here; the decision is yours.
#1 Ranked: Rockford — cost index 67, rent $1,151/mo, income $53,328
Rockford is a clear outlier at index 67
3 of 5 cities come in below the national cost-of-living average of 111
Data sourced from Census Bureau, Zillow, BLS, and Tax Foundation — current as of 2026
146,120 residents · Illinois
Rockford is one of the cheaper options here. Rent is $1,151/month — for better or worse — , which is lower than most cities in this ranking. The cost index is 67. Income sits at $53,328. It's fine. Fairly typical for a city this size. Not great, not bad.
150,489 residents · Illinois
The #2 spot goes to Joliet, and the breakdown explains why. And in most cases, renters here pay $1,559/month — saving renters $4,032 per year compared to the national average. Meanwhile, Housing is the standout at index 91, keeping costs manageable. The weak spot? Healthcare at 98. At a 21% rent-to-income ratio, there's genuine breathing room in the average household budget.
113,310 residents · Illinois
Dive into Elgin's numbers: cost index 101 (10 points below national average), rent $1,736/month, income $88,316, and a home price of $323,259. The city's cost profile isn't flat — Healthcare is the cheapest category at 100, while Housing runs 101. With 113,310 residents, it balances mid-size city convenience with manageable costs (not adjusted for inflation, but still telling).
150,245 residents · Illinois
Naperville is one of the cheaper options here. And on balance, rent is $2,157/month, which is lower than most cities in this ranking. The cost index is 126. Income sits at $150,937. It lines up with what you'd expect.
2,664,452 residents · Illinois
What does daily life actually cost in Chicago? Start with the 37% rent-to-income ratio — stretched, especially for single earners. On the category level, Healthcare (index 107) is where the real savings show up, while Housing (index 134) is the line item most likely to surprise newcomers. Income at $75,134 — for better or worse — and homes at $312,457 round out a profile that ranks #5 for clear reasons.
Cities are ranked by median 1-bedroom rent in ascending order using Zillow's Observed Rent Index (ZORI). We include all tracked cities in Illinois with verified rent data, giving you a complete picture of the rental landscape from cheapest to most expensive. All data is sourced from federal agencies and verified research institutions. Cost of living indices are normalized to 100 (national median) using Zillow rent as the primary signal, with sub-category adjustments derived from regional BLS price data. Rankings are updated monthly as new data is released.
Rockford ranks #1 in Illinois for this analysis with a cost index of 67 and median income of $53,328.
Our cost of living index uses real Zillow rent data as the foundation, indexed to 100 (national median). Sub-categories (housing, food, transport, utilities, healthcare) are derived from the overall index with regional adjustments. Data is updated monthly.
Rockford (ranked #1) has a cost index of 67 and rent of $1,151/mo, while Chicago (ranked #5) has a cost index of 134 and rent of $2,292/mo — a 67-point difference in cost of living.
City data is refreshed monthly from Census Bureau population estimates, Zillow rent and home price indices, BLS salary data, and Tax Foundation tax rates. Last updated: 2026.
The median 1-bedroom rent in Rockford is $1,151/month as of 2026, based on Zillow's Observed Rent Index. This is $744 below the national median of $1,895/month.
The median home price in Rockford is $172,610, which is 3.2× the local median income. That's within the standard 3.5× affordability rule for most local earners. The national median home price is $467,370.
Illinois has a 4.95% state income tax rate. Combined state and local sales tax averages 8.83%, and the effective property tax rate is 1.73%.
This ranking was generated using data current as of early 2026. Population and income data comes from the Census Bureau's American Community Survey (5-year estimates). Rent and home price data is from Zillow's monthly releases. Tax rates are from the Tax Foundation's 2025 edition. Rankings are refreshed monthly.