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Crunching costs, sorting signals, rendering insights.
Crunching costs, sorting signals, rendering insights.
Let's be honest: Illinois isn't cheap. But within that premium market, there are cities where your dollar stretches meaningfully further. Rockford proves it with a cost index of 86, the lowest in Illinois, and we've ranked all 5 contenders to help you find the best deal in an expensive landscape.
#1-ranked Rockford has a cost index 18 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 $2,157/mo in Naperville — a monthly difference of $1,006, or $12,072 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.
Let's be honest: Illinois isn't cheap. But within that premium market, there are cities where your dollar stretches meaningfully further. Rockford proves it with a cost index of 86, the lowest in Illinois, and we've ranked all 5 contenders to help you find the best deal in an expensive landscape.
The housing sub-index is derived from overall cost of living with regional BLS price adjustments. A score of 109 (the top-10 average here) means housing costs are about -9% below the national median. Rockford leads at 66, followed by Joliet (92) and Elgin (106). Note: a low housing index doesn't guarantee a low overall cost — check the full cost breakdown table below.
Here's Rockford by the numbers — and there's a lot to like (and a little to watch). Cost index: 86. Rent: $1,151/month. Income: $53,328/year. Home price: $172,610. Population: 146,120. The strongest category is Housing at 66; the most expensive is Healthcare at 89. Translate that rent to annual numbers, and residents are saving renters $8,928 per year vs. the national median. If two cities have the same income, this cost gap is the tiebreaker.
Bottom line: Rockford leads this ranking for clear, data-backed reasons — but the "best" city depends on your priorities. Click into any city below to see the full detail page with 12-month trend charts, profession-specific salary data, and a breakdown of all five cost categories. If you're seriously considering a move, use our salary calculator to model your specific income against these numbers. No gimmicks — just good numbers.
#1 Ranked: Rockford — cost index 86, rent $1,151/mo, income $53,328
Rockford is a clear outlier at index 86
4 of 5 cities come in below the national cost-of-living average of 112
Data sourced from Census Bureau, Zillow, BLS, and Tax Foundation — current as of 2026
146,120 residents · Illinois
Why Rockford ranks #1: the numbers tell a clear story. At 86 on the cost index, residents save roughly 26% less than the typical American. Rent sits at $1,151/month while the median household pulls in $53,328/year. The Housing category is particularly strong at 66, though Healthcare (89) lags behind. Home prices average $172,610 — $294,760 below the national median.
150,489 residents · Illinois
The numbers for Joliet are straightforward: 97 on the cost index, $1,559/month rent, $88,026 income. And on balance, not the most exciting entry in the list, but solid. Nothing too surprising there.
113,310 residents · Illinois
Elgin earns its position at #3 through a combination that's hard to replicate. And more often than not, the 103 cost index sits 9 points below the national baseline, and the $88,316 median income means purchasing power here is genuinely above average. Homes list at $323,259 — $144,111 below the national median — a genuine ownership opportunity. On the cost side, Utilities leads the way at 94, while Healthcare trails at 106.
2,664,452 residents · Illinois
Here's Chicago by the numbers — and there's a lot to like (and a little to watch). Cost index: 111. Rent: $2,292/month. Income: $75,134/year. Home price: $312,457. Population: 2,664,452. The strongest category is Utilities at 102; the most expensive is Housing at 127. Translate that rent to annual numbers, and residents are costing renters $4,764 more per year vs. the national median. That's a strong position by any measure (and that gap widens if you factor in state taxes).
150,245 residents · Illinois
Dive into Naperville's numbers: cost index 122 — we had to double-check this one — (10 points above national average), rent $2,157/month, income $150,937, and a home price of $594,498. The city's cost profile isn't flat — Utilities is the cheapest category at 112, while Housing runs 154. With 150,245 residents, it balances mid-size city convenience with manageable costs (not adjusted for inflation, but still telling).
Cities are ranked by their housing cost sub-index within Illinois. Each sub-index is derived from the overall cost of living with regional adjustment factors. 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 86 and median income of $53,328.
Rockford, IL has the lowest housing index at 66, compared to the national average of 100.
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 86 and rent of $1,151/mo, while Naperville (ranked #5) has a cost index of 122 and rent of $2,157/mo — a 36-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.