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Crunching costs, sorting signals, rendering insights.
Crunching costs, sorting signals, rendering insights.
Premium market, smart picks: while Illinois trends above the national average, the gap between the most and least expensive cities here is wider than you'd think. Rockford at index 86 is the standout — offering meaningful savings without leaving Illinois.
Premium market, smart picks: while Illinois trends above the national average, the gap between the most and least expensive cities here is wider than you'd think. Rockford at index 86 is the standout — offering meaningful savings without leaving Illinois.
The #1 spot goes to Rockford, and the breakdown explains why. Renters here pay $1,151/month — saving renters $8,928 per year compared to the national average. Meanwhile, Housing is the standout at index 66, making it one of the cheapest in the country for that category. The weak spot? Healthcare at 89. A 26% rent-to-income ratio keeps most households inside the safe zone.
The same data, viewed through a different lens: State context matters: Illinois's 5 cities average a 104 cost index with $1,779/month median rent and $91,148 household income. Chicago's premium versus downstate bargains. That tracks. Look at what happens when you add healthcare costs.
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.
#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
Rockford earns its position at #1 through a combination that's hard to replicate. The 86 cost index sits 26 points below the national baseline, and the $53,328 — we had to double-check this one — median income means purchasing power here is amplified by the low cost base. Homes list at $172,610 — $294,760 below the national median — a genuine ownership opportunity. On the cost side, Housing leads the way at 66, while Healthcare trails at 89 (and that gap widens if you factor in state taxes).
150,489 residents · Illinois
Why Joliet ranks #2: the numbers tell a clear story. At 97 on the cost index, residents save roughly 15% less than the typical American. Rent sits at $1,559/month while the median household pulls in $88,026/year. The Utilities category is particularly strong at 89, though Healthcare (100) lags behind. Home prices average $255,981 — $211,389 below the national median.
113,310 residents · Illinois
Elgin earns its position at #3 through a combination that's hard to replicate. 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
Chicago earns its position at #4 through a combination that's hard to replicate. The 111 cost index sits 1 points below the national baseline, and the $75,134 median income means purchasing power here is amplified by the low cost base. Homes list at $312,457 — $154,913 below the national median — a genuine ownership opportunity. On the cost side, Utilities leads the way at 102, while Housing trails at 127.
150,245 residents · Illinois
Dive into Naperville's numbers: cost index 122 (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.
Cities are ranked by their food & groceries 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 food & groceries index at 85, 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.