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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.
A closer look at Rockford: the cost index of 86 breaks down to a Housing index of 66 (strongest category) and a Healthcare index of 89 (weakest). And from what we can tell, median rent is $1,151/month — 39% below the national median — while household income sits at $53,328, meaning locals spend about 26% of income on rent. That's within the recommended 30% threshold, though it doesn't leave much room.
The counter-argument is worth hearing: Here's the state-level backdrop: Illinois averages a 104 cost index, $1,779/mo — for better or worse — rent, and $91,148 income across 5 cities. And in most cases, that's $116 less than the national rent average. Chicago's premium versus downstate bargains — and that context shapes every city in this ranking (not adjusted for inflation, but still telling).
The way we see it, 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 (which, to be fair, is a metric that favors smaller cities). The math checks out.
#1 Ranked: Rockford — cost index 86, rent $1,151/mo, income $53,328
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
What does daily life actually cost in Rockford? Start with the 26% rent-to-income ratio — tight but manageable for most households. On the category level, Housing (index 66) is where the real savings show up, while Healthcare (index 89) is the line item most likely to surprise newcomers. Income at $53,328 — which, honestly, is lower than you'd expect here — and homes at $172,610 round out a profile that ranks #1 for clear reasons (not adjusted for inflation, but still telling).
150,489 residents · Illinois
Here's Joliet by the numbers — and there's a lot to like (and a little to watch). Cost index: 97. Rent: $1,559/month — for better or worse — . Income: $88,026/year. Home price: $255,981. Population: 150,489. The strongest category is Utilities at 89; the most expensive is Healthcare at 100. Translate that rent to annual numbers, and residents are saving renters $4,032 per year vs. the national median. Over thirty years of homeownership, the property tax savings alone are staggering.
113,310 residents · Illinois
Here's Elgin by the numbers — and there's a lot to like (and a little to watch). And in practical terms, cost index: 103. Rent: $1,736/month — which, honestly, is lower than you'd expect here — . Income: $88,316/year. Home price: $323,259. Population: 113,310. The strongest category is Utilities at 94; the most expensive is Healthcare at 106. Translate that rent to annual numbers, and residents are saving renters $1,908 per year vs. the national median. For anyone relocating from a high-cost market, this will feel like a raise.
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, Utilities (index 102) is where the real savings show up, while Housing (index 127) is the line item most likely to surprise newcomers. Income at $75,134 and homes at $312,457 round out a profile that ranks #4 for clear reasons.
150,245 residents · Illinois
The #5 spot goes to Naperville, and the breakdown explains why. And on balance, renters here pay $2,157/month — which, honestly, is lower than you'd expect here — — costing renters $3,144 more per year compared to the national average. Meanwhile, Utilities is the standout at index 112, keeping costs manageable. The weak spot? Housing at 154. At a 17% rent-to-income ratio, there's genuine breathing room in the average household budget.
Cities are ranked by their transportation 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 transportation index at 82, 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.