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Crunching costs, sorting signals, rendering insights.
Crunching costs, sorting signals, rendering insights.
Nobody expects rock-bottom prices in Illinois — but that doesn't mean all cities are equally expensive. Rockford (index 86, rent $1,151/mo) carves out real savings within a high-cost market. We analyzed 5 cities to find where your money goes furthest in 2026.
#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.
Nobody expects rock-bottom prices in Illinois — but that doesn't mean all cities are equally expensive. Rockford (index 86, rent $1,151/mo) carves out real savings within a high-cost market. We analyzed 5 cities to find where your money goes furthest in 2026.
Look, Rockford is one of the cheaper options here. Rent is $1,151/month, which is lower than most cities in this ranking. The cost index is 86. Income sits at $53,328. It's fine. Not great, not bad. Below the radar, but not for long.
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. Take it or leave it — the data is what it is. If you're seriously considering a move, use our salary calculator to model your specific income against these numbers (not adjusted for inflation, but still telling).
#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
At $1,151/month for rent and a cost index of 86, Rockford is pretty much what you'd expect from a mid-size city in this part of the country. Income is $53,328. That alone makes it worth considering (not adjusted for inflation, but still telling).
150,489 residents · Illinois
The #2 spot goes to Joliet, and the breakdown explains why. Renters here pay $1,559/month — saving renters $4,032 per year compared to the national average. Meanwhile, Utilities is the standout at index 89, making it one of the cheapest in the country for that category. The weak spot? Healthcare at 100. At a 21% rent-to-income ratio, there's genuine breathing room in the average household budget.
113,310 residents · Illinois
Here's Elgin by the numbers — and there's a lot to like (and a little to watch). Cost index: 103. Rent: $1,736/month. Income: $88,316/year. It lines up with what you'd expect. 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. Run the numbers annually, and it's like getting a bonus you didn't negotiate.
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. From a pure purchasing-power standpoint, this is elite (and that gap widens if you factor in state taxes).
150,245 residents · Illinois
Why Naperville ranks #5: the numbers tell a clear story. At 122 on the cost index, residents spend roughly 10% more than the typical American. Rent sits at $2,157/month while the median household pulls in $150,937/year. The Utilities category is particularly strong at 112, though Housing (154) lags behind. Home prices average $594,498 — $127,128 above the national median.
Cities are ranked by their healthcare 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 healthcare index at 89, 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.