Loading
Assembling your view…
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. And generally speaking, 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. And generally speaking, rockford at index 86 is the standout — offering meaningful savings without leaving Illinois.
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. For anyone relocating from a high-cost market, this will feel like a raise.
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 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
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.
150,489 residents · Illinois
A closer look at Joliet: the cost index of 97 breaks down to a Utilities index of 89 (strongest category) and a Healthcare index of 100 (weakest). Median rent is $1,559/month — 18% below the national median — while household income sits at $88,026, meaning locals spend about 21% of income on rent. That's a healthy margin by any standard.
113,310 residents · Illinois
The numbers for Elgin are straightforward: 103 on the cost index, $1,736/month rent, $88,316 income. Not the most exciting entry in the list, but solid. That tracks.
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.
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 utilities 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 utilities index at 79, 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.