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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. Naperville at index 122 is the standout — offering meaningful savings without leaving Illinois.
#1 Ranked: Naperville — cost index 122, rent $2,157/mo, income $150,937
Naperville is a clear outlier at index 122
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
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. Naperville at index 122 is the standout — offering meaningful savings without leaving Illinois.
Naperville is a clear outlier at index 122. #1-ranked Naperville has a cost index 18 points higher than the top-5 average of 104. That's not a marginal lead — it's a category of its own.
The #1 spot goes to Naperville, and the breakdown explains why. Renters here pay $2,157/month — 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.
The ranking uses a composite of 2026 data from Census Bureau population/income surveys, Zillow rent and home price indices, BLS salary benchmarks, and Tax Foundation tax rates. Naperville (index 122, rent $2,157); Elgin (index 103, rent $1,736); Joliet (index 97, rent $1,559). Each city profile below links to the full detail page with 12-month trends, salary breakdowns, and cost category comparisons.
Before celebrating, check the next metric: 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 gap becomes clearer in the comparison below.
Bottom line: Naperville 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 Naperville has a cost index 18 points higher than the top-5 average of 104. That's not a marginal lead — it's a category of its own.
Rent ranges from $2,157/mo in Naperville to $1,151/mo in Rockford — a monthly difference of $1,006, or $12,072 per year.
150,245 residents · Illinois
What does daily life actually cost in Naperville? Start with the 17% rent-to-income ratio — that's the kind of margin that lets people build savings. On the category level, Utilities (index 112) is where the real savings show up, while Housing (index 154) is the line item most likely to surprise newcomers. Income at $150,937 and homes at $594,498 round out a profile that ranks #1 for clear reasons.
113,310 residents · Illinois
In plain English: Elgin earns its position at #2 through a combination that's hard to replicate. The 103 cost index sits 9 points below the national baseline, and the $88,316 — for better or worse — 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.
150,489 residents · Illinois
The #3 spot goes to Joliet, and the breakdown explains why. Renters here pay $1,559/month — which, honestly, is lower than you'd expect here — — saving renters $4,032 per year compared to the national average. You get the picture. 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.
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 (not adjusted for inflation, but still telling).
146,120 residents · Illinois
Rockford earns its position at #5 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.
Naperville ranks #1 in Illinois for this analysis with a cost index of 122 and median income of $150,937.
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.
Naperville (ranked #1) has a cost index of 122 and rent of $2,157/mo, while Rockford (ranked #5) has a cost index of 86 and rent of $1,151/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 Naperville is $2,157/month as of 2026, based on Zillow's Observed Rent Index. This is $262 above the national median of $1,895/month.
The median home price in Naperville is $594,498, which is 3.9× the local median income. It's on the edge of affordability for median-income households. 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.