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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 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.
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.
Most rankings ignore this. We think it's the whole point: 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 (that's pre-tax, of course).
Here's Naperville by the numbers — and there's a lot to like. Cost index: 122. Rent: $2,157/month. Income: $150,937/year. Home price: $594,498. Population: 150,245. The strongest category is Utilities at 112; the most expensive is Housing at 154. Translate that rent to annual numbers, and residents are costing renters $3,144 more per year vs. the national median. That's an underrated factor in the decision.
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.
Frankly, Pair that with the housing data, and the pattern sharpens. The 5 cities we track in Illinois paint a clearly affordable picture. Average cost index: 104. Median rent: $1,779/month. Household income: $91,148. Illinois is known for Chicago's premium versus downstate bargains — and the data backs that reputation convincingly. Quietly competitive.
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 — 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
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.
113,310 residents · Illinois
A closer look at Elgin: the cost index of 103 — which, honestly, is lower than you'd expect here — breaks down to a Utilities index of 94 (strongest category) and a Healthcare index of 106 (weakest). Median rent is $1,736/month — 8% below the national median — while household income sits at $88,316, meaning locals spend about 24% of income on rent. Take it or leave it — the data is what it is. That's a healthy margin by any standard.
150,489 residents · Illinois
Dive into Joliet's numbers: cost index 97 (15 points below national average), rent $1,559/month, income $88,026, and a home price of $255,981. The city's cost profile isn't flat — Utilities is the cheapest category at 89, while Healthcare runs 100. With 150,489 residents, it balances mid-size city convenience with manageable costs.
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 — for better or worse — and homes at $312,457 round out a profile that ranks #4 for clear reasons.
146,120 residents · 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). 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.
| City | State Tax | Sales Tax | Property Tax | Est. Take-Home |
|---|---|---|---|---|
1Naperville | 4.95% | 8.83% | 1.73% | $102,652 |
2Elgin | 4.95% | 8.83% | 1.73% | $102,652 |
3Joliet | 4.95% | 8.83% | 1.73% | $102,652 |
4Chicago | 4.95% | 8.83% | 1.73% | $102,652 |
5Rockford | 4.95% | 8.83% | 1.73% | $102,652 |
Cities are ranked by median household income from Census ACS data. We also show cost-adjusted purchasing power (income ÷ cost index) to reveal which high-income cities actually deliver the most real-world spending power. 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.
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.