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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. Naperville (index 122, rent $2,157/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: 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
Nobody expects rock-bottom prices in Illinois — but that doesn't mean all cities are equally expensive. Naperville (index 122, rent $2,157/mo) carves out real savings within a high-cost market. We analyzed 5 cities to find where your money goes furthest in 2026.
Before making assumptions, look at this: 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 a difference you notice every single month.
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 about what we'd expect given the state context. On a fixed income, this is the metric that matters most.
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); Chicago (index 111, rent $2,292); Elgin (index 103, rent $1,736). Each city profile below links to the full detail page with 12-month trends, salary breakdowns, and cost category comparisons.
The state-level view adds helpful context here. Illinois — Chicago's premium versus downstate bargains. The 5 cities we track here average a cost index of 104 and median income of $91,148. It's a clear buyer's market compared to national norms. The typical rent runs $1,779/month, which is $116 less than the national median.
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.
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.
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. That could be a concern depending on your priorities.
113,310 residents · Illinois
Elgin earns its position at #3 through a combination that's hard to replicate. The 103 cost index sits 9 points below the national baseline, and the $88,316 — a detail that tends to get overlooked — median income means purchasing power here is genuinely above average. Fairly typical for a city this size. 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
A closer look at Joliet: the cost index of 97 — we had to double-check this one — breaks down to a Utilities index of 89 (strongest category) and a Healthcare index of 100 (weakest). That alone makes it worth considering. 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.
146,120 residents · Illinois
Dive into Rockford's numbers: cost index 86 (26 points below national average), rent $1,151/month, income $53,328, and a home price of $172,610. The city's cost profile isn't flat — Housing is the cheapest category at 66, while Healthcare runs 89. With 146,120 residents, it balances mid-size city convenience with manageable costs.
Cities are ranked by overall cost of living index in descending order. High-cost cities are typically driven by housing prices — a city with an index of 150 has overall costs roughly 50% above the national median, with housing often 2-3× that premium. 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.