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Crunching costs, sorting signals, rendering insights.
Crunching costs, sorting signals, rendering insights.
Let's be honest: Illinois isn't cheap. And depending on your situation, but within that premium market, there are cities where your dollar stretches meaningfully further. Rockford proves it with a cost index of 86 — which, honestly, is lower than you'd expect here — , the lowest in Illinois, and we'…
Let's be honest: Illinois isn't cheap. And depending on your situation, but within that premium market, there are cities where your dollar stretches meaningfully further. Rockford proves it with a cost index of 86 — which, honestly, is lower than you'd expect here — , the lowest in Illinois, and we've ranked all 5 contenders to help you find the best deal in an expensive landscape (that's pre-tax, of course).
On a $75K salary, the key number is $1,875/month — we had to double-check this one — — that's 30% of gross, the standard affordability line. Rockford ($1,151/mo, 18%), Joliet ($1,559/mo, 25%), Elgin ($1,736/mo, 28%) all clear that bar. After federal tax, FICA (7.65%), and state income tax, estimated take-home ranges from $53,997 to $53,997/year across these top picks.
Rockford earns its position at #1 through a combination that's hard to replicate. And in most cases, the 86 cost index sits 26 points below the national baseline, and the $53,328 — for better or worse — 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. Take it or leave it — the data is what it is. On the cost side, Housing leads the way at 66, while Healthcare trails at 89.
It checks most boxes — but the healthcare costs are the asterisk. In Rockford, the healthcare index sits at 89 — not a dealbreaker, but worth knowing about (not adjusted for inflation, but still telling).
Real talk: Bottom line: Rockford leads this ranking for clear, data-backed reasons — but the "best" city depends on your priorities. And from what we can tell, 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 (and that gap widens if you factor in state taxes).
#1 Ranked: Rockford — cost index 86, rent $1,151/mo, income $53,328
3 of 5 cities keep rent under 30% of $75K gross income
Data sourced from Census Bureau, Zillow, BLS, and Tax Foundation — current as of 2026
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 (though the trend is moving in the right direction).
150,489 residents · Illinois
Frankly, Dive into Joliet's numbers: cost index 97 — this is the part where it gets real — (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.
113,310 residents · Illinois
The #3 spot goes to Elgin, and the breakdown explains why. Renters here pay $1,736/month — which, honestly, is lower than you'd expect here — — saving renters $1,908 per year compared to the national average. Meanwhile, Utilities is the standout at index 94, keeping costs manageable. The weak spot? Healthcare at 106. At a 24% rent-to-income ratio, there's genuine breathing room in the average household budget.
150,245 residents · Illinois
In plain English: 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 a strong position by any measure.
2,664,452 residents · Illinois
A closer look at Chicago: the cost index of 111 breaks down to a Utilities index of 102 (strongest category) and a Housing index of 127 (weakest). Median rent is $2,292/month — 21% above the national median — while household income sits at $75,134, meaning locals spend about 37% of income on rent. That exceeds the recommended 30% threshold — affordability here depends on earning above the median.
| City | State Tax | Sales Tax | Property Tax | Est. Take-Home |
|---|---|---|---|---|
1Rockford | 4.95% | 8.83% | 1.73% | $53,997 |
2Joliet | 4.95% | 8.83% | 1.73% | $53,997 |
3Elgin | 4.95% | 8.83% | 1.73% | $53,997 |
4Naperville | 4.95% | 8.83% | 1.73% | $53,997 |
5Chicago | 4.95% | 8.83% | 1.73% | $53,997 |
Rockford ranks #1 in Illinois for this analysis with a cost index of 86 and median income of $53,328.
Yes. On a $75K salary in Rockford, rent would consume about 18% of your gross monthly income. Financial experts recommend keeping rent under 30%. You're well within that guideline.
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 Chicago (ranked #5) has a cost index of 111 and rent of $2,292/mo — a 25-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.
After federal taxes, FICA (7.65%), and 4.95% state income tax, estimated take-home on $75K in Rockford is approximately $53,997/year ($4,500/month). After median rent of $1,151/month, you'd have roughly $40,185/year for all other expenses.
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.