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Crunching costs, sorting signals, rendering insights.
Crunching costs, sorting signals, rendering insights.
The 30% rule — spending no more than 30% of gross income on housing — is the most widely cited benchmark for affordability. On a $150K salary, 5 cities (100%) meet this threshold. You've got plenty of choices. We ran the numbers on 5 cities in Illinois using 2026 census, rent, and salary data. Rockf…
The 30% rule — spending no more than 30% of gross income on housing — is the most widely cited benchmark for affordability. On a $150K salary, 5 cities (100%) meet this threshold. You've got plenty of choices.
#1-ranked Rockford has a cost index 37 points lower than the top-5 average of 104. That's not a marginal lead — it's a category of its own.
Rent ranges from $1,151/mo in Rockford to $2,292/mo in Chicago — a monthly difference of $1,141, or $13,692 per year.
Rent in #1-ranked Rockford has increased from $1,087 to $1,151/mo over the past 12 months — a 6% increase. Rising costs may erode its top ranking over time.
The 30% rule — spending no more than 30% of gross income on housing — is the most widely cited benchmark for affordability. On a $150K salary, 5 cities (100%) meet this threshold. You've got plenty of choices. We ran the numbers on 5 cities in Illinois using 2026 census, rent, and salary data. Rockford comes out on top — here's the full ranking and analysis.
A closer look at Rockford: the cost index of 67 breaks down to a Housing index of 67 (strongest category) and a Healthcare index of 93 (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.
On a $150K salary, the key number is $3,750/month — that's 30% of gross, the standard affordability line. Rockford ($1,151/mo, 9%), Joliet ($1,559/mo, 12%), Elgin ($1,736/mo, 14%) all clear that bar. After federal tax, FICA (7.65%), and state income tax, estimated take-home ranges from $102,058 to $102,058/year across these top picks.
We ran the numbers three times. And for many people, the result held every time: 5 of 5 cities keep rent under 30% of $150K. The 30% rule — spending no more than 30% of gross income on housing — is the most widely cited benchmark for affordability. On a $150K salary, 5 cities (100%) meet this threshold. You've got plenty of choices. In a market where everything is going up, this stands still — in a good way (a figure that keeps climbing, by the way).
The counter-argument is worth hearing: Across Illinois, the average cost of living index is 104 — 7 points below the national median. And from what we can tell, known for Chicago's premium versus downstate bargains, the state offers 5 tracked cities with median rents averaging $1,779/month. That's $116 less than the national average of $1,895. If you've ever felt priced out, the numbers here offer a different path.
Bottom line: Rockford 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: Rockford — cost index 67, rent $1,151/mo, income $53,328
5 of 5 cities keep rent under 30% of $150K
5 of 5 cities keep rent under 30% of $150K gross income
Data sourced from Census Bureau, Zillow, BLS, and Tax Foundation — current as of 2026
146,120 residents · Illinois
Why Rockford ranks #1: the numbers tell a clear story. And for many people, that tracks. At 67 on the cost index, residents save roughly 44% less than the typical American. Rent sits at $1,151/month while the median household pulls in $53,328/year. The Housing category is particularly strong at 67, though Healthcare (93) lags behind. Home prices average $172,610 — $294,760 below the national median.
150,489 residents · Illinois
In plain English: the #2 spot goes to Joliet, and the breakdown explains why. Renters here pay $1,559/month — saving renters $4,032 per year compared to the national average. Meanwhile, Housing is the standout at index 91, keeping costs manageable. The weak spot? Healthcare at 98. At a 21% rent-to-income ratio, there's genuine breathing room in the average household budget.
113,310 residents · Illinois
Why Elgin ranks #3: the numbers tell a clear story. At 101 on the cost index, residents save roughly 10% less than the typical American. Rent sits at $1,736/month while the median household pulls in $88,316/year. The Healthcare category is particularly strong at 100, though Housing (101) lags behind. Home prices average $323,259 — $144,111 below the national median.
150,245 residents · Illinois
Naperville earns its position at #4 through a combination that's hard to replicate. And generally speaking, the 126 cost index sits 15 points above the national baseline, and the $150,937 median income means purchasing power here is partially offset by higher costs. Homes list at $594,498 — $127,128 above the national median, reflecting the local market dynamics. On the cost side, Healthcare leads the way at 105, while Housing trails at 126 (not adjusted for inflation, but still telling).
2,664,452 residents · Illinois
Why Chicago ranks #5: the numbers tell a clear story. At 134 on the cost index, residents spend roughly 23% more than the typical American. Rent sits at $2,292/month while the median household pulls in $75,134/year. The Healthcare category is particularly strong at 107, though Housing (134) lags behind. Home prices average $312,457 — $154,913 below the national median (that's pre-tax, of course).
| City | State Tax | Sales Tax | Property Tax | Est. Take-Home |
|---|---|---|---|---|
1Rockford | 4.95% | 8.83% | 1.73% | $102,058 |
2Joliet | 4.95% | 8.83% | 1.73% | $102,058 |
3Elgin | 4.95% | 8.83% | 1.73% | $102,058 |
4Naperville | 4.95% | 8.83% | 1.73% | $102,058 |
5Chicago | 4.95% | 8.83% | 1.73% | $102,058 |
Rockford ranks #1 in Illinois for this analysis with a cost index of 67 and median income of $53,328.
Yes. On a $150K salary in Rockford, rent would consume about 9% 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 67 and rent of $1,151/mo, while Chicago (ranked #5) has a cost index of 134 and rent of $2,292/mo — a 67-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 $150K in Rockford is approximately $102,058/year ($8,505/month). After median rent of $1,151/month, you'd have roughly $88,246/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.