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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 $30K salary, 0 cities (0%) meet this threshold. That's a tough market. We ran the numbers on 5 cities in Illinois using 2026 census, rent, and salary data. Rockford comes …
#1 Ranked: Rockford — cost index 67, rent $1,151/mo, income $53,328
0 of 5 cities keep rent under 30% of $30K
0 of 5 cities keep rent under 30% of $30K gross income
Data sourced from Census Bureau, Zillow, BLS, and Tax Foundation — current as of 2026
The 30% rule — spending no more than 30% of gross income on housing — is the most widely cited benchmark for affordability. On a $30K salary, 0 cities (0%) meet this threshold. That's a tough market. 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.
Dive into Rockford's numbers: cost index 67 (44 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 67, while Healthcare runs 93. With 146,120 residents, it balances mid-size city convenience with manageable costs.
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.
The 30% rule — spending no more than 30% of gross income on housing — is the most widely cited benchmark for affordability. On a $30K salary, 0 cities (0%) meet this threshold. That's a tough market.
#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.
146,120 residents · Illinois
Why Rockford ranks #1: the numbers tell a clear story. 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
Joliet earns its position at #2 through a combination that's hard to replicate. The 91 cost index sits 20 points below the national baseline, and the $88,026 median income means purchasing power here is genuinely above average. Homes list at $255,981 — $211,389 below the national median — a genuine ownership opportunity. On the cost side, Housing leads the way at 91, while Healthcare trails at 98.
113,310 residents · Illinois
A closer look at Elgin: the cost index of 101 breaks down to a Healthcare index of 100 (strongest category) and a Housing index of 101 (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. That's a healthy margin by any standard.
150,245 residents · Illinois
Why Naperville ranks #4: the numbers tell a clear story. At 126 on the cost index, residents spend roughly 15% more than the typical American. Rent sits at $2,157/month while the median household pulls in $150,937/year. The Healthcare category is particularly strong at 105, though Housing (126) lags behind. Home prices average $594,498 — $127,128 above the national median.
2,664,452 residents · Illinois
So, Chicago. Cost index of 134, rent at $2,292/month. It's higher than the national average. Median income is $75,134, which is below the national median. It's fine. Not great, not bad.
| City | State Tax | Sales Tax | Property Tax | Est. Take-Home |
|---|---|---|---|---|
1Rockford | 4.95% | 8.83% | 1.73% | $22,852 |
2Joliet | 4.95% | 8.83% | 1.73% | $22,852 |
3Elgin | 4.95% | 8.83% | 1.73% | $22,852 |
4Naperville | 4.95% | 8.83% | 1.73% | $22,852 |
5Chicago | 4.95% | 8.83% | 1.73% | $22,852 |
Rockford ranks #1 in Illinois for this analysis with a cost index of 67 and median income of $53,328.
Yes. On a $30K salary in Rockford, rent would consume about 46% of your gross monthly income. Financial experts recommend keeping rent under 30%. It's tight — consider a roommate or nearby suburb.
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 $30K in Rockford is approximately $22,852/year ($1,904/month). After median rent of $1,151/month, you'd have roughly $9,040/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.