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Crunching costs, sorting signals, rendering insights.
Crunching costs, sorting signals, rendering insights.
The gap here is wider than it has any right to be: Rockford is a clear outlier at index 67. #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. This is where the math gets real for actual people.
#1 Ranked: Rockford — cost index 67, rent $1,151/mo, income $53,328
Rockford is a clear outlier at index 67
Singles scoring: rent $1,151/mo (solo housing), cost index 67, population 146,120 — livability on one income
Data sourced from Census Bureau, Zillow, BLS, and Tax Foundation — current as of 2026
The gap here is wider than it has any right to be: Rockford is a clear outlier at index 67. #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. This is where the math gets real for actual people.
Single-income living requires cities where one paycheck covers everything. We scored 5 cities across Illinois on rent, cost of living, and population. Rockford ($1,151/mo, 146,120 residents) ranks #1. An outlier in the best sense.
A closer look at Rockford: the cost index of 67 — we had to double-check this one — breaks down to a Housing index of 67 (strongest category) and a Healthcare index of 93 (weakest). And from what we can tell, 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.
That said, Illinois — Chicago's premium versus downstate bargains. And more often than not, 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.
What to do with this data: use the ranking as a shortlist, then dig into the city profiles for trend lines and category breakdowns. The difference between #1 and #5 is often smaller than the difference between "good on paper" and "actually fits my life." Compare your top picks with our calculator to see real take-home numbers.
146,120 residents · Illinois
The #1 spot goes to Rockford, and the breakdown explains why. And on balance, renters here pay $1,151/month — which, honestly, is lower than you'd expect here — — saving renters $8,928 per year compared to the national average. Meanwhile, Housing is the standout at index 67, making it one of the cheapest in the country for that category. The weak spot? Healthcare at 93. A 26% rent-to-income ratio keeps most households inside the safe zone.
150,489 residents · Illinois
The #2 spot goes to Joliet, and the breakdown explains why. And as a general rule, 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.
2,664,452 residents · Illinois
The #3 spot goes to Chicago, and the breakdown explains why. Renters here pay $2,292/month — we had to double-check this one — — costing renters $4,764 more per year compared to the national average. Meanwhile, Healthcare is the standout at index 107, keeping costs manageable. The weak spot? Housing at 134. The 37% rent-to-income ratio is a pressure point — for median earners, housing takes more than recommended.
150,245 residents · Illinois
In plain English: Dive into Naperville's numbers: cost index 126 — for better or worse — (15 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 — Healthcare is the cheapest category at 105, while Housing runs 126. With 150,245 residents, it balances mid-size city convenience with manageable costs (that's pre-tax, of course).
113,310 residents · Illinois
The #5 spot goes to Elgin, and the breakdown explains why. It lines up with what you'd expect. Renters here pay $1,736/month — saving renters $1,908 per year compared to the national average. Meanwhile, Healthcare is the standout at index 100, keeping costs manageable. The weak spot? Housing at 101. At a 24% rent-to-income ratio, there's genuine breathing room in the average household budget.
Rockford ranks #1 in Illinois for this analysis with a cost index of 67 and median income of $53,328.
Rockford scores highest for singles due to its below-average cost of living, median rent of $1,151/mo, and competitive median income of $53,328.
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 Elgin (ranked #5) has a cost index of 101 and rent of $1,736/mo — a 34-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.
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.