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Crunching costs, sorting signals, rendering insights.
Crunching costs, sorting signals, rendering insights.
On a student budget, the math is brutal: loans, part-time income, zero margin. We ranked 5 cities in Illinois on rent, food costs, and overall affordability. Rockford leads with rent at $1,151/mo and a food index of 89.
#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 $2,157/mo in Naperville — a monthly difference of $1,006, or $12,072 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.
Rockford (index 67) and Naperville (index 126) sit 59 points apart on the cost index — proof that Illinois is far from monolithic in affordability.
On a student budget, the math is brutal: loans, part-time income, zero margin. We ranked 5 cities in Illinois on rent, food costs, and overall affordability. Rockford leads with rent at $1,151/mo and a food index of 89.
Look, at $1,151/month for rent and a cost index of 67, Rockford is pretty much what you'd expect from a mid-size city in this part of the country. Income is $53,328. Nothing too surprising there (and that gap widens if you factor in state taxes).
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.
#1 Ranked: Rockford — cost index 67, rent $1,151/mo, income $53,328
Rockford is a clear outlier at index 67
Student-budget scoring: rent $1,151/mo, food index 89, cost index 67 — survival-level affordability
Data sourced from Census Bureau, Zillow, BLS, and Tax Foundation — current as of 2026
146,120 residents · Illinois
In plain English: Here's Rockford by the numbers — and there's a lot to like (and a little to watch). Cost index: 67. Rent: $1,151/month. Income: $53,328/year. Home price: $172,610. Population: 146,120. The strongest category is Housing at 67; the most expensive is Healthcare at 93. Translate that rent to annual numbers, and residents are saving renters $8,928 per year vs. It's fine. Not great, not bad. the national median. This is the kind of number that should get your attention.
150,489 residents · Illinois
At $1,559/month for rent and a cost index of 91, Joliet is pretty much what you'd expect from a mid-size city in this part of the country. Income is $88,026. It lines up with what you'd expect.
113,310 residents · Illinois
Elgin earns its position at #3 through a combination that's hard to replicate. The 101 cost index sits 10 points below the national baseline, and the $88,316 — worth pausing on — median income means purchasing power here is genuinely above average. Homes list at $323,259 — $144,111 below the national median — a genuine ownership opportunity. On the cost side, Healthcare leads the way at 100, while Housing trails at 101.
2,664,452 residents · Illinois
Real talk: Here's Chicago by the numbers — and there's a lot to like. Cost index: 134. Rent: $2,292/month. Income: $75,134/year. Home price: $312,457. Population: 2,664,452. The strongest category is Healthcare at 107; the most expensive is Housing at 134. Translate that rent to annual numbers, and residents are costing renters $4,764 more per year vs. the national median. This is one of those rare cities where the math works from every angle.
150,245 residents · Illinois
Why Naperville ranks #5: 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 — for better or worse — 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.
Our persona scoring model weights cost, income, rent, healthcare, taxes, and city size based on what matters most to students. Each factor scores 10-25 points out of a 100-point composite. The guide ranks every tracked city in Illinois by this personalized metric. 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.
Rockford ranks #1 in Illinois for this analysis with a cost index of 67 and median income of $53,328.
Rockford scores highest for students 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 Naperville (ranked #5) has a cost index of 126 and rent of $2,157/mo — a 59-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.