Overall
- Casper
- 93.8
- Chicago-Naperville-Elgin
- 103.6
Diff +9.8 RPP
Casper vs Chicago-Naperville-Elgin
Cost of living comparison based on BEA Regional Price Parities. Chicago-Naperville-Elgin is 10.4% more expensive than Casper.
10.4% more expensive
Chicago-Naperville-Elgin, IL-IN is 10.4% more expensive than Casper, WY on BEA Regional Price Parities (overall RPP 103.6 vs 93.8). A $100,000 salary in Casper buys about the same as $110,408 in Chicago-Naperville-Elgin; the largest component gap is rents.
- Overall RPP 93.8 (Casper) vs 103.6 (Chicago-Naperville-Elgin)
- $100k in Casper ≈ $110,408 purchasing power in Chicago-Naperville-Elgin
- Rents drives the gap (+37.8 RPP points)
RPP parity plate
Pair WY:IL 93.8→103.6
TIER-GAP · CROSS-STATE · RENT-LED · BENCH-CROSS · PP-SHIFT
- TIER-GAP Clear tier gap
- CROSS-STATE WY × IL
- RENT-LED Rent-led gap
- BENCH-CROSS Benchmark cross
- PP-SHIFT PP shift
Instrument codes from this pair's BEA Regional Price Parities (overall · goods · services · rents · national benchmark 100 · purchasing-power conversion), not a ranking or recommendation.
Salary Equivalents
What a salary in Casper would need to be in Chicago-Naperville-Elgin for the same purchasing power:
| In Casper | In Chicago-Naperville-Elgin | Difference |
|---|---|---|
| $50,000 | $55,204 | +$5,204 |
| $75,000 | $82,806 | +$7,806 |
| $100,000 | $110,408 | +$10,408 |
| $150,000 | $165,612 | +$15,612 |
$ in Casper = in Chicago-Naperville-Elgin
Same BEA Regional Price Parity ratio as the table above (93.8 → 103.6), computed live from your number, nothing is sent anywhere.
What This Comparison Actually Tells You
Casper, WY and Chicago-Naperville-Elgin, IL-IN sit in clearly different price tiers, separated by 9.8 RPP points. At this distance, treating the same nominal salary as equivalent would materially change purchasing power.
This route crosses the national benchmark: Chicago-Naperville-Elgin is above 100 while Casper is below it. That makes the move a change of price regime, not merely a rank swap.
Rents leads the difference, with Chicago-Naperville-Elgin 37.8 points higher than Casper. Goods, services, and rents all point in the same broad direction, making the headline comparison more transferable across household types.
Comparable population context is incomplete for this pair, so no market-scale explanation is inferred from the price indexes.
For a housing-sensitive move, validate the rent gap first: HUD Fair Market Rent and the actual unit size can overturn what the blended index implies. On the BEA ratio alone, $100,000 in Casper corresponds to $110,408 in Chicago-Naperville-Elgin.
Category Breakdown
Goods
- Casper
- 95.4
- Chicago-Naperville-Elgin
- 107.3
Diff +11.9 RPP
Services
- Casper
- 78.9
Diff +4.7 RPP
Rents
- Casper
- 74.2
- Chicago-Naperville-Elgin
- 112.0
Diff +37.8 RPP
| Category | Casper | Chicago-Naperville-Elgin | Difference |
|---|---|---|---|
| Overall | 93.8 | 103.6 | +9.8 |
| Goods | 95.4 | 107.3 | +11.9 |
| Services | 78.9 | 83.6 | +4.7 |
| Rents | 74.2 | 112.0 | +37.8 |
Visual Comparison
Overall
Casper 93.8
Chicago-Naperville-Elgin 103.6
Goods
Casper 95.4
Chicago-Naperville-Elgin 107.3
Services
Casper 78.9
Chicago-Naperville-Elgin 83.6
Rents
Casper 74.2
Chicago-Naperville-Elgin 112.0
Vertical line = national average (100)
Casper
93.8
Cost Index
Chicago-Naperville-Elgin
103.6
Cost Index
How the Price Gap Changed
Casper and Chicago-Naperville-Elgin share 17 published annual releases from 2008 through 2024. Their overall gap narrowed, moving from 13.1 to 9.8 RPP points. Chicago-Naperville-Elgin remained the higher-index metro in the latest release.
Services changed the most within this pair: its gap moved 16.7 points between the first and latest shared releases (21.4 to 4.7 points). This describes a relative price-index history, not a forecast or a household budget.
| Release Year | Casper RPP | Chicago-Naperville-Elgin RPP | Relative Gap |
|---|---|---|---|
| 2008 | 92.3 | 105.4 | 13.1 points Chicago-Naperville-Elgin higher |
| 2012 | 99.2 | 105.1 | 5.9 points Chicago-Naperville-Elgin higher |
| 2016 | 97.6 | 103.8 | 6.2 points Chicago-Naperville-Elgin higher |
| 2020 | 93.3 | 104.5 | 11.1 points Chicago-Naperville-Elgin higher |
| 2024 | 93.8 | 103.6 | 9.8 points Chicago-Naperville-Elgin higher |
Annual BEA Regional Price Parity releases; a higher index means a higher price level relative to the national average of 100. Selected years shown from the full shared series.
Frequently Asked Questions
Is Chicago-Naperville-Elgin more expensive than Casper?
Chicago-Naperville-Elgin is 10.4% more expensive than Casper. The overall cost index is 103.6 vs 93.8 (national average = 100).
What salary in Chicago-Naperville-Elgin equals $100K in Casper?
A $100,000 salary in Casper has the same purchasing power as $110,408 in Chicago-Naperville-Elgin. This is based on the BEA Regional Price Parity indexes.
How do rents compare between Casper and Chicago-Naperville-Elgin?
Rents in Casper are indexed at 74.2 while Chicago-Naperville-Elgin is at 112.0 (national average = 100). Chicago-Naperville-Elgin has higher rents.
Data sources
- BEA Regional Price Parities (RPP), the cost-of-living indices shown on this page
- U.S. Census Bureau, American Community Survey (ACS), gross-rent observations behind the rents component
- BLS Consumer Price Index (CPI), goods and services price relatives
- BLS Occupational Employment and Wage Statistics (OEWS), labor-driven services component
- HUD Fair Market Rents (FMR), 40th-percentile rent cross-reference
Every figure on PlainCost is rendered directly from BEA Regional Price Parity source data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, our changelog, or report a data error. Data current as of 2026-08-11. Rankings measure the published cost-of-living index only; we don't recommend where to live or rate any metro's quality of life.