State comparison · 2025
Data Scientists salary: California vs Illinois
Data Scientists in California earn a median of $141,590. In Illinois, $106,560. After cost-of-living, the gap is 20% — not 32.9%.
Nominal pay gap
+32.9%
California vs Illinois
COL-adjusted gap
+20%
After BEA Regional Price Parities
California
Data Scientists
- Median
- $141,590
- p25
- $103,360
- p75
- $186,820
- p10
- $77,480
- p90
- $224,920
- COL index (BEA RPP)100 = US average
- 110.7
- Hiring velocity (180d)
- -39%
Illinois
Data Scientists
- Median
- $106,560
- p25
- $84,610
- p75
- $137,290
- p10
- $68,810
- p90
- $168,880
- COL index (BEA RPP)100 = US average
- 100.0
- Hiring velocity (180d)
- -50%
BLS Occupational Employment and Wage Statistics, May 2025. Cost-of-living adjustment from BEA Regional Price Parities (overall index). Hiring velocity from DOL OFLC public disclosure data, recent 180 days vs prior. See methodology.