Geologist Salary in Illinois
The median geologist salary in Illinois is $79,496 per year, which is 5% below the national median of $83,680.
Geologist Salary Overview in Illinois (2026)
Illinois ranks #24 out of 50 states for geologist compensation. Illinois falls in the middle of the pack for geologist pay, offering salaries near the national average. At $79,496 per year, geologists in Illinois earn $4,184 less than the national median of $83,680.
Illinois's cost of living is near the national average at 95%, meaning geologist salaries here translate closely to their face value in purchasing power.
The salary spread in Illinois is significant: geologists at the 10th percentile earn $48,450, while those at the 90th percentile bring home $140,600 — a $92,150 gap that reflects differences in experience, specialization, employer type, and metro area. The highest-paying city in Illinois for this role is Naperville, where the median reaches $90,374.
Nationally, geologist employment is projected to grow 5% over the next decade (faster than average). This steady growth indicates stable demand for geologists across the country.
Geologist Salary in Illinois by Experience
In Illinois, an entry-level geologist earns around $51,300, while experienced professionals earn up to $133,000 per year. The cost of living index in Illinois is 95% of the national average.
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See Investment Options →Salary Percentiles in Illinois
| Percentile | IL Salary |
|---|---|
| 10th Percentile | $48,450 |
| 25th Percentile | $59,850 |
| Median (50th) | $79,496 |
| 75th Percentile | $106,400 |
| 90th Percentile | $140,600 |
Geologist Salary by City in Illinois
The largest employment areas for geologists in Illinois include Chicago, Aurora, Naperville, and Rockford. Salaries vary by city based on local cost of living and demand.
How to Become a Geologist in Illinois
Education
Most geologist positions require a bachelor's degree. Illinois has several accredited institutions offering relevant programs.
Key Skills
Job Outlook in Illinois
Nationally, geologist employment is projected to grow 5% over the next decade (faster than average). Illinois's demand may vary based on local industry trends.
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Data shows Geologists who negotiate earn 7–15% more. A single negotiation could add $53,504 over your career trajectory.
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