As of April 01, 2025, the average annual salary for a Senior Biologist in Illinois is $84,700. According to Salary.com, salaries can range from a low of $66,742 to a high of $101,894, with most professionals earning between $75,300 and $93,700.
| Annual Salary |
Monthly Pay |
Weekly Pay |
Hourly Wage |
|
| 75th Percentile | $91,853 | $7,654 | $1,766 | $44 |
| Average | $83,024 | $6,919 | $1,597 | $40 |
| 25th Percentile | $73,802 | $6,150 | $1,419 | $35 |
An entry-level Senior Biologist with under 1 year experience makes about $80,505. With less than 2 years of experience, a mid-level Senior Biologist makes around $81,205. After 2-4 years, the Senior Biologist pay rises to about $82,604. Those senior Senior Biologist with 5-8 years of experience earn roughly $87,381, and those Senior Biologist having 8 years or more experience are expected to earn about $89,791 on average.
| Levels | Salary |
|---|---|
| Entry Level Senior Biologist | $80,505 |
| Intermediate Level Senior Biologist | $81,205 |
| Senior Level Senior Biologist | $82,604 |
| Specialist Level Senior Biologist | $87,381 |
| Expert Level Senior Biologist | $89,791 |
| Entry Level | 3% |
| Mid Level | 2% |
| Senior Level | 1% |
| Top Level | 5% |
| Experienced | 8% |
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