As of May 01, 2025, the average annual salary for a Mechanical Engineer I in O Fallon, MO is $76,197. Salary.com reports that pay typically ranges from $69,117 to $81,262, with most professionals earning between $62,671 and $85,874.
| Annual Salary |
Monthly Pay |
Weekly Pay |
Hourly Wage |
|
| 75th Percentile | $81,262 | $6,772 | $1,563 | $39 |
| Average | $76,197 | $6,350 | $1,465 | $37 |
| 25th Percentile | $69,117 | $5,760 | $1,329 | $33 |
An entry-level Mechanical Engineer I with under 1 year experience makes about $75,669. With less than 2 years of experience, a mid-level Mechanical Engineer I makes around $76,197. After 2-4 years, the Mechanical Engineer I pay rises to about $77,104. Those senior Mechanical Engineer I with 5-8 years of experience earn roughly $77,709, and those Mechanical Engineer I having 8 years or more experience are expected to earn about $77,860 on average.
| Levels | Salary |
|---|---|
| Entry Level Mechanical Engineer I | $75,669 |
| Intermediate Level Mechanical Engineer I | $76,197 |
| Senior Level Mechanical Engineer I | $77,104 |
| Specialist Level Mechanical Engineer I | $77,709 |
| Expert Level Mechanical Engineer I | $77,860 |
| Entry Level | 5% |
| Mid Level | 4% |
| Senior Level | 3% |
| Top Level | 2% |
| Experienced | 2% |
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