Senior Mechanical Engineer salary in St. Louis, MO
Based on 12 certified H-1B filings at DOL wage level III in the St. Louis, MO-IL metro area, FY2025–FY2026. Includes St Louis, St. Charles, Washington, Edwardsville, Saint Louis.
Also listed as: Mechanical Design Engineer
Salary range
| Percentile | Salary |
|---|---|
| 10th | $93,371 |
| 25th | $93,371 |
| 50th (median) | $94,775 |
| 75th | $100,245 |
| 90th | $103,698 |
Cost of living
St. Louis's median senior Mechanical Engineer salary of $94,775 is worth about $99,700 at national average prices.
Source: BEA Regional Price Parities, 2024 (U.S. = 100; St. Louis = 95.1).
Compared with all workers here
All Mechanical Engineers in the St. Louis, MO area earned a median of $100,340 in May 2025 (2,190 employed). The H-1B median here is $94,775, 6% lower.
Source: U.S. Bureau of Labor Statistics, OEWS metropolitan area estimates. BLS wages include some incentive pay; H-1B figures are base salary.
Employers filing at this level
| Employer | Median | Filings |
|---|---|---|
| Gillespie & Powers | too few | 2 |
| L&T Technology Services | too few | 2 |
Employers with at least 2 filings here. Median shown at 10+ filings.
By experience level
| Wage level | Median | Filings |
|---|---|---|
| Entry-level · Level I | too few | 3 |
| Mid-level · Level II | $82,100 | 24 |
| Senior · Level III | $94,775 | 12 |
| Expert · Level IV | – | 0 |
Median shown when a level has at least 10 filings.
Minimum H-1B salary by level
| Wage level | Prevailing wage (most common) | Median offered salary | Filings |
|---|---|---|---|
| Mid-level · Level II | $80,184 | $82,100 | 24 |
| Senior · Level III | $93,371 | $94,775 | 12 |
The prevailing wage is the minimum an employer must pay for this job and area. Amounts vary by county within a metro and by wage source.