United States Postal Service
Laborer Custodial
Mark Koster in 2025 was employed at United States Postal Service and had an annual salary of $58,736, according to public records. This salary was 8 percent lower than the average and 6 percent lower than the median salary in United States Postal Service.
United States Postal Service records show Mark Koster held two jobs from 2016 to 2025. From 2017 to 2025 Mark Koster held job of Laborer Custodial.
| Year | 2025 |
| Full Name | Mark Koster |
| Job Title | Laborer Custodial |
| Get Laborer Custodial Salary Statistics | |
| State | Federal |
| Employer | United States Postal Service |
| Location | IL - ARLINGTON HEIGHTS |
| Annual Wage | $58,736 |
| Pay Plan | |
| Grade | 04 |
*Information may include where available: salary, bonuses, benefits, retirement contributions, pensions, and other financial data.
| Employer Name | United States Postal Service |
| Year | 2025 |
| Number of Employees | 637,982 |
| Average Annual Wage | $64,181 |
| Median Annual Wage | $62,505 |
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