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There are roughly 6,210 hospitals across the U.S., according to the American Hospital Association. From cleaners to CEOs, here are some of the 30 most common occupations and how much they make, according to an article from Business Insider.

At the number 30 spot are janitors and cleaners, who — except maids and housekeeping cleaners — earn a median of $29,820 a year. There are 73,250 janitors and cleaners employed in hospitals.

This salary is higher than environmental services pay scales outlined by Facility Cleaning Decisions readers in the 2017 Salary Survey. It's also only about half of what Directors of Environmental Services make. According to the survey, directors are bringing in an average of $59,000 a year — sometimes more, depending on the size of their staffs.

For context, Business Insider shared a few more hospital employee groups (and their rankings), both clinical and other.

29. Orderlies earn a median of $30,200 a year. There are 39,880 employed in hospitals.

27. Cooks (institution and cafeteria) earn a median of $31,930 a year. There are 35,050 employed in hospitals.

25. Security guards earn a median of $36,680 a year. There are 43,130 employed in hospitals.

17. Radiologic technologists earn a median of $62,760 a year. There are 123,820 employed in hospitals.

15. Registered nurses earn a median of $77,670 a year. There are 1,800,850 employed in hospitals.

9. Pharmacists earn a median of $125,430 a year. There are 80,010 employed in hospitals.

5. Family and general practitioners earn a median of $206,430 a year. There are 21,260 employed in hospitals.

2. Surgeons earn a median of $226,080 a year. There are 7,220 employed in hospitals.

1. Chief executives earn a median of $242,550 a year. There are 4,440 employed in hospitals.

For those looking for advice on negotiating for higher pay, click here.