0 All establishment sizes 1 Fewer than 5 employees per establishment 2 5 to 9 employees per establishment 3 10 to 19 employees per establishment 4 20 to 49 employees per establishment 5 50 to 99 employees per establishment 6 100 to 249 employees per establishment 7 250 to 499 employees per establishment 8 500 to 999 employees per establishment 9 1000 or more employees per establishment