The companies

42.5: Median employee count

$9.9 million: Median 2008 revenue

880.5%: Median growth rate

The CEOs

90%: Male

10%: Female

21%: Minority

Age

1%: Under 25

27%: 25 to 35

41%: 36 to 45

22%: 46 to 55

9%: Over 55

Marital Status

80%: Married

5%: Divorced

15%: Single

Demographic data drawn from the 250 responses to an online survey of Inc. 500 CEOs.