Nationwide:
Adults (estimated)
Lifetime Prevalence: 30,957,478 (13.4%)
Current Prevalence: 19,504,178 (8.4%)

Children (estimated)
NA

Source & Notes:
Behavioral Risk Factor Surveillance Survey, 2009 (see p. 22)
NA indicates data is not available
Lifetime prevalence defined as answering yes to “Have you ever been told by a doctor, nurse or other health professional that you had asthma?”
Current prevalence defined as answering yes to “Have you ever been told by a doctor, nurse or other health professional that you had asthma?” and “Do you still have asthma?”