The OES program measures the number of people employed in each occupation and also provides information about their wages. Estimates are produced for the states, Metropolitan Statistical Areas (MSAs), and non-metropolitan areas. Arizona also provides unofficial estimates for counties. Employment estimates exclude people who are self-employed. Occupations are classified according to the Standard Occupational Classification system (SOC).
Information about occupations is collected in a semi-annual survey of establishments. Estimates are released annually and are based on the previous three years of survey data. Wage information for the first two years is adjusted for inflation based on information from the National Compensation Survey.
Technical Notes and FAQ for OES estimates are on bls.gov.