Bureau of Labor Statistics (BLS) publishes a large amount of information on the wages, earnings, and benefits of workers.
Sample Salary Graphics for Science Career Chemist: $73,740
Example bar graph shows the median chemist salary, mean US annual wage and the US minimum wage

ONet http://online.onetcenter.org
BLS http://www.bls.gov/emp/, https://www.bls.gov/oes/current/oes_nat.htm, https://www.bls.gov/oes/current/oes_nat.htm#19-0000
DOL http://www.dol.gov/dol/topic/wages/minimumwage.htm

Free science fair projects.