As a factual backdrop for the ongoing arguments about whether or how much to raise the minimum wage, a useful starting point is the most recent version of the annual report from the US Bureau of Labor Statistics on “Characteristics of Minimum Wage Workers, 2016” (published April 2017). It begins:

“In 2016, 79.9 million workers age 16 and older in the United States were paid at hourly rates, representing 58.7 percent of all wage and salary workers. Among those paid by the hour, 701,000 workers earned exactly the prevailing federal minimum wage of $7.25 per hour. About 1.5 million had wages below the federal minimum. Together, these 2.2 million workers with wages at or below the federal minimum made up 2.7 percent of all hourly paid workers. The percentage of hourly paid workers earning the prevailing federal minimum wage or less declined from 3.3 percent in 2015 to 2.7 percent in 2016. This remains well below the percentage of 13.4 recorded in 1979, when data were first collected on a regular basis …” 

The report is mostly a series of tables, which the interested reader will want to pick through. Here are some highlights from the 2016 data as selected by BLS (parenthetical references to specific supporting tables omitted):

Age. Minimum wage workers tend to be young. Although workers under age 25 represented only about one-fifth of hourly paid workers, they made up about half of those paid the federal minimum wage or less. Among employed teenagers (ages 16 to 19) paid by the hour, about 10 percent earned the minimum wage or less, compared with about 2 percent of workers age 25 and older.  … 

Education. Among hourly paid workers age 16 and older, about 5 percent of those without a high school diploma earned the federal minimum wage or less, compared with about 3 percent of those who had a high school diploma (with no college), 3 percent of those with some college or an associate degree, and about 2 percent of college graduates. …