The participation rate measures the share of the civilian noninstitutional population age 16 and older who work or actively seek work. Its universe is the civilian noninstitutional population age 16 and older in the 50 states and District of Columbia. It excludes active military and people living in institutions, while foreign citizens residing outside embassies are included.
The source is Labor Force Statistics from the Current Population Survey, a monthly survey of about 60000 households conducted for the Bureau of Labor Statistics. The publisher states no target for the rate. Higher means a larger share works or seeks work, while lower means a smaller share does so. Read it with the unemployment rate and the employment population ratio for full context.