Source: U.S. Bureau of Labor Statistics  

Release: State Employment and Unemployment  

Units:  Thousands of Persons, Not Seasonally Adjusted

Frequency:  Monthly

The United States Office of Management and Budget (OMB) delineates metropolitan and micropolitan statistical areas according to published standards that are applied to Census Bureau data. The boundaries of statistical areas are periodically revised and are subject to change. For additional information, see here (https://www.census.gov/programs-surveys/metro-micro.html)