OMB Bulletin No. 23-01, Revised Delineations of Metropolitan Statistical Areas, Micropolitan Statistical Areas, and Combined Statistical Areas, and Guidance on Uses of the Delineations of These Areas
Outlines the Metropolitan Statistical Areas, Micropolitan Statistical Areas, Combined Statistical Areas, and Metropolitan Division – collectively called Core Based Statistical Areas (CBSAs) – for the United States and Puerto Rico. Reflects the 2020 Standards for Delineating Core Based Statistical Areas published by the Office of Management and Budget (OMB) in July 2021 and the application of those standards to Census population and journey-to-work data, including the 2020 Decennial Census, American Community Survey, and Census Population Estimates Program data. Also provides guidance on the use of these delineations.
Office of Management and Budget
Policy · Rural definitions · Rural-urban differences