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Core Based Statistical Area (CBSA) Definitions

April 5, 2025

Metropolitan Statistical Areas (MSAs), Combined Statistical Areas (CSAs), Micropolitan Statistical Areas (MICROs), and Metropolitan Divisions (MDIVs) in the Woods & Poole database are as defined in the July 2023, Office of Management and Budget (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”, except for metros containing Connecticut planning regions.

All Woods & Poole historical data back to 1969 are revised to reflect the new 2023 OMB. Metropolitan Area (MSA, CSA, MICRO, and MDIV) definitions, except for metros containing Connecticut planning regions which are based on 2020 OMB definitions based on Connecticut legacy counties. There are 385 MSAs, 181 CSAs, 536 MICROs, and 37 MDIVs in the 2024 Woods & Poole database.

OMB 2023 metro areas that include one or more Connecticut planning region are not included in the 2024 Woods & Poole database. The following OMB July […]

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