TheU.S.State of Maine currently has fivestatistical areas that have been delineated by theOffice of Management and Budget (OMB). On July 21, 2023, the OMB delineated onecombined statistical area, threemetropolitan statistical areas, and onemicropolitan statistical area in Maine.^[1] As of 2023, the largest of these is thePortland-Lewiston-South Portland, ME CSA, comprising the region around Maine's largest city ofPortland.

TheOffice of Management and Budget (OMB) has designated more than 1,000statistical areas for theUnited States andPuerto Rico.^[2] These statistical areas are important geographic delineations of population clusters used by the OMB, theUnited States Census Bureau, planning organizations, and federal, state, and local government entities.

The OMB defines acore-based statistical area (commonly referred to as aCBSA) as thecounty or counties (orcounty-equivalents) surrounding at least one densely-settled core of at least 10,000 population,^[2] "plus adjacent counties having a high degree of social and economic integration with the core as measured through commuting ties with the counties containing the core".^[2] The OMB further divides core-based statistical areas based on population intometropolitan statistical areas (MSAs) for those with at least 50,000 andmicropolitan statistical areas (μSAs) for those with 10,000 to 49,999 people.^[2]

The OMB defines acombined statistical area (CSA) as two or more adjacentcore-based statistical areas where the employment interchange rate (% commuting from A to B plus % commuting from B to A) is at least 15%.^[2] Theprimary statistical areas (PSAs) include allcombined statistical areas and anycore-based statistical area that is not a constituent of a combined statistical area.

The following table provides the in-state population ranking of each CBSA along with its rate of population change over time.

The following table provides the in-state population ranking of each CSA along with its rate of population change over time.

• Geography of Maine
  • Demographics of Maine

• Office of Management and Budget
• United States Census Bureau

45°22′10″N69°14′34″W / 45.3695°N 69.2428°W /45.3695; -69.2428 (State of Maine)

• Demographics of Maine
• Metropolitan areas of Maine
• United States statistical areas
• Maine geography-related lists

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• Pages using gadget WikiMiniAtlas
• Coordinates not on Wikidata