District of Columbia statistical areas

The United States District of Columbia (Washington, D.C.) is the primary city of two statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated the Washington-Arlington-Alexandria, DC-VA-MD-WV MSA and the more extensive Washington-Baltimore-Arlington, DC-MD-VA-WV-PA CSA.^[1]

Background

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

The OMB defines a core-based statistical area (commonly referred to as a CBSA) as the county or counties (or county-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 into metropolitan statistical areas (MSAs) for those with at least 50,000 and micropolitan statistical areas (μSAs) for those with 10,000 to 49,999 people.^[2]

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

Table

The two United States statistical areas of the District of Columbia^[a]
Combined statistical area^[1]	2023 population (est.)^[3]	Core-based statistical area^[1]	2023 population (est.)^[3]	County	2023 population (est.)^[3]	Metropolitan division^[1]	2023 population (est.)^[3]
Washington-Baltimore-Arlington, DC-MD-VA-WV-PA CSA	10,069,592 678,972 (DC)	Washington-Arlington-Alexandria, DC-VA-MD-WV MSA	6,304,975 678,972 (DC)	Fairfax County, Virginia	1,141,878	Arlington-Alexandria-Reston, VA-WV MD	3,154,735
				Prince William County, Virginia	489,640
				Loudoun County, Virginia	436,347
				Arlington County, Virginia	234,162
				Stafford County, Virginia	165,428
				City of Alexandria, Virginia	155,230
				Spotsylvania County, Virginia	149,588
				Fauquier County, Virginia	75,165
				Jefferson County, West Virginia	59,787
				Culpeper County, Virginia	54,973
				City of Manassas, Virginia	42,696
				Warren County, Virginia	41,843
				City of Fredericksburg, Virginia	28,928
				City of Fairfax, Virginia	25,144
				City of Manassas Park, Virginia	16,361
				Clarke County, Virginia	15,466
				City of Falls Church, Virginia	14,685
				Rappahannock County, Virginia	7,414
				Prince George's County, Maryland	947,430	Washington, DC-MD MD	1,798,375 678,972 (DC)
				District of Columbia	678,972
				Charles County, Maryland	171,973
				Montgomery County, Maryland	1,058,474	Frederick-Gaithersburg-Bethesda, MD MD	1,351,865
				Frederick County, Maryland	293,391	Frederick-Gaithersburg-Bethesda, MD MD	1,351,865
		Baltimore-Columbia-Towson, MD MSA	2,834,316	Baltimore County, Maryland	844,703	none
				Anne Arundel County, Maryland	594,582
				Baltimore City, Maryland	565,239
				Howard County, Maryland	336,001
				Harford County, Maryland	264,644
				Carroll County, Maryland	176,639
				Queen Anne's County, Maryland	52,508
		Hagerstown-Martinsburg, MD-WV MSA	305,902	Washington County, Maryland	155,813
				Berkeley County, West Virginia	132,440
				Morgan County, West Virginia	17,649
		Lexington Park, MD μSA	210,009	St. Mary's County, Maryland	115,281
		Lexington Park, MD μSA	210,009	Calvert County, Maryland	94,728
		Chambersburg, PA MSA	157,854	Franklin County, Pennsylvania	157,854
		Winchester, VA-WV MSA	147,260	Frederick County, Virginia	95,994
				City of Winchester, Virginia	27,617
				Hampshire County, West Virginia	23,649
		Lake of the Woods, VA μSA	38,574	Orange County, Virginia	38,574
		Easton, MD μSA	37,823	Talbot County, Maryland	37,823
		Cambridge, MD μSA	32,879	Dorchester County, Maryland	32,879
District of Columbia					678,972

Notes

^ An out-of-state area and its population are displayed in green. An area that extends into more than one state is displayed in purple. A purple population number over a black population number show the total population versus the in-state population. The state's abbreviation is also shown next to the in-state total.