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.
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
|
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
|
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
|
- ^ 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.