Statistical area (United States)

The United States federal government defines and delineates the nation's metropolitan areas for statistical purposes, using a set of standard statistical area definitions. As of 2023,^[update] the U.S. Office of Management and Budget (OMB) defined and delineated 393 metropolitan statistical areas (MSAs) and 542 micropolitan statistical areas (μSAs) in the United States and Puerto Rico.^[1] Many of these 935 MSAs and μSAs are, in turn, components of larger combined statistical areas (CSAs) consisting of adjacent MSAs and μSAs that are linked by commuting ties; as of 2023,^[update] 582 metropolitan and micropolitan areas are components of the 184 defined CSAs. A collective term for MSAs, μSAs, and CSAs is primary statistical areas (PSAs), though that term is not used by OMB.

Metropolitan and micropolitan statistical areas are defined as consisting of one or more adjacent counties or county equivalents with at least one urban core area meeting relevant population thresholds, plus adjacent territory that has a high degree of social and economic integration with the core, as measured by commuting ties. A metropolitan statistical area has at least one core with a population of at least 50,000. In a micropolitan statistical area, the largest core has a population of at least 10,000 but less than 50,000.

Maps

Types and distribution

The sortable table below shows the number of combined, metropolitan and micropolitan statistical areas in each of the U.S. states, the District of Columbia, and Puerto Rico as of 2023. For each jurisdiction, it lists:

Total number of delineated areas wholly or partially in the named jurisdiction^[1]
The number of CSAs wholly or partially in the jurisdiction^[1]
The number of core-based statistical areas (i.e., MSAs and μSAs) wholly or partially in the jurisdiction^[1]
The number of MSAs wholly or partially in the jurisdiction^[1]
The number of μSAs wholly or partially in the jurisdiction^[1]

Number of metropolitan and micropolitan areas in the United States and Puerto Rico^[a]
Jurisdiction	Delineated areas	CSAs	Core-based areas	MSAs	μSAs
Alabama^[2]	34	9	25	12	13
Alaska	4	0	4	2	2
Arizona	13	2	11	7	4
Arkansas^[2]	25	4	21	7	14
California	42	7	35	25	10
Colorado	20	3	17	7	10
Connecticut^[2]	9	2	7	5	2
Delaware^[2]	4	1	3	2	1
Florida^[2]	35	7	28	22	6
Georgia^[2]	46	7	39	15	24
Hawaiʻi	4	0	4	2	2
Idaho^[2]	22	5	17	7	10
Illinois^[2]	47	14	33	12	21
Indiana^[2]	50	10	40	15	25
Iowa^[2]	31	7	24	9	15
Kansas^[2]	25	3	22	7	15
Kentucky^[2]	32	8	24	9	15
Louisiana^[2]	25	6	19	10	9
Maine	5	1	4	3	1
Maryland^[2]	13	3	10	6	4
Massachusetts^[2]	12	2	10	7	3
Michigan^[2]	43	8	35	16	19
Minnesota^[2]	34	6	28	9	19
Mississippi^[2]	27	6	21	4	17
Missouri^[2]	31	6	25	7	18
Montana	7	0	7	5	2
Nebraska^[2]	16	3	13	4	9
Nevada	10	2	8	3	5
New Hampshire^[2]	8	2	6	2	4
New Jersey^[2]	9	3	6	6	0
New Mexico	19	2	17	4	13
New York^[2]	34	7	27	13	14
North Carolina^[2]	48	9	39	15	24
North Dakota^[2]	9	1	8	4	4
Ohio^[2]	55	11	44	15	29
Oklahoma^[2]	28	6	22	5	17
Oregon^[2]	24	4	20	8	12
Pennsylvania^[2]	48	12	36	20	16
Rhode Island^[2]	2	1	1	1	0
South Carolina^[2]	20	4	16	10	6
South Dakota^[2]	14	2	12	3	9
Tennessee^[2]	34	7	27	10	17
Texas^[2]	80	13	67	26	41
Utah^[2]	12	1	11	5	6
Vermont^[2]	8	2	6	1	5
Virginia^[2]	19	4	15	11	4
Washington^[2]	29	6	23	13	10
West Virginia^[2]	20	5	15	10	5
Wisconsin^[2]	40	11	29	15	14
Wyoming^[2]	10	0	10	2	8
District of Columbia^[3]	2	1	1	1	0
United States	1106	181	925	387	538
Puerto Rico	13	3	10	6	4
United States & Puerto Rico	1119	184	935	393	542