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, 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, 582 metropolitan and micropolitan areas are components of the 184 defined CSAs.

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

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An enlargeable map of the 935 core-based statistical areas (MSAs and μSAs) of the 50 states, the District of Columbia, and Puerto Rico. The 393 MSAs are shown in medium green  . The 542 μSAs are shown in light green  .
 
An enlargeable map of the 184 combined statistical areas (CSAs) of the 50 states, the District of Columbia, and Puerto Rico, shown in shades of green. The metropolitan statistical areas (MSAs) outside CSAs are shown in medium tan. The micropolitan statistical areas (μSAs) outside CSAs are shown in light tan.

Types and distribution

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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:

  1. Total number of delineated areas wholly or partially in the named jurisdiction[1]
  2. The number of CSAs wholly or partially in the jurisdiction[1]
  3. The number of core-based statistical areas (i.e., MSAs and μSAs) wholly or partially in the jurisdiction[1]
  4. The number of MSAs wholly or partially in the jurisdiction[1]
  5. The number of μSAs wholly or partially in the jurisdiction[1]
Number of statistical areas in the United States and Puerto Rico[a]

Jurisdiction Delineated areas CSAs Core-based areas MSAs μSAs
Alabama[2] 35 9 26 13 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

See also

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Notes

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  1. ^ Because many metropolitan and micropolitan areas overlap jurisdictional boundaries, columns are not additive.

References

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  1. ^ a b c d e f "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" (PDF). United States Office of Management and Budget. July 21, 2023. Retrieved May 2, 2024.
  2. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am an ao This state shares one or more statistical areas with one or more other states.
  3. ^ The District of Columbia shares both its statistical areas with nearby states.
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