Iowa statistical areas

The U.S. State of Iowa currently has 31 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated seven combined statistical areas, nine metropolitan statistical areas, and 15 micropolitan statistical areas in Iowa.[1]. As of 2023, the largest of these is the Des Moines-West Des Moines-Ames, IA CSA, comprising the area around Iowa's capital and largest city, Des Moines.

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 31 United States statistical areas and 99 counties of the State of Iowa[a]
Combined statistical area[1] 2023 population (est.)[3] Core-based statistical area[1] 2023 population (est.)[3] County 2023 population (est.)[3]
Des Moines-West Des Moines-Ames, IA CSA 917,964 Des Moines-West Des Moines, IA MSA 737,164 Polk County, Iowa 505,255
Dallas County, Iowa 111,092
Warren County, Iowa 55,205
Jasper County, Iowa 37,919
Madison County, Iowa 16,971
Guthrie County, Iowa 10,722
Ames, IA MSA 125,156 Story County, Iowa 98,566
Boone County, Iowa 26,590
Pella, IA μSA 33,770 Marion County, Iowa 33,770
Oskaloosa, IA μSA 21,874 Mahaska County, Iowa 21,874
Cedar Rapids-Iowa City, IA CSA 455,756 Cedar Rapids, IA MSA 275,668 Linn County, Iowa 228,972
Benton County, Iowa 25,796
Jones County, Iowa 20,900
Iowa City, IA MSA 180,088 Johnson County, Iowa 157,528
Washington County, Iowa 22,560
Davenport-Moline, IA-IL CSA 467,817
262,646 		Davenport-Moline-Rock Island, IA-IL MSA 379,441
174,270 		Scott County, Iowa 174,270
Rock Island County, Illinois 141,236
Henry County, Illinois 48,448
Mercer County, Illinois 15,487
Clinton, IA μSA 46,158 Clinton County, Iowa 46,158
Muscatine, IA μSA 42,218 Muscatine County, Iowa 42,218
none Waterloo-Cedar Falls, IA MSA 168,162 Black Hawk County, Iowa 130,471
Bremer County, Iowa 25,307
Grundy County, Iowa 12,384
Sioux City-Le Mars, IA-NE-SD CSA 170,124
131,673 		Sioux City, IA-NE-SD MSA 144,402
105,951 		Woodbury County, Iowa 105,951
Dakota County, Nebraska 21,268
Union County, South Dakota 17,183
Le Mars, IA μSA 25,722 Plymouth County, Iowa 25,722
Omaha-Fremont, NE-IA CSA 1,021,156
122,482 		Omaha, NE-IA MSA 983,969
122,482 		Douglas County, Nebraska 589,540
Sarpy County, Nebraska 199,886
Pottawattamie County, Iowa 93,179
Cass County, Nebraska 27,446
Saunders County, Nebraska 23,463
Washington County, Nebraska 21,152
Harrison County, Iowa 14,670
Mills County, Iowa 14,633
Fremont, NE μSA 37,187 Dodge County, Nebraska 37,187
none Dubuque, IA MSA 98,887 Dubuque County, Iowa 98,887
Burlington-Fort Madison, IA-IL CSA 76,906
70,818 		Burlington, IA-IL μSA 44,341
38,253 		Des Moines County, Iowa 38,253
Henderson County, Illinois 6,088
Fort Madison, IA μSA 32,565 Lee County, Iowa 32,565
none Mason City, IA μSA 49,703 Cerro Gordo County, Iowa 42,406
Worth County, Iowa 7,297
Marshalltown, IA μSA 40,014 Marshall County, Iowa 40,014
Fort Dodge, IA μSA 36,485 Webster County, Iowa 36,485
Ottumwa, IA μSA 35,166 Wapello County, Iowa 35,166
Spencer-Spirit Lake, IA CSA 34,567 Spirit Lake, IA μSA 18,056 Dickinson County, Iowa 18,056
Spencer, IA μSA 16,511 Clay County, Iowa 16,511
none Storm Lake, IA μSA 20,567 Buena Vista County, Iowa 20,567
Carroll, IA μSA 20,522 Carroll County, Iowa 20,522
none Sioux County, Iowa 36,246
Buchanan County, Iowa 20,691
Winneshiek County, Iowa 19,815
Henry County, Iowa 19,547
Jackson County, Iowa 19,342
Fayette County, Iowa 19,210
Poweshiek County, Iowa 18,453
Cedar County, Iowa 18,302
Delaware County, Iowa 17,600
Clayton County, Iowa 16,969
Tama County, Iowa 16,833
Hardin County, Iowa 16,463
Iowa County, Iowa 16,381
Crawford County, Iowa 16,013
Jefferson County, Iowa 15,440
Floyd County, Iowa 15,326
Page County, Iowa 15,014
Hamilton County, Iowa 14,729
Kossuth County, Iowa 14,396
Butler County, Iowa 14,172
Allamakee County, Iowa 14,074
O'Brien County, Iowa 14,012
Cass County, Iowa 13,130
Wright County, Iowa 12,656
Lyon County, Iowa 12,324
Appanoose County, Iowa 12,119
Union County, Iowa 11,906
Shelby County, Iowa 11,806
Chickasaw County, Iowa 11,658
Cherokee County, Iowa 11,605
Hancock County, Iowa 10,615
Winnebago County, Iowa 10,571
Mitchell County, Iowa 10,518
Louisa County, Iowa 10,513
Montgomery County, Iowa 10,139
Keokuk County, Iowa 9,914
Franklin County, Iowa 9,875
Calhoun County, Iowa 9,763
Sac County, Iowa 9,686
Clarke County, Iowa 9,588
Humboldt County, Iowa 9,500
Howard County, Iowa 9,376
Emmet County, Iowa 9,229
Davis County, Iowa 9,169
Palo Alto County, Iowa 8,810
Lucas County, Iowa 8,747
Greene County, Iowa 8,584
Monona County, Iowa 8,493
Decatur County, Iowa 7,665
Monroe County, Iowa 7,504
Adair County, Iowa 7,389
Van Buren County, Iowa 7,266
Pocahontas County, Iowa 6,976
Ida County, Iowa 6,833
Wayne County, Iowa 6,557
Fremont County, Iowa 6,458
Osceola County, Iowa 5,978
Taylor County, Iowa 5,924
Audubon County, Iowa 5,534
Ringgold County, Iowa 4,642
Adams County, Iowa 3,544
State of Iowa 3,207,004

Primary statistical areas

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. Of the 31 statistical areas of Iowa, 15 are PSAs comprising seven combined statistical areas, two metropolitan statistical areas and six micropolitan statistical areas.

The 15 primary statistical areas of the State of Iowa[b]
2020 rank Primary statistical area[1] Population
2023 estimate[3] Change 2020 Census[4] Change 2010 Census[5]
1 Des Moines-West Des Moines-Ames, IA CSA 917,964 +3.10% 890,322 +14.44% 778,013
2 Cedar Rapids-Iowa City, IA CSA 455,756 +0.84% 451,939 +10.09% 410,526
3 Davenport-Moline, IA-IL CSA (IA only) 262,646 −0.65% 264,364 +2.83% 257,085
4 Waterloo-Cedar Falls, IA MSA 168,162 −0.18% 168,461 +0.38% 167,819
5 Sioux City-Le Mars, IA-NE-SD CSA (IA only) 131,673 +0.03% 131,639 +3.52% 127,158
6 Omaha-Fremont, NE-IA CSA (IA only) 122,482 −0.20% 122,733 −0.33% 123,145
7 Dubuque, IA MSA 98,887 −0.38% 99,266 +5.99% 93,653
8 Burlington-Fort Madison, IA-IL CSA (IA only) 70,818 −2.27% 72,465 −4.89% 76,187
9 Mason City, IA μSA 49,703 −1.71% 50,570 −2.28% 51,749
10 Marshall, IA μSA 40,014 −0.23% 40,105 −1.34% 40,648
11 Fort Dodge, IA μSA 36,485 −1.39% 36,999 −2.67% 38,013
12 Ottumwa, IA μSA 35,166 −0.76% 35,437 −0.53% 35,625
13 Spencer-Spirit Lake, IA CSA 34,567 +1.41% 34,087 +2.26% 33,334
14 Storm Lake, IA μSA 20,567 −1.23% 20,823 +2.78% 20,260
15 Carroll, IA μSA 20,522 −1.15% 20,760 −0.27% 20,816
Davenport-Moline, IA-IL CSA 467,817 −1.31% 474,019 +0.74% 470,527
Sioux City-Le Mars, IA-NE-SD CSA 170,124 +0.05% 170,032 +4.59% 162,563
Omaha-Fremont, NE-IA CSA 1,021,156 +1.63% 1,004,771 +11.39% 902,041
Burlington-Fort Madison, IA-IL CSA 76,906 −2.47% 78,852 −5.59% 83,518

See also

  • iconGeography portal
  • flagUnited States portal
  • flagIowa portal

Notes

  1. ^ An out-of-state area and its population are displayed in green. An area that extends into more than one state is displayed in teal. A teal population number over a black population number show the total population versus the in-state population.
  2. ^ For PSAs comprising populations from multiple states, they are listed twice to show both their intrastate population within that PSA as well as the PSA's total population. Only the intrastate population is ranked.

References

  1. ^ a b c d Revised Delineations of Metropolitan Statistical Areas, Micropolitan Statistical Areas, and Combined Statistical Areas, and Guidance on Uses of the Delineations of These Areas (July 21, 2023). "0MB BULLETIN NO. 23-01" (PDF). Office of Management and Budget. Retrieved October 23, 2023.{{cite web}}: CS1 maint: multiple names: authors list (link)
  2. ^ a b c d e "2020 Standards for Delineating Core Based Statistical Areas". Office of Management and Budget. July 16, 2021. Retrieved December 13, 2021.
  3. ^ a b c d "County Population Totals and Components of Change: 2020-2023". United States Census Bureau, Population Division. March 2023. Retrieved May 21, 2024.
  4. ^ "PROFILE OF GENERAL POPULATION AND HOUSING CHARACTERISTICS". U.S. Census Bureau. 2020. Retrieved May 21, 2024.
  5. ^ "Annual Estimates of the Resident Population for Counties: April 1, 2010 to July 1, 2019". U.S. Census Bureau. 2019. Retrieved May 21, 2024.

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