Iowa
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Iowa Population News Articles
Population Density
Historic & Projected Growth
Population by County
POPULATION DENSITY
People per square mile, 2010: 54.5
People per square mile, 2020: 57.1
HISTORIC & PROJECTED GROWTH 1790 TO 2040
Year |
Population |
1790 |
0 |
1800 |
0 |
1810 |
0 |
1820 |
0 |
1830 |
0 |
1840 |
43,112 |
1850 |
192,914 |
1860 |
674,913 |
1870 |
1,194,020 |
1880 |
1,624,615 |
1890 |
1,912,297 |
1900 |
2,231,853 |
1910 |
2,224,771 |
1920 |
2,404,021 |
1930 |
2,470,939 |
1940 |
2,538,268 |
1950 |
2,621,073 |
1960 |
2,757,537 |
1970 |
2,825,368 |
1980 |
2,913,808 |
1990 |
2,776,755 |
2000 |
2,926,324 |
2010 |
3,046,355 |
2020 |
3,190,369 |
2030 |
3,317,412 |
2040 |
3,392,783 |
SOURCE: U.S. Bureau of the Census & Weldon Cooper Center, Demographics Research Group
(The Census Bureau and Weldon Cooper Center have not yet provided updated State projections to reflect 2020 census numbers.)
Population by County
Population By County |
Census 2020 Population |
Census 2010 Population |
Change from 2010 |
Percent Change |
IOWA |
3,190,369 |
3,046,355 |
-144,014 |
-4.51% |
Adair County |
7,496 |
7,682 |
-186 |
-2.42% |
Adams County |
3,704 |
4,029 |
-325 |
-8.07% |
Allamakee County |
14,061 |
14,330 |
-269 |
-1.88% |
Appanoose County |
12,317 |
12,887 |
-570 |
-4.42% |
Audubon County |
5,674 |
6,119 |
-445 |
-7.27% |
Benton County |
25,575 |
26,076 |
-501 |
-1.92% |
Black Hawk County |
131,144 |
131,090 |
54 |
0.04% |
Boone County |
26,715 |
26,306 |
409 |
1.55% |
Bremer County |
24,988 |
24,276 |
712 |
2.93% |
Buchanan County |
20,565 |
20,958 |
-393 |
-1.88% |
Buena Vista County |
20,823 |
20,260 |
563 |
2.78% |
Butler County |
14,334 |
14,867 |
-533 |
-3.59% |
Calhoun County |
9,927 |
9,670 |
257 |
2.66% |
Carroll County |
20,760 |
20,816 |
-56 |
-0.27% |
Cass County |
13,127 |
13,956 |
-829 |
-5.94% |
Cedar County |
18,505 |
18,499 |
6 |
0.03% |
Cerro Gordo County |
43,127 |
44,151 |
-1,024 |
-2.32% |
Cherokee County |
11,658 |
12,072 |
-414 |
-3.43% |
Chickasaw County |
12,012 |
12,439 |
-427 |
-3.43% |
Clarke County |
9,748 |
9,286 |
462 |
4.98% |
Clay County |
16,384 |
16,667 |
-283 |
-1.70% |
Clayton County |
17,043 |
18,129 |
-1,086 |
-5.99% |
Clinton County |
46,460 |
49,116 |
-2,656 |
-5.41% |
Crawford County |
16,525 |
17,096 |
-571 |
-3.34% |
Dallas County |
99,678 |
66,135 |
33,543 |
50.72% |
Davis County |
9,110 |
8,753 |
357 |
4.08% |
Decatur County |
7,645 |
8,457 |
-812 |
-9.60% |
Delaware County |
17,488 |
17,764 |
-276 |
-1.55% |
Des Moines County |
38,910 |
40,325 |
-1,415 |
-3.51% |
Dickinson County |
17,703 |
16,667 |
1,036 |
6.22% |
Dubuque County |
99,266 |
93,653 |
5,613 |
5.99% |
Emmet County |
9,388 |
10,302 |
-914 |
-8.87% |
Fayette County |
19,509 |
20,880 |
-1,371 |
-6.57% |
Floyd County |
15,627 |
16,303 |
-676 |
-4.15% |
Franklin County |
10,019 |
10,680 |
-661 |
-6.19% |
Fremont County |
6,605 |
7,441 |
-836 |
-11.24% |
Greene County |
8,771 |
9,336 |
-565 |
-6.05% |
Grundy County |
12,329 |
12,453 |
-124 |
-1.00% |
Guthrie County |
10,623 |
10,954 |
-331 |
-3.02% |
Hamilton County |
15,039 |
15,673 |
-634 |
-4.05% |
Hancock County |
10,795 |
11,341 |
-546 |
-4.81% |
Hardin County |
16,878 |
17,534 |
-656 |
-3.74% |
Harrison County |
14,582 |
14,928 |
-346 |
-2.32% |
Henry County |
20,482 |
20,145 |
337 |
1.67% |
Howard County |
9,469 |
9,566 |
-97 |
-1.01% |
Humboldt County |
9,597 |
9,815 |
-218 |
-2.22% |
Ida County |
7,005 |
7,089 |
-84 |
-1.18% |
Iowa County |
16,662 |
16,355 |
307 |
1.88% |
Jackson County |
19,485 |
19,848 |
-363 |
-1.83% |
Jasper County |
37,813 |
36,842 |
971 |
2.64% |
Jefferson County |
15,663 |
16,843 |
-1,180 |
-7.01% |
Johnson County |
152,854 |
130,882 |
21,972 |
16.79% |
Jones County |
20,646 |
20,638 |
8 |
0.04% |
Keokuk County |
10,033 |
10,511 |
-478 |
-4.55% |
Kossuth County |
14,828 |
15,543 |
-715 |
-4.60% |
Lee County |
33,555 |
35,862 |
-2,307 |
-6.43% |
Linn County |
230,299 |
211,226 |
19,073 |
9.03% |
Louisa County |
10,837 |
11,387 |
-550 |
-4.83% |
Lucas County |
8,634 |
8,898 |
-264 |
-2.97% |
Lyon County |
11,934 |
11,581 |
353 |
3.05% |
Madison County |
16,548 |
15,679 |
869 |
5.54% |
Mahaska County |
22,190 |
22,381 |
-191 |
-0.85% |
Marion County |
33,414 |
33,309 |
105 |
0.32% |
Marshall County |
40,105 |
40,648 |
-543 |
-1.34% |
Mills County |
14,484 |
15,059 |
-575 |
-3.82% |
Mitchell County |
10,565 |
10,776 |
-211 |
-1.96% |
Monona County |
8,751 |
9,243 |
-492 |
-5.32% |
Monroe County |
7,577 |
7,970 |
-393 |
-4.93% |
Montgomery County |
10,330 |
10,740 |
-410 |
-3.82% |
Muscatine County |
43,235 |
42,745 |
490 |
1.15% |
O’Brien County |
14,182 |
14,398 |
-216 |
-1.50% |
Osceola County |
6,192 |
6,462 |
-270 |
-4.18% |
Page County |
15,211 |
15,932 |
-721 |
-4.53% |
Palo Alto County |
8,996 |
9,421 |
-425 |
-4.51% |
Plymouth County |
25,698 |
24,986 |
712 |
2.85% |
Pocahontas County |
7,078 |
7,310 |
-232 |
-3.17% |
Polk County |
492,401 |
430,640 |
61,761 |
14.34% |
Pottawattamie County |
93,667 |
93,158 |
509 |
0.55% |
Poweshiek County |
18,662 |
18,914 |
-252 |
-1.33% |
Ringgold County |
4,663 |
5,131 |
-468 |
-9.12% |
Sac County |
9,814 |
10,350 |
-536 |
-5.18% |
Scott County |
174,669 |
165,224 |
9,445 |
5.72% |
Shelby County |
11,746 |
12,167 |
-421 |
-3.46% |
Sioux County |
35,872 |
33,704 |
2,168 |
6.43% |
Story County |
98,537 |
89,542 |
8,995 |
10.05% |
Tama County |
17,135 |
17,767 |
-632 |
-3.56% |
Taylor County |
5,896 |
6,317 |
-421 |
-6.66% |
Union County |
12,138 |
12,534 |
-396 |
-3.16% |
Van Buren County |
7,203 |
7,570 |
-367 |
-4.85% |
Wapello County |
35,437 |
35,625 |
-188 |
-0.53% |
Warren County |
52,403 |
46,225 |
6,178 |
13.37% |
Washington County |
22,565 |
21,704 |
861 |
3.97% |
Wayne County |
6,497 |
6,403 |
94 |
1.47% |
Webster County |
36,999 |
38,013 |
-1,014 |
-2.67% |
Winnebago County |
10,679 |
10,866 |
-187 |
-1.72% |
Winneshiek County |
20,070 |
21,056 |
-986 |
-4.68% |
Woodbury County |
105,941 |
102,172 |
3,769 |
3.69% |
Worth County |
7,443 |
7,598 |
-155 |
-2.04% |
Wright County |
12,943 |
13,229 |
-286 |
-2.16% |
SOURCE: U.S. Bureau of the Census
Iowa Population News Articles
Rubbertown residents voice concerns over Kentucky’s new hyperscale data center – Oct 21, 2025
Lexington nonprofit records a drop in the unhoused population, but shelter needs still remain – Oct 9, 2025
Ky rural economy report finds population growth occurring – Oct 7, 2025
Kentucky trails nation on new climate and health scorecard – Sep 26, 2025
Iowa’s Latino Population in Iowa – June 20, 2025
Lawn watering ban still in place for more than 600,000 central Iowans; water usage drops by 30% – June 17, 2025
Near-record nitrate levels in Des Moines, Iowa-area rivers threaten drinking water – June 12, 2025
Big city amenities combined with small-town-style perks help spur Des Moines metro’s growth – June 12, 2025
DSM faces declining air quality while most U.S. cities improve – May 27, 2025
10 Iowa Counties at Most Risk of Tornado Damage in 2025 – May 27, 2025
Counties in Iowa where landslides pose the greatest threat – Dec 2, 2024
Iowa immigrant advocacy group urges undocumented people to prepare for 2nd Trump term – Dec 2, 2024
Iowa City residents, DNR, EPA, work together to search for sources of pollution – Nov 19, 2024
EPA Finds Dangerous Nitrate Contamination In IA Urban Drinking Water Supplies – Nov 14, 2024
Ruling in northeast Iowa case could impact state groundwater usage – Nov 14, 2024
EPA adds 7 segments to Iowa’s 2024 impaired water list – Nov 13, 2024
Tiffin plans major expansion with $10 million rec center amid population boom – Sept 18, 2024
Iowa releases ‘Condition of the State’ report on clean energy goals – Sept 12, 2024
Iowa has second-in-the-nation cancer rate; Residents doubt cause – Sept 4, 2024
Iowa joins 15 other GOP-led states in new immigration lawsuit – Aug 23, 2024
Changing climate contributes to record Iowa tornado season – July 1, 2024
Factory Farm Waste Intensifies Health Risks In NW Iowa Flooding – June 25, 2024
Data Shows Iowa Air Quality Monitoring is Insufficient to Protect Public Health – June 18, 2024
Advocates, law enforcement react to temporary injunction on Iowa migrant reentry law – June 18, 2024
Iowa readies a $200 million bond to control agricultural runoff and improve water quality – June 3, 2024
An Iowa farm county seeks answers amid cancer rates 50% higher than national average – May 7, 2024
Iowa officials describe border security efforts during recent $2 million deployment – October 25, 2023
The 5 Fastest Growing Towns in Iowa Everyone Is Talking About – October 23, 2023
What does Iowa water quality look like after 10 years with the Nutrient Reduction Strategy? – October 18, 2023
Discover the Largest Cities in Iowa (By Population, Total Area, and Economic Impact) – October 14, 2023
Iowa’s Latino youth will help shape the future of an aging state – October 3, 2023
Iowa Has A Jaw Dropping Number Of Registered Cars On The Road – July 12, 2023
DROUGHT CONDITIONS CONTINUE TO LINGER IN SOUTHEAST IOWA – July 7, 2023
Iowa electric vehicle registrations up nearly 30%, but charging stations lag – July 7, 2023
Iowa climate action leaders optimistic in face of new records – July 5, 2023
Iowa expert shares lessons about hog production and water pollution – June 30, 2023
Iowa Factory Farms Are Supercharging the Climate Crisis – December 13, 2022
Iowa Watershed Watchers Want Action on Climate Change – December 11, 2022
Is Cedar River segment impaired for nitrate? Experts disagree – December 7, 2022
Rapid growth in Tiffin spurs exciting new projects in the corridor – December 2, 2022
‘Major source’ of air pollution operated without permits for decades, DNR says – November 22, 2022
Swimming not recommended at these 11 Iowa beaches due to high bacteria levels, DNR says – July 17, 2022
Homelessness Symposium aims to end homeless crisis in Iowa – July 13, 2022
Scientists say Iowa’s future climate could lead to more amoeba cases – July 12, 2022
Detailed Dive Into Iowa Drought and Crop Conditions – July 8, 2022
Iowa court reverses precedent on Iowa pig farm lawsuits – June 30, 2022
The Trickle-Down Effect of Agriculture in Iowa – March 16, 2022
One rural Iowa town wants to grow. So, it’s building its first child care center. – March 15, 2022
Another push to update Iowa’s 44-year-old ‘Bottle Bill’ – March 14, 2022
Concern on the rise over carbon capture pipelines in North Iowa – March 10, 2022
Iowa impaired waters list grows in 2022 – February 21, 2022