O'Brien

County in Iowa

County

The population development of O'Brien.

Name	Status	Population Census 1990-04-01	Population Census 2000-04-01	Population Census 2010-04-01	Population Census 2020-04-01	Population Estimate 2024-07-01
O'Brien	County	15,444	15,102	14,398	14,180	14,260	→
Iowa	State	2,776,755	2,926,324	3,046,355	3,190,546	3,241,488

Contents: Incorporated Places

The population development of the incorporated places in O'Brien.

The Details icon links to further information about a selected place including its population structure (gender, age groups, age distribution, urbanization, »race«, ethnicity).

Name	Status	County	Population Census 1990-04-01	Population Census 2000-04-01	Population Census 2010-04-01	Population Census 2020-04-01	Population Estimate 2024-07-01
Archer	City	O'Brien	145	126	131	116	116	→
Calumet	City	O'Brien	160	182	170	146	144	→
Hartley	City	O'Brien	1,653	1,738	1,672	1,604	1,584	→
Paullina	City	O'Brien	1,149	1,092	1,052	979	979	→
Primghar	City	O'Brien	955	891	909	905	893	→
Sanborn	City	O'Brien	1,345	1,349	1,404	1,392	1,463	→
Sheldon	City	O'Brien / Sioux	4,937	5,019	5,196	5,514	5,584	→
Sutherland	City	O'Brien	729	707	649	630	628	→

Source: U.S. Census Bureau.

Explanation: Latest available rebased population figures are used. In case of significant changes, they were recalculated by using census block data.

Further information about the population structure:

Gender (C 2020)
Males	7,143
Females	7,039

Age Groups (C 2020)
0-17 years	3,298
18-64 years	7,750
65+ years	3,134

Age Distribution (C 2020)
80+ years	1,059
70-79 years	1,136
60-69 years	2,010
50-59 years	1,698
40-49 years	1,491
30-39 years	1,679
20-29 years	1,506
10-19 years	1,865
0-9 years	1,738

Urbanization (C 2020)
Rural	9,051
Urban	5,131

»Race« (C 2020)
White	12,825
Black/African American	161
Indigenous	80
Asian	80
Pacific Islander	11
Some other	376
2 or more	649

Ethnicity (C 2020)
Hispanic or Latino	985
Other	13,197