O'Brien County Population 2017

O'Brien County's estimated population is 14,020 with a growth rate of 0.22% in the past year according to the most recent United States census data. O'Brien County is the 56th largest county in Iowa.

Year Population Growth Growth Rate
201614,020310.22%
201513,989-73-0.52%
201414,062190.14%
201314,043-118-0.83%
201214,161-45-0.32%
201114,206-192-1.33%
201014,398-1,046-6.77%
199015,444-1,528-9.00%
198016,972-550-3.14%
197017,522-1,318-7.00%
196018,840-130-0.69%
195018,970-323-1.67%
194019,2938844.80%
193018,409-642-3.37%
192019,0511,78910.36%
191017,2622771.63%
190016,9853,92530.05%
189013,0608,905214.32%
18804,1553,440481.12%
18707157078837.50%
186080.00%

O'Brien County Population Growth

Population Data via

O'Brien County Race Data

Race Population Percentage
White13,55396.67%
Two or More Races1310.93%
Asian1270.91%
Black or African American1260.90%
American Indian and Alaska Native460.33%
Native Hawaiian and Other Pacific Islander60.04%

O'Brien County Population Pyramid

0k0k0k0k0k1k1kO'Brien County Male Population0k0k0k0k0k1k1kO'Brien County Female Population
Data Sources
  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990