O'Brien County Population 2018

O'Brien County's estimated population is 13,801 with a growth rate of -0.86% in the past year according to the most recent United States census data. O'Brien County is the 57th largest county in Iowa.

Year Population Growth Growth Rate
201713,801-120-0.86%
201613,92120.01%
201513,919-117-0.83%
201414,036-8-0.06%
201314,044-110-0.78%
201214,154-64-0.45%
201114,218-190-1.32%
201014,408-1,036-6.71%
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
White13,55398.20%
Two or More Races1310.95%
Asian1270.92%
Black or African American1260.91%
American Indian and Alaska Native460.33%
Native Hawaiian and Other Pacific Islander60.04%

O'Brien County Population Pyramid

0k0k0k0k0k1k1k Male Population0k0k0k0k0k1k1k Female Population8580757065605550454035302520151050
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