Washington County Population 2018

Washington County's estimated population is 22,281 with a growth rate of 0.78% in the past year according to the most recent United States census data. Washington County is the 27th largest county in Iowa.

Year Population Growth Growth Rate
201722,2811720.78%
201622,109-19-0.09%
201522,1281110.50%
201422,017760.35%
201321,941380.17%
201221,903840.38%
201121,8191290.59%
201021,6902,07810.60%
199019,612-529-2.63%
198020,1411,1746.19%
197018,967-439-2.26%
196019,406-151-0.77%
195019,557-498-2.48%
194020,0552331.18%
193019,822-599-2.93%
192020,4214962.49%
191019,925-793-3.83%
190020,7182,25012.18%
189018,468-1,906-9.36%
188020,3741,4227.50%
187018,9524,71733.14%
186014,2359,278187.17%
18504,9573,363210.98%
18401,5940.00%

Washington County Population Growth

Population Data via

Washington County Race Data

Race Population Percentage
White21,59296.91%
Two or More Races2631.18%
Black or African American2040.92%
Asian1110.50%
American Indian and Alaska Native650.29%
Native Hawaiian and Other Pacific Islander160.07%

Washington County Population Pyramid

0k0k0k1k1k Male Population0k0k0k1k1k 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