Jefferson County Population 2018

Jefferson County's estimated population is 18,422 with a growth rate of 1.38% in the past year according to the most recent United States census data. Jefferson County is the 38th largest county in Iowa.

Year Population Growth Growth Rate
201718,4222501.38%
201618,1722451.37%
201517,9272341.32%
201417,6931841.05%
201317,5092941.71%
201217,2152011.18%
201117,0141851.10%
201016,8295193.18%
199016,310-6-0.04%
198016,3165423.44%
197015,774-44-0.28%
196015,8181220.78%
195015,696-66-0.42%
194015,762-479-2.95%
193016,241-199-1.21%
192016,4404893.07%
191015,951-1,486-8.52%
190017,4372,25314.84%
189015,184-2,285-13.08%
188017,469-370-2.07%
187017,8392,80118.63%
186015,0385,13451.84%
18509,9047,131257.16%
18402,7730.00%

Jefferson County Population Growth

Population Data via

Jefferson County Race Data

Race Population Percentage
White14,94081.10%
Asian2,23112.11%
Black or African American3471.88%
Two or More Races2751.49%
American Indian and Alaska Native480.26%
Native Hawaiian and Other Pacific Islander120.07%

Jefferson County Population Pyramid

0k1k1k2k Male Population0k1k1k2k 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