Jefferson County Population 2018

Jefferson County's estimated population is 574,613 with a growth rate of 0.66% in the past year according to the most recent United States census data. Jefferson County is the 4th largest county in Colorado.

Year Population Growth Growth Rate
2017574,6133,7740.66%
2016570,8396,4741.15%
2015564,3655,8461.05%
2014558,5196,7101.22%
2013551,8095,4761.00%
2012546,3335,9041.09%
2011540,4294,6920.88%
2010535,73797,30722.19%
1990438,43066,67717.94%
1980371,753138,72259.53%
1970233,031105,51182.74%
1960127,52071,833128.99%
195055,68724,96281.24%
194030,7258,91540.88%
193021,8107,41051.46%
192014,4001691.19%
191014,2314,92552.92%
19009,30685610.13%
18908,4501,64624.19%
18806,8044,414184.69%
18702,3900.00%

Jefferson County Population Growth

Population Data via

Jefferson County Race Data

Race Population Percentage
White521,16690.70%
Asian16,2322.82%
Two or More Races13,3122.32%
Black or African American7,0041.22%
American Indian and Alaska Native6,7551.18%
Native Hawaiian and Other Pacific Islander6740.12%

Jefferson County Population Pyramid

0k5k10k15k20k Male Population0k5k10k15k20k 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