Jefferson County Population 2018

Jefferson County's estimated population is 11,891 with a growth rate of 1.03% in the past year according to the most recent United States census data. Jefferson County is the 15th largest county in Montana.

Year Population Growth Growth Rate
201711,8911211.03%
201611,7702171.88%
201511,553750.65%
201411,478430.38%
201311,4351181.04%
201211,317-54-0.47%
201111,371-35-0.31%
201011,4063,46743.67%
19907,93991012.95%
19807,0291,79134.19%
19705,23894121.90%
19604,2972837.05%
19504,014-650-13.94%
19404,66453112.85%
19304,133-1,070-20.57%
19205,203-398-7.11%
19105,6012715.08%
19005,330-696-11.55%
18906,0263,562144.56%
18802,46493360.94%
18701,5310.00%

Jefferson County Population Growth

Population Data via

Jefferson County Race Data

Race Population Percentage
White11,09393.29%
Two or More Races2682.25%
American Indian and Alaska Native2061.73%
Asian560.47%
Black or African American460.39%
Native Hawaiian and Other Pacific Islander20.02%

Jefferson 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