Jefferson County

County population

Year	Population
1980.	7040
1990.	7939
2000.	10049
2010.	11406

Details Jefferson County Jefferson County

jeffco.mt.gov

Montana

Jefferson County

County

30043

County seat is in Boulder
Founded in 1864
Area: 1,657 square miles
County board has 3 members
FIPS code: 30043


Zipcodes in Jefferson County: 59631, 59632, 59634, 59721, 59638, 59759

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