Jefferson County , Montana

Jefferson County: County in Montana, United States

Jefferson County locator map
Location of Jefferson County on Montana map.

About

Jefferson County is a county located in the U.S. state of Montana. As of the 2010 census, the population was 11,406 and a population density of 3 people per km². After 10 years in 2020 county had an estimated population of 12,360 inhabitants. Its county seat is Boulder. The county was created 156 years ago in 1865.

Jeffersoncourthouse image
Jeffersoncourthouse
Jeffersoncourthouse image

Geography

Jefferson County is located at 46°8'55"N 112°5'37"W (46.1484900, -112.0937400). It has 3 neighbors: Madison County, Lewis and Clark County and Silver Bow County.

Jefferson County map

The largest city of Jefferson County is Clancy with a population of 1,661. . See all Jefferson County cities & populated places.

Weather

Jefferson County forecast: A chance of rain. Mostly cloudy, with a low around 37. more

Jefferson County Quick Facts

Population : 12,360 (2020)
Country : United States of America
State : Montana (United States)
Different from : Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson Parish, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County
Area : 4296 km2
Water as percent of area : 0.2%
Land as percent of area : 99.8%
Named for : Thomas Jefferson
Capital : Boulder
Establishment : February 02, 1865
Time Zone : America/Denver
Local time : 08:59:46 (25th October 2021)
Density : 3 Pop. per km² as of 2020
Population growth : 7.72% (2010-2020)
Weather : 37℉ Chance Light Rain 7-days weather

Jefferson County has 3 neighbours.

  • Boulder

Demographics

The population of Jefferson County increased by 7.72% in 10 years.

Year Population % Change Method
2010 11,406 - census
2011 11,375 -0.27% estimation process
2012 11,318 -0.5% estimation process
2013 11,455 1.2% estimation process
2014 11,502 0.41% estimation process
2015 11,572 0.6% estimation process
2016 11,779 1.76% estimation process
2017 11,921 1.19% estimation process
2018 12,094 1.43% estimation process
2019 12,221 1.04% estimation process
2020 12,360 1.12% estimation process

Comitatul Jefferson, Comte de Jefferson, Comté de Jefferson, Condado de Jefferson, Condado han Jefferson, Contea di Jefferson, Dzhefersun, Dzhefferson, Hrabstwo Jefferson, Jeferson srjan, Jefferson, Jefferson Kun, Jefferson Kūn, Jefferson konderria, Jefferson megye, Jeffersoni maakond, Okrug DZeferson, Quan Jefferson, Quận Jefferson, jefason jun, jepharasana ka'unti, jie fu xun xian, mqatʿt jyfyrswn, shhrstan jfrswn ayalt mwntana, Джеферсън, Джефферсон, Округ Џеферсон, Ջեֆերսոն շրջան, جیفرسن کاؤنٹی، مونٹانا, جیفرسن کاؤنٹی،مونٹانا, شهرستان جفرسون، ایالت مونتانا, مقاطعة جيفيرسون, জেফারশন কাউন্টি, ジェファーソン郡, 傑佛遜縣

People born in Jefferson County (1)

Montana legislator Terry Murphy was born in Jefferson County

Other places with the same name (25)

Jefferson County Populated Places

Cities, Towns, Neighborhoods & Other Populated Places in Jefferson County.

City Name Population Title
Montana City 2,715 Census designated place
Clancy 1,661 Census designated place
Boulder 1,291 Town in Montana
Whitehall 1,160 Town in Jefferson County, Montana

Montana Other Counties (more counties)

County Name Population Title
Yellowstone County 162,990 County in Montana, United States of America
Missoula County 121,630 County in Montana, United States
Gallatin County 116,806 County in Montana, United States
Billings 109,736 City in Montana, United States of America
Flathead County 105,851 County in Montana, United States
Cascade County 81,346 County in central Montana, United States
Missoula 76,848 County seat of Missoula County, Montana, United States
Lewis and Clark County 70,229 County in Montana, United States
Great Falls 58,353 Town in Cascade County, Montana, United States
Bozeman 50,970 Town in Gallatin County, Montana, United States
Ravalli County 45,002 County in Montana, United States
Silver Bow County 35,180 County in Montana, United States
Butte 34,190 Consolidated city-county in Montana, United States
Helena 33,737 State capital of Montana, United States and seat of Lewis and Clark County
Lake County 30,986 County in Montana, United States
Kalispell 25,329 City in Flathead County, Montana, United States