Blaine County, Montana

Blaine County: County in northern Montana, United States


Blaine County is a county located in the U.S. state of Montana. As of the 2010 census, the population was 6,491 and a population density of 1 people per km². After 10 years in 2020 county had an estimated population of 6,568 inhabitants. Its county seat is Chinook. The county was created 128 years ago in 1894.

Quick Facts about Blaine County

Population : 6,568 (2020)
Country : United States of America
State : Montana (United States)
Different from : Blaine County, Blaine County, Blaine County
Area : 10979 km2
Water as percent of area : 0.3%
Land as percent of area : 99.7%
Named for : James G. Blaine
Capital : Chinook
Establishment : January 01, 1895
Time Zone : America/Denver
Local time : 05:44:40 (7th February 2023)
Density : 1 Pop. per km² as of 2020
Population growth : 1.17% (2010-2020)
Blaine County locator map
Location of Blaine County on Montana map.
Blaine County Courthouse image
Blaine County Courthouse
Blaine County Courthouse image


Blaine County is located at 48°25'58"N 108°57'31"W (48.4327600, -108.9586600). It has 4 neighbors: Phillips County, Hill County, Chouteau County and Fergus County.

Blaine County map

The largest city of Blaine County is Chinook with a population of 1,230. Other cities include and Harlem population 778. See all Blaine County cities & populated places.

Blaine County Populated Places

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

City Name Population Title
Fort Belknap Agency 1,293 Census designated place
Chinook 1,230 City in Montana
Harlem 778 City in Blaine County, Montana, United States

Blaine County has 4 neighbours.

  • Chinook


The population of Blaine County increased by 1.17% in 10 years.

Year Population % Change Method
2010 6,491 - census
2011 6,575 1.28% estimation process
2012 6,680 1.57% estimation process
2013 6,637 -0.65% estimation process
2014 6,710 1.09% estimation process
2015 6,680 -0.45% estimation process
2016 6,716 0.54% estimation process
2017 6,745 0.43% estimation process
2018 6,774 0.43% estimation process
2019 6,681 -1.39% estimation process
2020 6,568 -1.72% estimation process

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Other places with the same name (4)

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