• county
  • FIPS 30095
  • Largest town: Columbus

Stillwater County, Montana

Stillwater County had 9,450 residents in the Census Vintage 2024 estimate, on 1,796.5 square miles of land. It ranks 25th of 56 in Montana by population and 38th by land area.

Population
9,450
#25 of 56 in Montana · #2,455 in US
Area
1,796.5 sq mi
#38 of 56 in Montana · #329 in US
Density
5.3 / sq mi
#18 of 56 in Montana · #2,759 in US
Median household income
$81,392
#3 of 56 in Montana · #432 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Stillwater County within Montana. Pin: Helena.

Measure from here

Tools and pages that start from Stillwater County

Stillwater County population, land area and income

Stillwater County had 9,450 residents in the Census Vintage 2024 estimate, on 1,796.5 square miles of land. It ranks 25th of 56 in Montana by population and 38th by land area. That works out to 5.3 people per square mile, below the US average of 96.3, and in the bottom quarter nationally.

The median county-equivalent in Montana has 7,814 residents; Stillwater County is somewhat larger.

Its SAIPE 2023 median household income of $81,392 is in the top quarter among 3,143 counties with an estimate.

National rank among 3,144

Population

9,450

3144th1st

2455th of 3,144 (US)

Land area

1,797 sq mi

3144th1st

329th of 3,144 (US)

Density

5.3 / sq mi

3144th1st

2759th of 3,144 (US)

Median household income

$81,392

3143rd1st

432nd of 3,143 (US)

Rank within Montana (56)

Population

9,450

56th1st

25th of 56 (MT)

Land area

1,797 sq mi

56th1st

38th of 56 (MT)

Density

5.3 / sq mi

56th1st

18th of 56 (MT)

Median household income

$81,392

56th1st

3rd of 56 (MT)

How Stillwater County's population changed since 2020

Stillwater County gained 448 residents between the July 2020 and July 2024 estimates, a rise of 5.0%. That ranks 18th of 56 in Montana for growth. The median Montana county changed by +2.8%, and the state as a whole by +4.6%.

Since the April 2020 estimates base, Stillwater County recorded 369 births and 433 deaths, a natural change of -64. Net international migration added -3 and net domestic migration, people moving to or from other US counties, came to +554. The largest single component was domestic migration, which added 554 people.

9,00220209,02620219,19420229,23720239,4502024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
369
Deaths
433
Net international migration
-3
Net domestic migration
+554
Change, July 2023 to July 2024
+213

Where Stillwater County is

The Census internal point of Stillwater County is at 45.658500, -109.381600. It sits in UTM zone 12N. The map shades Montana's 56 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Stillwater County outlined. Dots are towns of 1,000+ people with residents in it.

Liberty County: -1.2%Golden Valley County: +5.1%Dawson County: -2.1%Flathead County: +9.2%Beaverhead County: +6.7%Prairie County: +2.0%Garfield County: +0.9%Lewis and Clark County: +5.5%Sweet Grass County: +2.4%Wheatland County: -0.7%Ravalli County: +8.5%Jefferson County: +9.6%Carter County: -0.6%Chouteau County: -0.6%Custer County: +0.9%Teton County: +3.1%Granite County: +9.0%Deer Lodge County: +4.1%Cascade County: +0.1%Powder River County: +2.4%Meagher County: +7.3%Daniels County: -1.7%Glacier County: -1.8%Wibaux County: -2.7%Fallon County: -2.7%McCone County: -0.7%Sheridan County: -2.5%Missoula County: +3.5%Toole County: +3.7%Sanders County: +11.5%Roosevelt County: -5.6%Rosebud County: -1.3%Treasure County: -2.5%Yellowstone County: +3.9%Blaine County: -1.4%Musselshell County: +14.8%Broadwater County: +21.0%Powell County: +2.6%Fergus County: +3.4%Phillips County: +0.1%Gallatin County: +6.2%Silver Bow County: +2.6%Madison County: +12.6%Richland County: -4.4%Lake County: +6.9%Valley County: -1.7%Judith Basin County: +4.3%Hill County: -1.2%Big Horn County: -2.2%Stillwater County: +5.0%Carbon County: +9.4%Mineral County: +13.7%Petroleum County: +4.6%Pondera County: +3.4%Park County: +4.9%Lincoln County: +12.4%
Change 2020 to 2024
  1. < -1.4%
  2. < +0.9%
  3. < +3.9%
  4. < +7.3%
  5. ≥ +7.3%
no data

Orange pin: Stillwater County internal point. Dark pin: Helena.

Internal point

Decimal
45.658500, -109.381600
DMS
45°39'30.60"N 109°22'53.76"W
UTM
12N 626084.8E 5057379.4N
Geohash
c845wzysp
Plus code
85QGMJ59+C9

Towns in Stillwater County

One incorporated place of 1,000+ people has residents in Stillwater County, 1,966 people together, or 21% of the county. Each figure counts only the part of the town inside Stillwater County; towns marked "part" extend into another county. The largest is Columbus with 1,966.

  1. 01Columbus1,966
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Stillwater County

The Census 2024 county adjacency file lists 5 neighbors for Stillwater County. The most populous is Yellowstone County, MT, with 171,583 residents. Distances run between Census internal points in a straight line.

Distance to Helena and the nearest big city

Helena is 141.5 miles WNW of Stillwater County's internal point in a straight line. The nearest place of 100,000 or more is Billings, MT (population 121,483), 41.0 miles away.

Stillwater County FIPS code

The FIPS code of Stillwater County is 30095: state code 30 for Montana plus county code 095. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $81,392.

Questions people ask

What is the population of Stillwater County, Montana?

The Census Vintage 2024 estimate for July 1, 2024 is 9,450. That is up 448 people (5.0%) from the July 2020 estimate of 9,002.

What is the FIPS code of Stillwater County?

30095. The first two digits (30) are Montana; the last three (095) identify the county.

What is the largest town in Stillwater County?

Columbus, with 1,966 residents inside Stillwater County in 2024.

Which counties border Stillwater County?

5 county-equivalents border it in the Census 2024 adjacency file: Yellowstone County, MT; Park County, MT; Carbon County, MT; Sweet Grass County, MT; Golden Valley County, MT.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.