Counties in Montana by net domestic migration, July to June
Flathead County had the highest net domestic migration, July to June of 56 counties in 2020, at 1,842. Cascade County had the lowest, at -266. The median was 1 and the figure for Montana was 8,960. Source: the U.S. Census Bureau.
All counties, 2020
Full ranking
| Rank | Counties | 2020 | Change on 2019 |
|---|---|---|---|
| 1 | Flathead County Estimated | 1,842 | +18.5% |
| 2 | Gallatin County Estimated | 1,664 | -8.5% |
| 3 | Yellowstone County Estimated | 1,319 | +58.7% |
| 4 | Missoula County Estimated | 1,242 | +91.4% |
| 5 | Ravalli County Estimated | 967 | +13.8% |
| 6 | Lewis and Clark County Estimated | 596 | -14.5% |
| 7 | Lake County Estimated | 455 | +88% |
| 8 | Lincoln County Estimated | 352 | +11.4% |
| 9 | Silver Bow County Estimated | 301 | +133.3% |
| 10 | Sanders County Estimated | 262 | +12.4% |
| 11 | Broadwater County Estimated | 243 | +77.4% |
| 12 | Carbon County Estimated | 223 | +443.9% |
| 13 | Jefferson County Estimated | 221 | +45.4% |
| 14 | Stillwater County Estimated | 207 | +26.2% |
| 15 | Madison County Estimated | 194 | +50.4% |
| 16 | Park County Estimated | 169 | +396.5% |
| 17 | Mineral County Estimated | 140 | +22.8% |
| 18 | Fergus County Estimated | 97 | +298% |
| 19 | Teton County Estimated | 82 | +1,071.4% |
| 20 | Musselshell County Estimated | 71 | +136.7% |
| 21 | Wheatland County Estimated | 57 | +186.4% |
| 22 | Deer Lodge County Estimated | 55 | -32.1% |
| 23 | Chouteau County Estimated | 36 | +148.6% |
| 23 | Richland County Estimated | 36 | +148% |
| 25 | Beaverhead County Estimated | 25 | -53.7% |
| 26 | Petroleum County Estimated | 7 | +138.9% |
| 27 | McCone County Estimated | 3 | +130% |
| 28 | Powell County Estimated | 2 | +103.8% |
| 29 | Granite County Estimated | 0 | +100% |
| 30 | Golden Valley County Estimated | -3 | -400% |
| 31 | Daniels County Estimated | -5 | +91.5% |
| 32 | Garfield County Estimated | -7 | -800% |
| 32 | Prairie County Estimated | -7 | -450% |
| 34 | Powder River County Estimated | -9 | +78% |
| 35 | Meagher County Estimated | -10 | -11.1% |
| 36 | Wibaux County Estimated | -13 | +80.9% |
| 37 | Judith Basin County Estimated | -15 | -125.9% |
| 38 | Carter County Estimated | -16 | -214.3% |
| 38 | Treasure County Estimated | -16 | -180% |
| 40 | Liberty County Estimated | -19 | +72.1% |
| 41 | Sweet Grass County Estimated | -20 | -190.9% |
| 42 | Custer County Estimated | -26 | +87.1% |
| 43 | Toole County Estimated | -28 | +77.8% |
| 44 | Phillips County Estimated | -34 | +63.8% |
| 45 | Sheridan County Estimated | -44 | +30.2% |
| 46 | Fallon County Estimated | -53 | +8.6% |
| 47 | Valley County Estimated | -60 | -76.5% |
| 48 | Pondera County Estimated | -77 | -2.7% |
| 49 | Dawson County Estimated | -84 | -31.3% |
| 50 | Roosevelt County Estimated | -97 | +24.8% |
| 51 | Rosebud County Estimated | -140 | +5.4% |
| 52 | Glacier County Estimated | -167 | +10.7% |
| 53 | Blaine County Estimated | -171 | -52.7% |
| 54 | Big Horn County Estimated | -259 | -65% |
| 55 | Hill County Estimated | -262 | -1,478.9% |
| 56 | Cascade County Estimated | -266 | +56.2% |
Other periods
About this ranking
Estimated moves into an area from elsewhere in the same country minus moves out to the rest of the country, from July 1 of the previous year through June 30 of the reported year. United States: states and counties. Canada: provinces and territories, net interprovincial migration (Statistics Canada). United Kingdom: local authorities, counting moves between any two UK local authorities, including across the borders of England, Wales, Scotland and Northern Ireland (ONS internal migration). A negative value means more people left than arrived.
Sums to zero, or close to it, for each country as a whole, so there is no national value.
Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.
How to cite
U.S. Census Bureau. Population Estimates Program: net domestic migration, states and counties, July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.Citation styles
APA 7
U.S. Census Bureau. (2026). Population Estimates Program: net domestic migration, states and counties, July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021 (Counties in Montana by net domestic migration, July to June, 2020) [Data set]. Retrieved October 12, 2026, from https://www.census.gov/programs-surveys/popest/data/data-sets.html
MLA 9
Population Estimates Program: net domestic migration, states and counties, July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021, Counties in Montana by net domestic migration, July to June, 2020. U.S. Census Bureau, 26 Mar. 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/net-domestic-migration-july-june/montana-counties?period=2020. Accessed 12 Oct. 2026.
Chicago (author-date)
U.S. Census Bureau. 2026. Population Estimates Program: net domestic migration, states and counties, July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021. Counties in Montana by net domestic migration, July to June, 2020. Dataset. Accessed October 12, 2026. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Also distributed by Invokely, https://invokely.ai/rankings/net-domestic-migration-july-june/montana-counties?period=2020.
Harvard
U.S. Census Bureau (2026) Population Estimates Program: net domestic migration, states and counties, July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021, Counties in Montana by net domestic migration, July to June, 2020 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/net-domestic-migration-july-june/montana-counties?period=2020 (Accessed: 12 October 2026).
BibTeX
@misc{census_counties_in_montana_by_2020,
author = {{U.S. Census Bureau}},
title = {{Population Estimates Program: net domestic migration, states and counties, July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021: Counties in Montana by net domestic migration, July to June, 2020}},
year = {2026},
howpublished = {Data set},
url = {https://www.census.gov/programs-surveys/popest/data/data-sets.html},
urldate = {2026-10-12},
note = {Accessed via Invokely, https://invokely.ai/rankings/net-domestic-migration-july-june/montana-counties?period=2020. Publisher attribution: U.S. Census Bureau. Population Estimates Program: net domestic migration, states and counties, July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.},
}
RIS
TY - DATA
AU - U.S. Census Bureau
TI - Population Estimates Program: net domestic migration, states and counties, July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021: Counties in Montana by net domestic migration, July to June, 2020
PY - 2026
DA - 2026/03/26
PB - U.S. Census Bureau
DB - Invokely
UR - https://www.census.gov/programs-surveys/popest/data/data-sets.html
L2 - https://invokely.ai/rankings/net-domestic-migration-july-june/montana-counties?period=2020
Y2 - 2026/10/12
N1 - Accessed via Invokely, https://invokely.ai/rankings/net-domestic-migration-july-june/montana-counties?period=2020.
N1 - Publisher attribution: U.S. Census Bureau. Population Estimates Program: net domestic migration, states and counties, July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.
ER -
Use this data in your AI agent
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Rank Counties in Montana by net domestic migration, July to June using official data, and cite the source.
rank_places {"indicator":"net_domestic_migration_july_june","level":"province","within":"Montana","limit":10}
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Which county has the highest net domestic migration, July to June?
Flathead County, with 1,842 in 2020, according to the U.S. Census Bureau.
Which county has the lowest net domestic migration, July to June?
Cascade County, with -266 in 2020.
Where does this ranking come from?
Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Population Estimates Program: net domestic migration, states and counties, July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021. Retrieved 2026-10-12.