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County · Montana

Jefferson County

13,304Population
10.1 %Change since 2020
240Net migration
3.0 %Unemployment rate

Facts

Population
13,304 (2024)
Change since 2020
10.1 %
Net migration
240 (2023)
Unemployment rate
3.0 % (2025)
State
Montana
Population base, April 2020
12,082 (2020)
Births
111 (2023)
Births per 1,000 residents, 2023
8.3
Deaths
132 (2023)
Deaths per 1,000 residents, 2023
9.9
Natural change, 2023
-21
International migration
2 (2023)
Domestic migration
238 (2023)
Net migration per 1,000, 2023
18.0
Postal code
MT
FIPS code
30043

Sources: US Census Bureau — Population Estimates, Bureau of Labor Statistics — LAUS

Unemployment rate, annual average

199020253.05.0
PeriodValue
20253.0 %
20242.9 %
20232.7 %
20222.6 %
20213.3 %
20205.1 %
20193.4 %
20183.8 %
20174.3 %
20164.6 %
20154.2 %
20144.6 %

Population estimates, 2020–2024

2020202413.3K12.1K
PeriodValue
202413,304
202313,086
202212,864
202112,472
202012,142