Is Deer Lodge County, MT's population growing or shrinking?
Refreshed annually
It shrank by 57 between 2024 and 2025. Changes in population reflect birth and death rates, immigration patterns, regional shifts, and even the overall health of the economy. Deer Lodge County, MT’s 0.58% annual decrease was primarily driven by deaths outpacing births.
In the decade between 2015 and 2025, Deer Lodge County, MT’s population grew by 6.5%.
-57
population change (2024 to 2025)
-0.58%
percent change in population (2024 to 2025)
Since 2000, Deer Lodge County, MT’s population increased 13 out of 25 years. The largest increase occurred between 2009 and 2010, when Deer Lodge County, MT gained 562 residents. Its largest decline occurred between 2000 and 2001 when there were 167 fewer residents.
Deer Lodge County, MT lost 57 residents between 2024 and 2025.
Annual population change, 2001–2025
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What contributes to population change in Deer Lodge County, MT?
A county’s population is influenced by three factors:
- Natural population change: If births outnumber deaths in a given year, natural population growth is positive. If deaths exceed births, it is negative. Between 2024 and 2025 natural population change was negative in Deer Lodge County, MT, with deaths exceeding births by 41.
- Immigration: international migration directly into or out of a county: If more people move in than move out, population change from immigration is positive. If more people move out than move in, it’s negative. Between 2024 to 2025, Deer Lodge County, MT’s population change from immigration was positive with about four more people coming from another country directly to Deer Lodge County, MT than leaving.
- Domestic migration, moving between counties: Between 2024 to 2025, Deer Lodge County, MT’s population change from domestic migration was negative with about 20 more people moving to any other county in the US.
Between 2024 and 2025, natural change was the primary driver of population decline in Deer Lodge County, MT.
Components of population change from previous year, 2011–2025
How is the US population changing?
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
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USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
