Is Mercer County, MO's population growing or shrinking?
Refreshed annually
It shrank by 10 between 2024 and 2025. Changes in population reflect birth and death rates, immigration patterns, regional shifts, and even the overall health of the economy. Mercer County, MO’s 0.29% annual decrease was primarily driven by people moving to other states.
In the decade between 2015 and 2025, Mercer County, MO’s population shrank by 7%.
-10
population change (2024 to 2025)
-0.29%
percent change in population (2024 to 2025)
Since 2000, Mercer County, MO’s population increased 6 out of 25 years. The largest increase occurred between 2009 and 2010, when Mercer County, MO gained 312 residents. Its largest decline occurred between 2019 and 2020 when there were 103 fewer residents.
Mercer County, MO lost 10 residents between 2024 and 2025.
Annual population change, 2001–2025
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What contributes to population change in Mercer County, MO?
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 Mercer County, MO, with deaths exceeding births by two.
- 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, Mercer County, MO’s population change from immigration was positive with about 12 more people coming from another country directly to Mercer County, MO than leaving.
- Domestic migration, moving between counties: Between 2024 to 2025, Mercer County, MO’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, domestic migration was the primary driver of population decline in Mercer County, MO.
Components of population change from previous year, 2011–2025
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
Page sources
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.
