Is Allen County, KS's population growing or shrinking?
Refreshed annually
It shrank by 59 between 2024 and 2025. Changes in population reflect birth and death rates, immigration patterns, regional shifts, and even the overall health of the economy. Allen County, KS’s 0.48% annual decrease was primarily driven by deaths outpacing births.
In the decade between 2015 and 2025, Allen County, KS’s population shrank by 3%.
-59
population change (2024 to 2025)
-0.48%
percent change in population (2024 to 2025)
Since 2000, Allen County, KS’s population increased 2 out of 25 years. The largest increase occurred between 2019 and 2020, when Allen County, KS gained 129 residents. Its largest decline occurred between 2000 and 2001 when there were 240 fewer residents.
Allen County, KS lost 59 residents between 2024 and 2025.
Annual population change, 2001–2025
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What contributes to population change in Allen County, KS?
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 Allen County, KS, with deaths exceeding births by 67.
- 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, Allen County, KS’s population change from immigration was positive with about 38 more people coming from another country directly to Allen County, KS than leaving.
- Domestic migration, moving between counties: Between 2024 to 2025, Allen County, KS’s population change from domestic migration was negative with about 30 more people moving to any other county in the US.
Between 2024 and 2025, natural change was the primary driver of population decline in Allen County, KS.
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.
