Is Riley County, KS's population growing or shrinking?
Refreshed annually
It grew by 526 between 2024 and 2025. Changes in population can reflect birth and death rates, immigration patterns, regional shifts, and even the overall health of the economy. The 0.73% annual increase was primarily driven by immigration to the state.
In the decade between 2015 and 2025, Riley County, KS’s population shrank by 6.1%.
+526
population change (2024 to 2025)
+0.73%
percent change in population (2024 to 2025)
Since 2000, Riley County, KS’s population increased 15 out of 25 years. The largest increase occurred between 2011 and 2012, when Riley County, KS gained 4,100 residents. Its largest decline occurred between 2018 and 2019 when there were 2,100 fewer residents.
Riley County, KS gained 526 residents between 2024 and 2025.
Annual population change, 2001–2025
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What contributes to population change in Riley 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 positive in Riley County, KS, with births exceeding deaths by 300.
- 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, Riley County, KS’s population change from immigration was positive with about 359 more people coming from another country directly to Riley County, KS than leaving.
- Domestic migration, moving between counties: Between 2024 to 2025, Riley County, KS’s population change from domestic migration was negative with about 140 more people moving to any other county in the US.
Between 2024 and 2025, immigration was the primary driver of population growth in Riley 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.
