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Which counties in Oklahoma are losing population?

30 of the 77 counties in Oklahoma had fewer residents in 2025 than in 2020. Cimarron County lost the largest share, down 10.0% (−228 people). Texas County lost the most residents (−969).

Of the 30 counties that lost residents between 2020 and 2025, the largest factor was natural change (more deaths than births) in 20 and net domestic migration (more residents moving to other U.S. counties than arriving) in 10 (Census Bureau components of population change).

Data as of 2025 · updated

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All 30 Oklahoma counties that lost residents

Counties losing population in Oklahoma
RankCountyChange 2020–25Residents lost 2020–25Residents 2025Largest factor 2020–25
1Cimarron County−10.0%−2282,059Domestic migration (−166)
2Harmon County−6.0%−1492,327Domestic migration (−83)
3Dewey County−6.0%−2694,207Natural change (−162)
4Roger Mills County−5.0%−1723,259Domestic migration (−152)
5Texas County−4.6%−96920,322Domestic migration (−2,598)
6Kiowa County−3.7%−3158,181Natural change (−359)
7Ellis County−3.4%−1293,613Natural change (−89)
8Beaver County−2.9%−1464,882Domestic migration (−184)
9Caddo County−2.9%−77326,130Natural change (−608)
10Grant County−2.8%−1194,067Natural change (−122)
11Woodward County−2.8%−57419,827Domestic migration (−649)
12Major County−2.7%−2117,536Domestic migration (−150)
13Tillman County−2.4%−1706,780Natural change (−203)
14Harper County−2.3%−743,172Domestic migration (−114)
15Greer County−2.2%−1205,373Natural change (−127)
16Blaine County−2.2%−1898,515Natural change (−202)
17Cotton County−1.9%−1085,432Natural change (−205)
18Woods County−1.8%−1558,443Natural change (−84)
19Garfield County−1.5%−92061,779Domestic migration (−1,457)
20Alfalfa County−1.1%−645,649Natural change (−72)
21Pittsburg County−1.1%−47243,320Natural change (−1,327)
22Choctaw County−1.0%−14614,059Natural change (−396)
23Custer County−1.0%−27328,175Domestic migration (−405)
24Beckham County−0.7%−16722,159Natural change (−223)
25Murray County−0.5%−6813,805Natural change (−259)
26McCurtain County−0.3%−10030,744Natural change (−561)
27Seminole County−0.3%−7523,441Natural change (−584)
28Kay County−0.3%−11543,490Natural change (−460)
29Noble County−0.2%−2610,899Natural change (−301)
30Washita County−0.2%−1910,884Natural change (−223)

How this is ranked

Counties whose Census Bureau resident population estimate for July 1, 2025 is lower than for July 1, 2020, steepest percentage decline first. The largest factor is the most negative of natural change (births minus deaths), net domestic migration and net international migration over the same years (Census Bureau components of population change). Counties with fewer than 1,000 residents, or without a figure for the same period as the others, are left out, as on every ranking.

Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025). Figures come from public federal statistics and are informational only, not investment advice. Check the source before relying on a number. Methodology: how ranks and figures are built. More on every layer: data sources and licences.

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Questions

Which county in Oklahoma is losing population fastest?

Cimarron County: down 10.0% between 2020 and 2025, to 2,059 residents (−228 people; Census Bureau population estimates). Next: Harmon County (−6.0%) and Dewey County (−6.0%).

How many counties in Oklahoma are losing population?

30 of the 77 counties in Oklahoma had fewer residents in 2025 than in 2020; the other 47 grew or held steady.

Why are counties in Oklahoma losing population?

Of the 30 counties that lost residents between 2020 and 2025, the largest factor was natural change (more deaths than births) in 20 and net domestic migration (more residents moving to other U.S. counties than arriving) in 10 (Census Bureau components of population change).

More county rankings for Oklahoma

Counties losing population in other states

Across the U.S.