Mills
Natrona County4,199 in 2020·4,634 in 2025·+435 people
Wyoming rankings · Growth
Fastest-growing towns in Wyoming
Mills has grown fastest of Wyoming’s 24 towns of 2,500+: up 10.4% from 4,199 residents in April 2020 to an estimated 4,634 in July 2025 (Census Bureau estimates). The typical town here changed +1.1%; 11 of the 24 lost residents.
Census Bureau population estimates, Vintage 2025: July 1, 2025 against the April 2020 base, both on January 2025 town lines (people a town annexed are in its base, not its growth). Estimates, not counts. Unincorporated communities (census-designated places) get no estimate, so they aren’t listed. A described list: no letters. How grades work
+10.4%
#2Buffalo
Johnson County4,429 in 2020·4,733 in 2025·+304 people
#3Sheridan
Sheridan County18,756 in 2020·20,015 in 2025·+1,259 people
All 24 towns
Growth since 2020, highest first.
24 towns ranked. Not here? See why a town may be missing.
#TownGrowth since 2020People addedResidents
Quick answers
Questions people ask
What is the fastest-growing town in Wyoming?
Mills (Natrona County): it grew 10.4%, from 4,199 residents in April 2020 to an estimated 4,634 in July 2025. Buffalo (+6.9%) and Sheridan (+6.7%) follow.
How are these towns ranked?
By the percent change in residents from the Census Bureau’s April 2020 estimates base to its latest July 1 estimate, highest first, on the exact change: two towns shown with the same tenth of a percent keep the order of their unrounded figures, and only an identical change shares a rank (T). The base is the 2020 Census count redrawn on today’s town lines, so a town that annexed land since 2020 changes only by births, deaths and moves, not by the people it took in. How grades work.
Why isn’t my town on this list?
The list covers the towns TownRatings grades that had 2,500+ residents in the 2020 estimates base (24 in Wyoming). Census-designated places (unincorporated communities) have no Census Bureau estimates, so they never appear; a town incorporated since 2020, or one TownRatings merges with its twin township, isn’t listed either. Every town is on the Wyoming page.
Go deeper
All Wyoming rankings →More Wyoming lists
Every list ranks the same 2,500+ towns, so a town’s rank means the same thing on each.
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