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The total population of Williamson is estimated to be 139 with 80 males (57.55%) and 59 females (42.45%). There are 21 less females than males in Williamson.
In 2022, the population of Williamson was 122, a 1.67% increase year-by-year from 2021. Previously, in 2021, Williamson's population was 120, an increase of 2.56% compared to a population of 117 in 2020.
The median age in Williamson, IA is 29.1, as per 2021 ACS 5-Year Estimates. Of the total population, 33.13% were under the age of 15, 19.63% aged 15 to 29, 34.36% aged 30 to 64, 11.66% aged 65 to 84, and 1.23% were 85 years of age and older.
Racial distribution of Williamson population: 94.48% are White, 1.23% are some other race and 4.29% are multiracial.