According to the U.S. Census Bureau, the agency estimates that up to 5% of Arkansas' population (a little over 150,000 people) were not counted in the 2020 census. Arkansas's percentage of undercount was the highest in the country, and only five other states were estimated to have any substantive undercounting. While Arkansas did not lose any Congressional seats due to the undercounting, other states did. And, despite the undercount, Arkansas still did see population growth of nearly 100,000 people over the 10 year period from 2010 to 2020. It is likely that the undercounting of the 2020 census will impact the distribution of federal dollars into Arkansas.
More below:
https://www.arkansasonline.com/news/2022/may/20/arkansas-undercounted-its-population-by-more-than/