Population Demographics
As of 2025 the population of Benton County is 20,538. The population is expected to grow to 21,312 by 2030 - a growth rate of 0.74%.
The median age of Benton County residents is 53.
The diversity index of Benton County is 18.2, meaning that there is a 18% chance that any two people selected out of 100 residents will be of different race or ethnicity from one another.