Population Demographics
As of 2025 the population of Benton County is 42,084. The population is expected to grow to 42,563 by 2030 - a growth rate of 0.23%.
The median age of Benton County residents is 38.
The diversity index of Benton County is 31.9, meaning that there is a 32% chance that any two people selected out of 100 residents will be of different race or ethnicity from one another.