NDT Companies in Clarksville, Arkansas

Clarksville is a city in Johnson County, Arkansas, United States. As of the 2020 census the population was 9,381, up from 9,178 in 2010. The city is the county seat of Johnson County.

Ozone is an unincorporated community and census-designated place in Johnson County, Arkansas, United States. Ozone is located on Arkansas Highway 21, 11.5 miles north of Clarksville. It was first listed as a CDP in the 2020 census with a population of 92. Ozone has a post office with ZIP code 72854.