Lawson is an unincorporated community and census-designated place in Union County, Arkansas, United States. Lawson was founded by Lawson Smith, who was born in 1813 and died in 1899. Lawson is located on Arkansas Highway 129, 10.5 miles east of El Dorado. Lawson has a post office with ZIP code 71750. It was first listed as a CDP in the 2020 census with a population of 260.