Adna is an unincorporated community located in Lewis County, Washington. Due to its rural setting with little settlement concentration, it did not meet qualifications as a Census Designated Place, a program used by the U.S. Census Bureau for unincorporated communities. Adna is 6 miles west of Chehalis. There are schools available for grades K-12. There is one grocery store which also is a post office and a gas station.