Strawberry Plains is an unincorporated community straddling the boundary between Jefferson, Knox, and Sevier counties in the U.S. state of Tennessee. Before 2010, it was treated by the United States Census Bureau as a census county division.Strawberry Plains is located on the bank of the Holston River. According to the United States Geological Survey, a variant is Straw Plains. Strawberry Plains has been the site of a post office since 1806. The zip code is 37871, though parts of Strawberry Plains are located in the zip codes 37914 and 37924.