 State Route 221 ( SR 221 ) is a 25 @.@ 95 @-@ mile ( 41 @.@ 76 km ) long state highway located entirely within Benton County , Washington , United States . The highway serves to connect the unincorporated community of Paterson to the county seat Prosser . The highway has existed since at least 1926 and was designated as Primary State Highway 8E from 1937 until the 1964 renumbering of Washington state highways . 
 State Route 221 ( SR 221 ) <a href='drop_aux' title='1'><mark>is</mark></a>a 25 @.@ 95 @-@ mile ( 41 @.@ 76 km ) long state highway located entirely within Benton County , Washington , United States . The highway <a href='uninflect' title='2'><mark>serves</mark></a> to connect the unincorporated community of Paterson to the county seat Prosser . The highway <a href='been_done' title='3'><mark>has</mark></a> existed since at least 1926 and was designated as Primary State Highway 8E from 1937 until the 1964 renumbering of Washington state highways . 
State Route 221 ( SR 221 ) a 25 @.@ 95 @-@ mile ( 41 @.@ 76 km ) long state highway located entirely within Benton County , Washington , United States . The highway serve to connect da unincorporated community of Paterson to the county seat Prosser . Tdahighway done existed since at least 1926 and was designated as Primary State Highway 8E from 1937 untill the 1964 renumbering of Washington state highways .