19 of them:
Clayton, Alabama town
Clayton, California city
Clayton, Delaware town
Clayton, Georgia city
Clayton, Idaho city
Clayton, Illinois village
Clayton, Indiana town
Clayton, Iowa city
Clayton, Kansas city
Clayton, Louisiana town
Clayton, Michigan village
Clayton, Missouri city
Clayton, New Jersey borough
Clayton, New Mexico town
Clayton, New York village
Clayton, North Carolina town
Clayton, Ohio city
Clayton, Oklahoma town
Clayton, Wisconsin village
And Clayton, Sidney, Mohammed and Jugdish.