Find Post office Near Me in Clayton Welcome to our new site: catalog of Post office of Clayton, Texas. Find Post office Near Me. Closed now United States Postal Service Establishment Finance Post office +1 800-275-8777 4535 ⛉ w Highway 315, Clayton, TX 75637 TEXAS-PAGES.COM Clayton Post office Types of organizations in Clayton, Texas All types Car repair Church Establishment Finance Fire station Home goods store Place of worship Post office