Find Post office Near Me in Marathon Welcome to our new site: catalog of Post office of Marathon, Texas. Find Post office Near Me. United States Postal Service Establishment Finance Post office +1 800-275-8777 107 E US Highway 90, Marathon, TX 79842 TEXAS-PAGES.COM Marathon Post office Types of organizations in Marathon, Texas All types Airport Art gallery Cafe Car repair Church Establishment Finance Food Gas station General contractor Health Library Liquor store Local government office Lodging Museum Place of worship Police Post office Rv park School Storage Supermarket