Sources generally agree on the identity of a Pony Express station at Fort Laramie.  However, the exact location of the station at or near Fort Laramie remains unknown. Nevertheless, the well-known fort's distance from stations at Sand Point and Verling's Ranch makes the area just west of the post a logical station site.  Fort Laramie's adobe-stone sutler's store, which still exists, housed a post office in the 1850s, 1870s, and 1880s. Its status during the Pony Express era remains unknown.

http://www.nps.gov/parkhistory/online_books/poex/hrs/hrs5d.htm#56