Boeing Aviation Fields

Historical marker location:

5500 Clayton Ave, Saint Louis, Missouri

( Marker is on Clayton Avenue east of McKinley Drive, on the right when traveling east.)

The Pony Express, a mail delivery service that operated from 1860 to 1861, had a route that went through Missouri. The service used a network of riders and relay stations to transport mail from St. Joseph, Missouri, to Sacramento, California, in just 10 days.