Butterfield Southern Overland Mail Co.
Vishner in Pony Express writes, "It was established early in 1858 from St. Louis to San Francisco, 2,759 miles. Started as a semi-weekly but was soon made six days a week.
Farish says: "The government paid a million dollars a year for this daily service, on a 20-day schedule. In 1861, due to the war, Congress authorized the company to change their route from Arizona to the central route via South Pass, Colorado and Salt Lake." The first Butterfield stage via Arizona from the east arrived at Los Angeles Oct. 7, 1858.