I'm one of those people who loves libraries, so when I was visiting a friend recently I stopped in the library to look around. I went straight to the history section and looked to see if they had any Oklahoma books that aren't available at my local library. Sure enough, there were at least ten. I looked through the index of each one to check for anything about Caddo (isn't that what you always do??). I found the following information and map in Oklahoma Treasures and Treasure Tales, by Steve Wilson. You can read more about it at either Google Books, or Amazon. Both offer an inside look at several pages. (If I do this correctly you should be able to click on the map and get a larger view.)
"As the Missouri, Kansas & Texas Railroad stretched across eastern Oklahoma in 1871, the freighting of supplies and mail to Fort Sill was transferred from Boggy Depot to Caddo, several miles southeast. The new Caddo-Fort Sill road ran by way of Nail's Crossing on the Blue River, Post Oak (Emet), Tishomingo, Mill Creek, Sulphur Springs (Sulphur), Cherokee Town, Pauls Valley, White Bread Hill, Beef Creek (Maysville), Erin Springs, Rush Springs, and then thirty miles southwest to Fort Sill. The fare for the almost two-hundred-mile journey was twenty dollars, and baggage was limited to one hundred pounds for each passenger. The eight-passenger stage made the dusty journey in four days, while the freight wagons took twice that long."
"The most noted stage route through the Indian Nations was the Butterfield Overland Mail, which ran from St. Louis, Missouri, through Indian Territory, and across Texas, New Mexico, and Arizona to San Francisco, California- a distance of twenty-eight hundred miles. About two hundred stage stations were established over the route, most of them about twenty miles apart."