The Posse also completes a number of Pony Express relay rides which take them through numerous surrounding counties.  Every winter, often times through cold and rain, the Junior Deputies ride their horses to deliver the Mayor of Houston's proclamation of the upcoming Houston Livestock Show and Rodeo to other South East Texas Mayors.  In a ceremony on courthouse steps of surrounding County Seats, the Mayor, Sheriff, and County Judge accept the proclamation, personally meet with the children of the Posse, and are always impressed by the showmanship, organization, and maturity of Harris County's young representatives.

The Posse is also involved in the support of the Special Olympics, the MS 150 Ride, the D.A.R.E. Drug Abuse Resistance Education program, supporting the HCSO Deputies deployed in Iraq and Afganistan, and other worthy causes.  On the average, the Posse attends one to two community events (rodeos, parades, service opportunities) a month.  When they are not performing or serving their community, they are diligently practicing their high-speed equine drills two to four weekends a month.