Almost all Centreville Day activities are free, thanks to the support of several vendors and sponsors, including the Korean Central Presbyterian Church, Apple Federal Union Bank, CPA Bryan Hunt, Historic Centreville Society, Centreville-Chantilly Rotary, American Disposal Services, Signarama of Centreville, Alpha Delta Kappa, Post 1995 of the American Legion, the Fairfax County Park Authority and the Friends of Historic Centreville.