The town's post office opened as "Garza's Crossing" on January 16, 1872, under postmaster William G. M. Samuel. It was closed May 7, 1874, but was reestablished June 10, 1875, under new postmaster Robert J. Sibert. It was again discontinued August 16, 1875. On January 14, 1879, a new post office was reopened using the name "Mann's Crossing", with postmaster Anton F. Krause. This, too, was closed (November 9, 1880). It was again reestablished under postmaster Branson Bywater on September 13, 1886. On December 4, 1886, the post office changed its name to "Von Ormy", which has since remained the town's designation.