The area generally became known as Rimrock in 1928 when Virginia Finnie, the daughter of a prominent local rancher, married Romaine Lowdermilk and the couple along with partner Russell Boardman started a dude ranch originally called Rimrock Lodge later known as Rimrock Dude Ranch. It was so named for the prominent limestone rimrocks forming the edges of the mesas visible from the hill top ranch. Her prominent guests were wanting efficient communications with the outside world so Virginia saw the need to establish a post office on the ranch. Virginia's Mother-in-law, Ella Loudermilk, became the first post mistress of the newly established Rimrock Post Office chartered July 11, 1928. People from the Coconino County line near Stoneman Lake, Apache Maid Ranch etc. and up and down the creek nearly to Camp Verde, picked up their mail at the Rimrock Post Office. The former area of Beaver Creek School district thus generally became known as Rimrock. One of Arizona's oldest continuously operated landing strips - The Rimrock Airport - is located here as dudes used to fly into the ranch in days gone by.