The Community was originally known as Beaver Creek as ranchers and farmers settled along the banks of the creek named for the prolific numbers of beavers found there. In 1882, when there were a total of 8 local children, Yavapai County set up one of the first schools in the Verde Valley, Beaver Creek School, drawing kids from many miles around the area.
The area of the community known as McGuireville started in 1910 when Eugene McGuire settled near the confluence of Dry Beaver Creek and Wet Beaver Creek. This was also at the junction of the historic road from Stoneman Lake which split there with one route going on to Cornville, Cottonwood and Jerome and the other going south to Camp Verde and on to Prescott via Cherry. This later became the site of the first local business besides ranching and dudes when Midge Montgomery set up the original Beaver Creek Store there in 1931.
The area generally became known as Rimrock in 1926 when Virginia Finnie, the daughter of a prominent local rancher, started a dude ranch which she appropriately named Rimrock Guest 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 so the former area of Beaver Creek School district generally became known as Rimrock. Interestingly Arizona's oldest continuously operated landing strip - The Rimrock Airport is located here as dudes used to fly into the ranch in a day gone by.
Around 1957 shortly after the Black Canyon Highway was built north from Phoenix one of the largest ranches in Rimrock was turned into a subdivision called Lake Montezuma. The developers were planning on selling much of the property to out of state buyers and realized they needed something attractive in the name. The dug out a pond below the original ranch house and named it Lake Montezuma after the areas most significant local land mark - Montezuma Well National Monument.
The majority of the population of the rapidly growing area soon lived in this one subdivision and virtually all of them were not from the local area. They would identify themselves as being from Lake Montezuma not realizing that they might also be considered a resident of Rimrock and also Beaver Creek. Thus the confusion over the name of the general area.
There were 1,471 households out of which 20.6% had children under the age of 18 living with them, 51.7% were married couples living together, 8.5% had a female householder with no husband present, and 36.2% were non-families. 28.0% of all households were made up of individuals and 11.9% had someone living alone who was 65 years of age or older. The average household size was 2.27 and the average family size was 2.73.
In the CDP the population was spread out with 19.6% under the age of 18, 6.4% from 18 to 24, 24.5% from 25 to 44, 28.5% from 45 to 64, and 21.1% who were 65 years of age or older. The median age was 45 years. For every 100 females there were 92.7 males. For every 100 females age 18 and over, there were 92.1 males.
The median income for a household in the CDP was $33,750, and the median income for a family was $36,864. Males had a median income of $22,365 versus $21,538 for females. The per capita income for the CDP was $17,043. About 7.2% of families and 9.1% of the population were below the poverty line, including 12.4% of those under age 18 and 1.4% of those age 65 or over.