[3] St. David was established as a result of the Mormon Battalion having earlier passed through the San Pedro River valley in 1846.

[6] The early St. David settlers played an important role in establishing the subsequent surrounding settlements, such as Fort Huachuca and Tombstone, as they did much of the logging in the Huachuca Mountains to provide lumber for the construction of those locations.

[7] As a tight-knit Mormon community, St. David managed better than other small towns in Cochise County during the Great Depression.

[8] An influx of non-Mormons, principally from Oklahoma and Texas, took place when St. David became the site for Civilian Conservation Corps Camp SCS-19-A from 1935 to 1940.

[10] According to the United States Census Bureau, the CDP has a total area of 5.3 square miles (14 km2), all land.

[12] St. David has a semi-arid climate (Köppen: BSk) with cool winters, hot summers, and large diurnal temperature variation throughout the year.

[17] In 1938 a brick schoolhouse was built, it still stands today and is on the National Register of Historic Places.

[citation needed] The annual San Pedro Valley Fair has been held at the St. David High School since 1934.