Hereford is a populated place in Cochise County along the San Pedro Riparian National Conservation Area in the southern part of the U.S. state of Arizona. It is southeast of Sierra Vista and is a part of the Sierra Vista-Douglas micropolitan area. The elevation is 4,193 feet at the location of the original townsite at the far eastern end of the unincorporated area; the residential area runs for another 8 miles west from this location, blending into the unincorporated area of Nicksville at an elevation of approximately 4800'. Hereford Station Post Office is located at the far western end of Nicksville, at the foot of the Huachuca Mountains.

Cochise County is a county in the southeastern corner of the U.S. state of Arizona. It is named after Cochise, a Chiricahua Apache who was a key war leader during the Apache Wars.