The original town of Tres Pinos had been here for more than a decade when its post office opened on January 24, 1871. The town lost the use of its name after August 12, 1873, when the Southern Pacific Railroad opened the Tres Pinos station 4.7 miles away. The town changed its name to Grogan on August 4, 1874, and the Tres Pinos post office re-opened near the station six days later. On October 10, 1874, the former town of Tres Pinos assumed its current name, taken from the nearby Rancho Cienega de los Paicines.

April 17, 2004
Monterey Viejo Chapter 1846
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