Post Office In 1862 Huntsville, a stage route was located 3 miles north of current day Larkspur and was the first Douglas County post office established by Daniel Oakes postmaster for district 6.  Mail was delivered by pony express to Hunts Mountain. This postoffice was discontinued in 1867 and then re-established in 1869.  In 1871 the Denver and Rio Grande RR came to Larkspur and the postoffice was moved from Huntsville to Larkspur and located in the Denver and Rio Grande depot there.

The town of Larkspur was so named by governor Hunt's wife Elizabeth after the flower which grows abundantly in the area.  Larkspur then became a real RR town with freight of gypsum, clay, lumber, creamery products and a passenger line.

It is interesting to note that the Larkspur Post Office has been continuously in use since 1869. When the Greenland Post Office closed in 1959 it was replaced by a rural route from Larkspur.