Mazama (Post Office) adopted in the 1930 BC Gazetteer; confirmed 6 October 1936 on 92H/E. Name changed to Osprey Lake (Post Office) 2 March 1950 on 92H.

Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office

Princeton Crossing Post Office was opened 1 July 1914, situated on L2103, Florence Chapman postmistress; so-named because this was the first crossing of Trout Creek by the old trail from Princeton to Okanagan Lake. Re-named Mazama Post Office 1 February 1917, still located at L2103, Florence Chapman still postmistress. Post office moved to L4171 and re-named Osprey Lake Post Office 3 April 1950. (Osprey Lake railway station was relocated from L4375 to L4171 at about the same time) Osprey Lake Post Office closed 31 October 1951; Osprey Lake station closed soon after.

Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office

The name (the Spanish name of the mountain goat, which were found hereabouts until even recent years) was suggested to the Post Office authorities c. 1917 by the Chapman families, residents here since 1913. (12th Report of the Okanagan Historical Society, 1948, citing R.S. Chapman)

Source: included with note