[1] It was amalgamated in 1998 from the former townships of Bedford, Loughborough, Portland, and Storrington.

[5] According to the Canada 2021 Census:[9] South Frontenac, along with Central Frontenac, North Frontenac and the Frontenac Islands, send students to schools part of the Limestone District School Board, based in neighbouring Kingston.

A village named Portland is located in Township of Rideau Lakes approximately 60 kilometres east of the former Portland township.

It is unknown if the township and the village had any connections with the same name due to its close proximity.

In 1998, Portland Township was amalgamated into South Frontenac.