[2] Prior to the 2023 governance reform, for governance purposes it was divided between the villages of Aroostook and Perth-Andover[3] and the local service district of the parish of Andover,[4] all of which were members of the Western Valley Regional Service Commission (WVRSC).

[5] Historian William F. Ganong related that the local explanation was that it was named by a Mr. Sisson, who came from Andover, England.

In 1850 the parish was extended north to where the Saint John River crosses the international boundary.

[8] In 1853 all of Andover north of the Aroostook River was included in the newly erected Grand Falls Parish.

[10][11][12][13] Parish population totals do not include the former incorporated villages of Aroostook and portion within Perth-Andover.