Formerly, two thirds of the  parish of Ashkirk lay in Roxburghshire and one third in Selkirkshire, including an enclave of Selkirkshire just east of the village around Synton.
Historically, two-thirds of the Ashkirk parish belonged to Roxburghshire and one-third to Selkirkshire, encompassing a Selkirkshire section adjacent to the village around Synton.