[2] It is included in the Record of Protected Structures maintained by Westmeath County Council.

[3] St. Mary's Church of Ireland church is situated on an elevated site within Athlone's former town walls.

The boundary walls of the site, which has been occupied by a church since at least the 1620s, may contain fabric from the 17th-century town walls.

[2] Described in A Topographical Dictionary of Ireland (published by Samuel Lewis in 1837) as "a neat edifice, with a square embattled tower",[4] its construction was funded by the Board of First Fruits and its design is attributed to Richard Richards of County Roscommon.

[3][5] It was extended, c. 1869,[2] when James Rawson Carroll added a new chancel to the east.