Wrexham County Borough is in north-east Wales, straddling the ancient border earthwork Offa's Dyke.
To the east of the dyke are the majority of the 18 medieval sites, mainly domestic, defensive or ecclesiastical.
Close by, clustered around the coal and mineral deposits in a central belt are also the 19 post-medieval sites.
The compilation of the list is undertaken by Cadw Welsh Historic Monuments, which is an executive agency of the National Assembly of Wales.
[1] The list of scheduled monuments below is supplied by Cadw[2] with additional material from RCAHMW and Clwyd-Powys Archaeological Trust.