Pont y Maerdy (Unclassified).
Grid Reference: SJ 01531 44568. Parish: Llangwm, Denbighshire
When recorded: 1699. Primary Source: Parochialia 2. Secondary Source: none

Rhos -y-maerdy (Unclassified).
Grid Reference: SJ 05914 38717. Parish: Llandrillo-yn-Edeirnion, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Rhyd-y-maerdy (Settlement).
Grid Reference: SN 54921 14211. Parish: Llanarthne, Carmarthenshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Taren Maerdy (Unclassified).
Grid Reference: SS 97962 97233. Parish: Rhondda, Glamorgan
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Upper Maerdy (Unclassified).
Grid Reference: SO 45743 03471. Parish: Devauden (North), Monmouthshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Upper Maerdy (Unclassified).
Grid Reference: SO 39989 01048. Parish: Llantrisant Fawr (North), Monmouthshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Waun Maerdy Phon (Field).
Grid Reference: SN 90398 13036. Parish: Ystradfellte, Brecknockshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Ynismaerdy (Settlement).
Grid Reference: SS 74901 94926. Parish: Neath, Glamorgan
When recorded: 1699. Primary Source: Parochialia 3. Secondary Source: none

Ynys-maerdy (Unclassified).
Grid Reference: ST 03279 83894. Parish: Llanharan, Glamorgan
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

YNYSMAERDY CEMETERY (Unclassified).
Grid Reference: SS 74660 95042. Parish: Neath, Glamorgan
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website