Bryn-maerdy (Unclassified).
Grid Reference: SN 95365 06266. Parish: Rhigos, Glamorgan
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Cae dau gwaun Maerdy (Field).
Grid Reference: SN 90582 12321. Parish: Ystradfellte, Brecknockshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Castell Cae-maerdy (Unclassified).
Grid Reference: SO 03275 53016. Parish: Llanelwedd, Radnorshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Coed Maerdy (Unclassified).
Grid Reference: SS 97031 98022. Parish: Rhondda, Glamorgan
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Coed Maerdy-newydd (Unclassified).
Grid Reference: ST 04977 74974. Parish: Llancarfan, Glamorgan
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Coed y Maerdy (Unclassified).
Grid Reference: ST 16862 87308. Parish: Van, Glamorgan
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Coed Ynys-maerdy (Unclassified).
Grid Reference: ST 03243 83436. Parish: Llanharan, Glamorgan
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Coed-y-Maerdy (Unclassified).
Grid Reference: SS 97039 98030. Parish: Rhondda, Glamorgan
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Cwm-maerdy (Unclassified).
Grid Reference: SO 13650 58752. Parish: Glascwm, Radnorshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Cwm-maerdy (Unclassified).
Grid Reference: SO 13645 58661. Parish: Glascwm, Radnorshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website