Penyboncyn House (Field).
Grid Reference: SJ 10872 12007. Parish: Meifod, Montgomeryshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Penyboncyn House, Buildings, Fold, Garden and Lane (Field).
Grid Reference: SJ 10534 11999. Parish: Llangyniew, Montgomeryshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Pen-y-Boncyn-Trefeilw (Unclassified).
Grid Reference: SH 96133 28293. Parish: Llanfor, Merionethshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Tan-y-boncyn (Unclassified).
Grid Reference: SJ 10330 26721. Parish: Llanrhaeadr-ym-Mochnant, Montgomeryshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website

Y Boncyn (Unclassified).
Grid Reference: SH 53235 39905. Parish: Dolbenmaen, Caernarfonshire
When recorded: 1898-1908. Primary Source: OS 2nd Edition Maps. Secondary Source: GB1900 website