[Avon] Rhyd yr Onnen (Topographic feature).
Grid Reference: SJ 15651 72424. Parish: Ysceifiog, Flintshire
When recorded: 1699. Primary Source: Parochialia 1. Secondary Source: none

Allt onnen fawr (Field).
Grid Reference: SN 59531 26990. Parish: Llandeilo Rural, Carmarthenshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Bryn Onnen (Field).
Grid Reference: SJ 04204 28725. Parish: Llangynog, Montgomeryshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Bryn Onnen House &c (Field).
Grid Reference: SJ 12670 26336. Parish: Llanrhaeadr-ym-Mochnant, Denbighshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Bryn Onnen House &c (Field).
Grid Reference: SJ 12670 26336. Parish: Llanrhaeadr-ym-Mochnant, Denbighshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Brynyronnen (Field).
Grid Reference: SJ 07510 57489. Parish: Cyffylliog, Denbighshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Cae bach Dolronnen (Field).
Grid Reference: SH 90546 02371. Parish: Llanbrynmair, Montgomeryshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Cae bach onnen (Field).
Grid Reference: SN 65984 19600. Parish: Llandeilo Rural, Carmarthenshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Cae Bryn Onnen (Field).
Grid Reference: SJ 12621 26443. Parish: Llanrhaeadr-ym-Mochnant, Denbighshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin

Cae Bryn Onnen (Field).
Grid Reference: SJ 12621 26443. Parish: Llanrhaeadr-ym-Mochnant, Denbighshire
When recorded: 1841. Primary Source: none. Secondary Source: Cynefin