At the time of Griffith's Valuation John William Owen Richards had an estate in the parish of Kilmore, barony of Erris, county Mayo. This property was previously held on a lease for ever from Sir Arthur Shaen to the Everards. In 1876 Richards owned 2228 acres in county Mayo and 3219 acres at Tempo, county Fermanagh.
Contemporary printed sources
- ''GRIFFITH'S VALUATION OF IRELAND'[Primary Valuation of Tenements]', 1850-1858. : Belmullet Union, 77
- HUSSEY DE BURGH, U. H. ''The Landowners of Ireland. An alphabetical list of the owners of estates of 500 acres or £500 valuation and upwards in Ireland''. Dublin: Hodges, Foster and Figgis, 1878. [available online at www.askaboutireland.ie] : 387
- PARLIAMENTARY PAPERS. ''Return of owners of land of one acre and upwards, in the several counties .... in Ireland''. HC 1876, LXXX: 312