Enter Surname and select County. Click Search.
If unsure of Surname spelling click Soundex or else just enter part of Surname (at least 3 letters) and Click 'Part of Name'. Full parish or townland name or any 'part of' can be entered if you wish to narrow search.
After pressing Search allow 1-2 minutes for results particularly if searching for common surname throughout all parishes in county.Use scrollbar if large number of results returned.

Surname	Exact Sounds Like Part of Name
Forename	Full forename OR any part of (e.g. Jo will return all forenames containing jo John Johanna Joan etc) Leave blank if you wish.
Parish	Full parish name OR any part of (e.g. kil will return surnames in all parishes containing letters kil) Leave blank if you wish.
Townland	Full townland name OR any part of (e.g. kil will return surnames in all townlands containing letters kil) Leave blank if you wish.
County	Select County Antrim Armagh Carlow Cavan Clare Derry Donegal Down Dublin Cork Fermanagh Galway Kerry Kildare Kilkenny Laois Leitrim Limerick Longford Louth Mayo Meath Monaghan Tipperary Offaly Roscommon Sligo Tyrone Waterford Westmeath Wexford Wicklow You MUST Select a County

Data from http://www.failteromhat.com/. Please check actual Griffiths Valuation records at your nearest research center to verify against original data.