"MAMHILAD, a parish in the upper division of the hundred of Abergavenny, county Monmouth, 3 miles N.E. of Pontypool, its post town, and 7 from Abergavenny. The parish, which is small, is situated on the Brecon canal. The living is a perpetual curacy in the diocese of Llandaff. Mamhilad House is the principal residence." [Description(s) from The National Gazetteer of Great Britain and Ireland (1868)
Church and chapel data from The Religious census of 1851 : A Calendar of the returns relating to Wales, Vol 1, South Wales.Ed. by I.G Jones, & D. Williams. UWP, Cardiff, 1976. The names given towards the end of each entry are those of the informants. Check with Gwent RO to see what extant records are held, and possible names of chapels/churches established after 1851.
Mamhilad Parish; Statistics; Area 1987 acres; Population 147 males, 150 females, total; 297
Mamhilad Parish Church Attendance - morning 18/20, afternoon 30/40 No Sunday School 1 service in English "The incumbent refused to give any information but from enquiry I understand the attendants at the Church are as above, the parish being very small " Informant; (? illegible), Registrar
Family Search have an interactive map called "England and Wales Jurisdictions 1851" showing parish (and other) boundaries with optional background maps such as Ordnance Survey. There is also a Search facility, do read the guidance notes to get maximum benefit from this useful resource. See here for further background information to assist in the interpretation of this data
Kain, R.J.P., Oliver, R.R., Historic Parishes of England and Wales: an Electronic Map of Boundaries before 1850 with a Gazetteer and Metadata [computer file]. Colchester, Essex: History Data Service, UK Data Archive [distributor], 17 May 2001. SN: 4348. Here is a gazetteer/finding aid plus a set of overview maps to accurately identify the position of parishes within the county.
You can see maps centred on OS grid reference SO304034 (Lat/Lon: 51.724981, -3.00905), Mamheilad / Mamhilad which are provided by: