"ROCKFIELD, a parish in the lower division of Skenfreth hundred, county Monmouth, 2 miles N.W. of Monmouth, its post town, and 7 from Ragland. It is situated on the river Monnow. The Monmouthshire hounds meet in this parish. The village is small and wholly agricultural. The living is a vicarage in the diocese of Llandaff, value £50. The church is an ancient structure, dedicated to St. Kenelm. Rockfield 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.
Rockfield Parish; Statistics; Area 1993 acres; Population 153 males, 138 females, total 291
Rockfield Parish Church Attendance - afternoon 70 + 35 scholars 1 service in English Robert Chatto, A.M., Vicar
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 SO481148 (Lat/Lon: 51.829392, -2.75453), Rockfield which are provided by: