"WHITSON, a parish in the lower division of Caldicott hundred, county Monmouth, 6 miles S.E. of Newport. It is situated near the Bristol Channel. The land is partly in common. The living is a vicarage* in the diocese of Llandaff value £180, in the alternate patronage of the Chapter of Llandaff and the Provost of Eton College. The church is said to have belonged to Portown, a place now swallowed up by the sea." [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 built after 1851.
Witson or Whitson Parish; Statistics; Area 1073 acres; Population 43 males, 33 females, total 76
Witson Parish Church Attendance - usual number morning 6 1 service in English B Samuel, 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 ST381834 (Lat/Lon: 51.546083, -2.894043), Whitson which are provided by: