"LLANWERN, a parish in the lower division of the hundred of Caldicott, county Monmouth, 4 miles E. of Newport, its post town. It is a station on the South Wales section of the Great Western railway. The wooded knolls and elevations to the right of the village are frequently capped with lias. The living is a rectory in the diocese of Llandaff, value £100. The church is dedicated to St. Mary. The principal residence is Llanwern House, the seat of the Rev. Sir C. Salusbury, Bart." [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.
Llanwern Parish; Statistics; Area 701 acres; Population 10 males, 19 females, total 29
Llanwern Parish Church Attendance - morning 60 "The congregation consists of individuals from the adjoining parishes as in the parish the Mansion House and one cottage are the only dwellings" 1 service in English Charles Salusbury, Rector, Llanwern House
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 ST371878 (Lat/Lon: 51.585529, -2.909251), Llan-wern / Llanwern which are provided by: