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Castletown is a small village of Sunderland in Tyne and Wear. A former mining community, the Hylton Colliery was located at the east end of the village; it lies north of the River Wear, and is near to Hylton Castle and Washington. At Hylton Riverside, on the eastern fringe of Castletown, there is a large retail park .
There is a large-scale redevelopment project, aimed at modernising the former pit houses and the area around the Aviary Estate. Since 2011 there have been further developments in the east part of the village. The Aviary area has been completely demolished and a new housing estate has replaced both sides of the main street. This site was re-developed by the Gentoo Group.
At the opposite end of Castletown is the newer development of Fulford Grange.
Currently, the records state that Castletown is the least ethnically diverse area in Sunderland, with 99.3% of the population being white.
Despite its proximity to Sunderland, until 1967 this colliery village was under the administrative control of Durham County Council and was part of the Sunderland Rural District Council. This was because it was a fairly isolated community until the extensive council house building of the fifties and sixties at the Red House, Hylton Castle and Town end Farm Estates effectively joining the settlement to the rest of Sunderland's new northern suburbs.
The New Wear Bridge joining Castletown to Pallion is under construction. The bridge was originally going to be named after local hero Lynn Hardy, however was petitioned against it due to the passing of Bradley Lowery.
During the search for the Yorkshire Ripper, the accent of "Wearside Jack", the author of a hoax letter claiming to be from the Ripper, was identified by the forensic linguist Stanley Ellis as that of the Castletown area. The hoaxer was eventually revealed to have come from nearby Pennywell.
- Windsor Lewis, Jack (13 November 2009). "Stanley Ellis obituary". The Guardian. Retrieved 22 November 2017.