Killamarsh is a town and civil parish in North East Derbyshire, England, bordering Sheffield and South Yorkshire to the North West. Killamarsh is surrounded by, in a clockwise meting out from the north, Rother Valley Country Park, Wales, Kiveton, Woodall, Harthill, Barlborough, Spinkhill, Renishaw, Eckington, and the (former Derbyshire) Sheffield suburbs of Oxclose, Halfway and Holbrook. Over the years, Sheffield and South Yorkshire have tried to mingle the town into the ceremonial county as portion of the city, but disagreements have prevented this, though Killamarsh does have a Sheffield dialling code, address and postcode.
Killamarsh was mentioned in the Domesday Book when the post Chinewoldemaresc or Chinewolde meaning “Cynewalds Marsh”. There are a number of smaller communities within the town; Norwood, Nethergreen, Westthorpe and Upperthorpe surround the main town centre.