Papcastle is a village and civil parish in the district of Cumberland in the English county of Cumbria. The village is now effectively a northern extension of Cockermouth, which lies to the south of the River Derwent. It has its own parish council and lies within Bridekirk Parish for Church of England purposes. In 2001 it had a population of 406, reducing to 38…Papcastle is a village and civil parish in the district of Cumberland in the English county of Cumbria. The village is now effectively a northern extension of Cockermouth, which lies to the south of the River Derwent. It has its own parish council and lies within Bridekirk Parish for Church of England purposes. In 2001 it had a population of 406, reducing to 385 at the 2011 Census.