Horncastle is a market town and civil parish in the East Lindsey district in Lincolnshire, England. It is 17 miles east of Lincoln. Its population wa…Horncastle is a market town and civil parish in the East Lindsey district in Lincolnshire, England. It is 17 miles east of Lincoln. Its population was 6,815 at the 2011 census and estimated at 7,123 in 2019. A section of the ancient Roman walls remains.
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