Chesterfield is a market town and a borough of Derbyshire, England. It lies 24 miles north of Derby, on a confluence of the rivers Rother and Hipper. Its population is 103,800 (2011), making it Derbyshire’s largest town (the larger Derby being a city). It is located on the A61, 6 miles from the M1, and forms part of the Sheffield City Region. Chesterfield received its market charter in 1204. It has the largest open air markets in Britain.