Chesterfield is a market town and a borough of Derbyshire, England. It lies 24 miles (39 km) 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 (9.7 km) from the M1, and forms part of the Sheffield City Region.