Chesterfield is a large market town and unparished area in the Borough of Chesterfield in Derbyshire, England, 24 miles north of Derby and 11 miles south of Sheffield at the confluence of the River Rother and River Hipper. In 2011 the built-up-area subdivision had a population of 88,483, making it Derbyshire's second largest settlement after Derby. Its borough, including Whittington, Brimington and Staveley, had a population of 103,801 in 2011. In 2011 the unparished area had a population of 76,753. It has been traced to a transitory Roman fort of the 1st century CE. The name of the later Anglo-Saxon village comes from the Old English ceaster and feld. It has a sizeable street market three days a week. The town sits on an old coalfield, but little visual evidence of mining remains. Its main landmark is the crooked spire of the Church of St Mary and All Saints.