High Quality Content by WIKIPEDIA articles! The A631 is a road running from Sheffield, South Yorkshire to Louth, Lincolnshire in England. It passes through the counties of South Yorkshire, Nottinghamshire and Lincolnshire. The road has many towns on its route including Rotherham, Maltby, Gainsborough and Market Rasen. It is mostly single road throughout its length but has some stretches of dual carriageway as well. The road is approximately 67 miles (108 km) long.