The East Midlands is one of nine official regions of England at the first level of NUTS for statistical purposes. It consists of Derbyshire, Leicestershire, Lincolnshire, Northamptonshire, Nottinghamshire and Rutland. The region has an area of 15,627 km2 (6,034 sq mi), with a population over 4.5 million in 2011. There are six main urban centres, Derby, Leicester, Lincoln, Mansfield, Northampton and Nottingham. Others include Boston, Chesterfield, Corby, Grantham, Hinckley, Kettering, Loughborough, Newark-on-Trent, Skegness, and Wellingborough.