South Northamptonshire is a mainly rural and sparsely populated seat, but includes the wards of East and West Hunsbury and Nene Valley from Northampton Borough.. The largest towns are Brackley and Towcester, both traditional market towns. Towcester, the administrative centre for South Northamptonshire council, is best known for its racecourse and the seat also contains part of Silverstone racecourse, which abuts the Northamptonshire/Buckinghamshire border and provides a centre for high tech industry (two F1 teams have their bases within the constituency) including computing and micro technology companies.
To the south the constituency stretches close to the outskirts of Milton Keynes, taking in nearby villages like Old Stratford and Cosgrove, while to the north it includes villages like Wootton and Hardingstone.
The electoral wards used in the creation of this new seat are as follows.
The seat wwas fought for the first time at the 2010 election by a slate of candidates who are all new to the constituency as candidates, with only the Liberal Democrat candidate, Cllr Scott Collins, having grown up in the constituency and lived there for 34 years up until 2004. The seat was won by Conservative Andrea Leadsom.