Erewash is an area within Derbyshire containing the Towns of Ilkeston and Long Eaton. It is bordered on the south by the River Trent and the River Derwent and to the East by the River Erewash, however the western boundaries of the region vary depending on whether one is considering the Parliamentary Constituency or the Borough of Erewash.
Erewash Liberal Democrats cover the full area of the Borough of Erewash, which includes the areas of Borrowash, and West Hallam. Ockbrook & Borrowash, Little Eaton & Stanley and West Hallam & Dale Abbey that are currently part of the Mid-Derbyshire parliamentary constuency.
A review of constituency boundaries is underway to equalise the number of electors in each constituency based on the number of voters on the electoral role as of 1 March 2020. The results of this review are due to report in 2023, before the next planned General Election. Previous proposals had included the abolition of the Mid-Derbyshire constituency with the ward of Ockbrook & Borrowash joining the Erewash parliamentary constituency, and the wards of Little Eaton & Stanley and West Hallam & Dale Abbey being added to the existing Amber Valley constituency, these plans were dropped after 2019 general election. The current plan consulted on in 2021 was to leave the constituency boundaries unchanged but rename the Erewash Constituency to Ilkeston and Long Eaton to reflect the major towns within it, and reduce confusion between the borough and the constituency.
Erewash borough is represented in Derbyshire County Council by 9 councilors elected in electoral divisions.