1955–1974: The county of Midlothian, including all the burghs situated therein, except the county of the city of Edinburgh and the burgh of Musselburgh.
1974–1983: As above.
1983–1997: Midlothian District.
1997–2005: The Midlothian District electoral wards of Bonnyrigg/Newtongrange, Dalkeith, Loanhead, and Mayfield/Gorebridge.
The 1997 reforms moved Penicuik into Tweeddale, Ettrick and Lauderdale, with the rest of the council area remaining in the seat;[2] it returned in 2005, when the constituency was expanded again to cover the entire Midlothian Council area.[3]
^Leigh Rayment's Historical List of MPs – Constituencies beginning with "M" (part 2)
^"Post from Owen Thompson". facebook.com. Owen Thompson. Retrieved 7 March 2024.
^"Former Gordon Brown adviser Kirsty McNeill to stand in Midlothian". The National. 12 February 2023. Retrieved 30 August 2023.
^"Find your local Labour MP or candidate".
^"General Election Results 2019". Electoral Reform Society Results. Electoral Reform Society. Retrieved 13 December 2019.
^"General Election: SNP reselects 54 MPs". www.scotsman.com.
^"Lee Scott back for Ilford North. Vicky Ford in final Chelmsford three. Tatton finalists named. The latest candidate selections and shortlists". Conservative Home. 24 April 2017.
^"Election Data 2015". Electoral Calculus. Archived from the original on 17 October 2015. Retrieved 17 October 2015.
^"Midlothian parliamentary constituency - Election 2017" – via www.bbc.co.uk.
^ a b"Midlothian". YourNextMP. Archived from the original on 13 February 2015. Retrieved 13 February 2015.
^"Kenny Young selected as Labour's candidate for Midlothian - LabourList". 3 March 2015.
^"Scottish Greens". Scottish Greens.
^"UK Polling Report". ukpollingreport.co.uk.
^"Election Data 2010". Electoral Calculus. Archived from the original on 26 July 2013. Retrieved 17 October 2015.