The county franchise, from 1430, was held by the adult male owners of freehold land valued at 40 shillings or more. Each elector had as many votes as there were seats to be filled. Votes had to be cast by a spoken declaration, in public, at the hustings, which took place in Nottingham. The expense and difficulty of voting at only one location in the county, together with the lack of a secret ballot contributed to the corruption and intimidation of electors, which was widespread in the unreformed British political system.

The expense, to candidates and their supporters, of contested elections encouraged the leading families of the county to agree on the candidates to be returned unopposed whenever possible. Contested county elections were therefore unusual. Three families; the Duke of Newcastle, the Duke of Portland and the Pierreponts, all Whigs, dominated the county until well into the 19th century, which was why there was no contest after 1722.

The bloc vote electoral system was used in two seat elections and first past the post for single member by-elections. Each voter had up to as many votes as there were seats to be filled. Votes had to be cast by a spoken declaration, in public, at the hustings.

Note on percentage change calculations: Where there was only one candidate of a party in successive elections, for the same number of seats, change is calculated on the party percentage vote. Where there was more than one candidate, in one or both successive elections for the same number of seats, then change is calculated on the individual percentage vote.

Note on sources: The information for the election results given below is taken from Stooks Smith 1715–1754, Namier and Brooke 1754–1790 and Stooks Smith 1790–1832.

• List of former United Kingdom Parliament constituencies
• Unreformed House of Commons

• British Parliamentary Election Results 1832–1885, compiled and edited by F.W.S. Craig (Macmillan Press 1977)
• The House of Commons 1754–1790, by Sir Lewis Namier and John Brooke (HMSO 1964)
• The Parliaments of England by Henry Stooks Smith (1st edition published in three volumes 1844–50), second edition edited (in one volume) by F.W.S. Craig (Political Reference Publications 1973)) out of copyright
• Robert Beatson, A Chronological Register of Both Houses of Parliament (London: Longman, Hurst, Res & Orme, 1807)
• D Brunton & D H Pennington, Members of the Long Parliament (London: George Allen & Unwin, 1954)
• Cobbett's Parliamentary history of England, from the Norman Conquest in 1066 to the year 1803 (London: Thomas Hansard, 1808)
• J E Neale, The Elizabethan House of Commons (London: Jonathan Cape, 1949)
• Leigh Rayment's Historical List of MPs – Constituencies beginning with "N" (part 3)