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By 1918, throughout most of Scotland, county boundaries had been altered, and detached parishes were generally historic. The Representation of the People Act 1918 took account of new local government boundaries and grouped the county of Perth with the county of Kinross for parliamentary representation purposes. Therefore, for the 1918 general election, the two counties were covered by the Perth constituency, which was now a county constituency, entirely within the county of Perth, and the Kinross and West Perthshire constituency, which covered the county of Kinross and part of the county of Perth.
Another General Election was required to take place before the end of 1915. The political parties had been making preparations for an election to take place and by July 1914, the following candidates had been selected;