The Representation Act 1900 had increased the membership of the House of Representatives from general electorates 70 to 76, and this was implemented through the 1902 electoral redistribution. In 1902, changes to the country quota affected the three-member electorates in the four main centres. The tolerance between electorates was increased to ±1,250 so that the Representation Commissions (since 1896, there had been separate commissions for the North and South Islands) could take greater account of communities of interest. These changes proved very disruptive to existing boundaries, and six electorates were established for the first time, and two electorates that previously existed were re-established, including Mount Ida.
Mount Ida was a rural electorate in Central Otago. It is based on Naseby and uses its prior name. In the 1905 election, polling booths were in Naseby, Livingstone, Waipiata, Island Cliff, Duntroon, Rough Ridge, Gimmerburn, Kurow, Lauder Railway, Cambrian's, Omarama, Tokarahi, Georgetown, Wedderburn, Upper Kyeburn, Blackstone Hill, St Bathans, Maerewhenua, Ophir, Ida Valley, Ranfurly, Wharekuri, Ngapara, and H?wea Flat.
The electorate was first formed for the 1871 election.David Mervyn was the first representative. He served until the end of the parliamentary term in 1875. Mervyn was succeeded by Cecil de Lautour, who won the 1876 election and served until 1884. The next representative was Scobie Mackenzie, who was elected in 1884 and served three terms until 1893.
Alexander Herdman was the representative for the term starting with the 1902 election. Herdman was succeeded by John Andrew MacPherson in the 1905 election and served until the abolition of the electorate in 1908.
The electorate was represented by five Members of Parliament:
|1871 election||David Mervyn|
|1876 election||Cecil de Lautour|
|1884 election||Scobie Mackenzie|
|(Electorate abolished 1893-1902)|
|1902 election||Alexander Herdman|
|1905 election||John MacPherson|
|(Electorate abolished 1908)|