Until its abolition, Murrumbidgee and Parramatta were the only electorates to have existed continuously since the first Legislative Assembly election in 1856, although before 1913 it was called The Murrumbidgee. It elected two members between 1856 and 1859, one member between 1859 and 1880, two members between 1880 and 1885, three members between 1885 and 1894 and one member between 1894 and 1920. Voters cast a vote for each vacancy. Between 1920 and 1927, it absorbed parts of Lachlan and Ashburnham and elected three members under proportional representation. From 1927 until its abolition at the 2015 election, it elected one member.