The electoral district of Cootamundra covers some 34,711 km² stretching from Cowra in the north to Gundagai in the south, and from Harden in the east to West Wyalong and Narrandera in the west. It is surrounded by the larger regional centres of Orange, Wagga Wagga, Canberra and Griffith.
The electorate of Cootamundra has around 52,000 people enrolled to vote and consists of the local government areas of Hilltops Council, Cowra Shire Council, Weddin Shire Council, Cootamundra–Gundagai Regional Council, Bland Shire Council, Temora Shire Council, Coolamon Shire Council, Narrandera Shire Council and Junee Shire Council.
Land use within the electorate is primarily agricultural with mixed farming predominating in the east trending to cropping towards the west. There are some areas of light industry in the larger towns, mining in the west and some forestry areas to the south.
Katrina was first elected to Parliament as the Member for Burrinjuck at the March 1999 State Election. She was re-elected in the 2003 and 2007 State Elections, each time with an increasing margin. Following a redistribution of NSW electorates in 2006, Katrina was returned comfortably at the March 2007 election, achieving 64.7% of the first preference votes and a two-party preferred vote of 67.33%. In the 2011 election, Katrina was once again returned, with a very strong margin of around 80 per cent of the Two Party Preferred vote.
The NSW State electoral divisions changed significantly at the State Election on Saturday, 28 March 2015 and the new Cootamundra electorate came into existence. Katrina contested the new seat of Cootamundra, and was returned as a Member of Parliament, this time as the Member for Cootamundra, with almost two thirds of the Two Candidate Preferred vote.