Besides Parramatta, it includes Camellia, Clyde, Constitution Hill, Dundas Valley, Granville, Harris Park, Holroyd, Mays Hill, North Parramatta, Oatlands, Rosehill, Rydalmere, Telopea, Wentworthville, Westmead; and parts of Carlingford, Dundas, Ermington, Guildford, Merrylands, North Rocks, Northmead, Old Toongabbie, Pendle Hill, South Granville, South Wentworthville, and Toongabbie.

Parramatta is a diverse electorate with large immigrant communities from India and China, and has a higher than average university education rate according to the 2016 census.

[4] As originally created, it covered the outer northwestern suburbs of Sydney, though that city's dramatic growth made it an entirely urban seat after World War II.

For most of the first seven decades after Federation, it included a large amount of conservative-leaning territory that usually swamped Parramatta itself, which has historically been a working-class area.

As a result, whenever the seat is redistributed, a shift of a few kilometres to the west or east can radically alter its political landscape.

Prominent members for Parramatta over the years have included (Sir) Joseph Cook, a former Prime Minister; (Sir) Garfield Barwick and Nigel Bowen, both of whom served as Attorney-General before moving to senior judicial position, Barwick as Chief Justice of the High Court.