Epsom is based around central and eastern Auckland isthmus. It contains the suburbs of Parnell, Remuera, Mount Eden, Newmarket, half of Greenlane and the eponymous suburb of Epsom. In the 2025 boundary review the East Coast Bays electorate shifted westward. Epsom has been an important electorate in New Zealand politics as, since 2005, it has allowed the ACT Party to gain seats in parliament without meeting the five percent party vote threshold as the party leaders David Seymour, John Banks and Rodney Hide have each won the electorate.