The state of Oklahoma has 48 state Senate districts. Each district elects one senator. There are 24 Senate seats up for election in 2020 with a primary to be held on June 30, a runoff (if necessary) on August 25 and the general election on November 3.The Oklahoma Senate is the upper chamber of the Oklahoma State Legislature. Together with the Oklahoma House of Representatives, they form a legislative branch of the Oklahoma state government and work directly with the governor of Oklahoma to create laws and establish a state budget. The Oklahoma Senate’s authority includes legislation on public policy matters, setting levels for state spending, raising and lowering taxes, and voting to uphold or override gubernatorial vetoes.Oklahoma state Senators serve four-year terms and are limited to a total of 12 years of cumulative service in the House and Senate. They are scheduled to receive a pay increase in November 2020, from $35,021 to $47,500 annually. When the legislature is in session, they also receive a $156 daily "per diem" allowance.Members of the Senate must be twenty-five years of age at the time of their election. They must be qualified electors in their respective counties or districts and must live in those counties or districts during their term of office.