Democrats took control of the Senate after Jon Ossoff and Raphael Warnock defeated Republicans David Perdue and Kelly Loeffler by razor-thin margins.
The victories were overshadowed by riots in Washington DC as a mob of Trump supporters stormed the US Capitol in an effort to stop the count of the Electoral College votes declaring Joe Biden as president elect.
The chaos spread to Georgia as governor Brian Kemp and secretary of state Brad Raffensperger were reportedly evacuated after a 'militia' gathered outside the state Capitol.
Watch: Democrats take the Senate with Georgia wins
Mr Ossoff, 33, becomes the youngest man to enter the Senate since president-elect Joe Biden did so himself in 1973 while Reverend Warnock becomes the state’s first black senator and only the second black senator elected to represent a former Confederate state.
Their wins mean that both parties have 50 senators each, leaving the deciding vote in legislative matters with vice president-elect Kamala Harris and seeing Mitch McConnell deposed as majority leader.
Watch: Trump, Biden rally in Georgia ahead of runoffs