Republicans have 53 of 47 majorities in the upper chamber of Congress implying that the Democrats are eyeing a net gain of four seats.
Five seats, including tight battleground areas such as Georgia and North Carolina which are yet to be decided.
Democrats are also seeking to maintain their majority in the lower chamber – the House and they are currently leading in the polls.
But will many voted yet to be counted, the final results of both races might change.
This year’s congressional election is going together with the battle for the White House between incumbent Donald Trump and for vice President Joe Biden.
A Democrat-dominated House and Senate would have the power to obstruct the plans of second-term President Trump or push through first-term President Biden’s agenda.
Of the 35 Senate seats available, 23 are Republican-held while 12 are occupied by the Democrats.
US senators serve six-year terms and every two years a third of the seats are up for re-election.
By early Wednesday, Democrats had already taken one seat in the Senate meaning three seats would have to flip to their side for the party to guarantee control of the chamber.
Among the candidates for Senate, this election was a pastor, a trucker, and a football coach.
The results have proven historic with Democrats Ritchie Torres and Mondaire Jones, both in New York, being the first gay black members of Congress after being elected to the House Representatives.
One Republican candidate who won a Congress seat had previously promoted the far-right QAnon conspiracy theory, Marjorie Taylor, of Georgia, was praised as the “future Republican star” by President Trump earlier this year.
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American voters are also chopping representatives in their local state senates – and in Delaware, Democratic candidate, Sarah McBride made history as America’s first-ever trans-state senator.
The Democrats focused their campaigns on controlling the spread of Covid-19 in the US – which has the word’s highest death toll and a number of infections for much of the pandemic.
On the other side, Republicans largely focused their campaigns on economic issues.
