It's the latest sign of the billionaire's continued involvement in the race since ending his own campaign this month because of a lacklustre showing in the March 3 primaries. In those Super Tuesday contests, the former New York City mayor won only one US territory.
Bloomberg's contribution amounts to more than the national party's typical cash balance. The transfer will help the DNC make up for some steep fundraising disadvantage when compared with its Republican counterpart, which routinely has raised tens of millions more than the Democratic organisation throughout election cycles.
One of the world's wealthiest men with a net worth estimated to exceed $US60 billion, Bloomberg promised throughout his campaign that he would help Democrats try to defeat President Donald Trump regardless of how his own White House bid fared.
The Bloomberg campaign, which hired 2400 people across 43 states, will also transfer its offices in six pivotal states to the states' Democratic parties, to help accelerate their hiring and organising. Those states are Arizona, Florida, Michigan, North Carolina, Pennsylvania and Wisconsin.
Former Bloomberg campaign staffers in those offices will continue to be paid by his campaign through the first week in April and have full benefits through the end of April. After that, they could, in theory, offer the state parties a trained and ready pool of potential hires to build out their operations heading into the November general election.
Bloomberg had promised staffers when they were hired that they would be paid through November, but earlier this month most of his campaign team was told they had been let go and would be paid only through the end of March.