President Barack Obama was declared the winner of Florida, four days after the November 6 election, bringing his total of electoral votes to 332 compared to 206 for Republican challenger Mitt Romney.
Florida was the last state where the outcome was in doubt because three counties were still counting ballots.
The vote count in the only state which had not declared a result from Tuesday’s election gave Mr Obama 50% to Mr Romney’s 49.1%, according to Florida state department figures.
Mr Obama has now won 332 electoral college votes – Mr Romney has 206.
The slow count brought back memories of the bitterly contested recount in 2000.
The Democratic party in Florida had declared victory on Thursday and Republicans tacitly conceded defeat.
With the victory in Florida, Obama swept all of the battleground states, with the exception of North Carolina, which he won narrowly in 2008.
Florida was the scene of a nasty fight over ballot counting after the 2000 presidential election, when the Supreme Court ultimately ruled that George W. Bush should be awarded the states electoral votes and the presidency.
The delay in finalizing Florida’s result this year did not affect the national outcome but raised concerns that some of the problems in 2000 had not been resolved 12 years later.
The figures released by the Florida state department suggest Mr Obama won 4,236,032 votes out of a total of 8,471,095 cast – 73,858 more than Mr Romney and well above the 0.5% difference which would have triggered an automatic recount.