The world's largest economy grew at an annualised rate of 3.2% in the three months to September, up from an earlier estimate of 2.9%.
The figure outstrips the second quarter growth rate of 1.4%, and was above economists' estimates of 3% growth.
The Commerce Department said the rate of growth was the strongest since the third quarter of 2014.
The strong growth may give further impetus to the Federal Reserve to raise US interest rates when it meets in the middle of next month.
A strong employment rate and steadily rising inflation may mean the the central bank is comfortable raising rates at the meeting on 13 and 14 December.
The Fed hiked its overnight benchmark interest rate last December for the first time in nearly a decade.
The GDP figure is a measure of the goods and services produced across the US economy.
The Commerce Department said: "The increase in real GDP in the third quarter primarily reflected positive contributions from personal consumption expenditures, exports, private inventory investment, and federal government spending, that were partly offset by negative contributions from residential fixed investment and state and local government spending."
It said consumer spending, which accounts for more than two-thirds of the US economy increased at a rate of 2.8%, compared with the initial estimate of 2.1%.
But business spending on equipment fell at a steeper 4.8% rate, instead of the previously reported 2.7%.

The UN says the arms were part of legitimate consignment for its mission in the Democratic Republic of Congo.
Drugs tests carried out on a substance found around some of the UN vehicles were negative, the police said.
The vehicles were allowed to be reloaded on board before the ship left, but the police have retained the arms.
The rifles and rocket-propelled grenades, which were among the weapons found inside the UN vehicles, would be delivered under Kenyan escort to Indian peacekeepers in DR Congo, Mombasa County police commander Francis Wanjohi said.
He said it would be too dangerous for the MV Hoegh Transporter to continue its journey if it was common knowledge there were weapons aboard, because of the threat of piracy.
The ship had been sailing from Mumbai in India, but its final destination is unknown.
The BBC's Ferdinand Omondi in Mombasa says the dramatic midnight raid on the vessel after it had docked on Thursday night involved several elite Kenya police units, including the narcotics squad and the criminal investigation department.
The whole port was shut down and people asked to leave as it searched the ship, he says.
The UN's Nairobi office said the misunderstanding over the weapons, often stored in vehicles for to avoid damage in transit, was down to a clerical error.
It said although the weapons were not declared in the manifest, a separate declaration accompanying the military vehicles was attached.
A UN spokesman further explained new vehicles often had anti-humidity powder put around tyres for long shipments.
Hoegh Autoliners, the owners of the ship, were contemplating suing the state for damages and defamation, a lawyer representing them in Kenya, said.
"The hullabaloo was so much ado about nothing," Cliff Ombeta told Kenya's Star newspaper.
UN's mission in DR Congo is one of the organisation's biggest peacekeeping operations, with nearly 20,000 personnel.

He was injured in a tumble from Cernunnos, for his boss JP McManus, at the final fence in the Summer Plate Handicap Chase won by Long House Hall.
Geraghty, 36, will see a specialist to determine whether he needs surgery.
"He'll be out for two to three months with that," said Irish Turf Club senior medical officer Dr Adrian McGoldrick.
The first big meeting in Ireland that Geraghty will miss will be the seven-day Galway meeting, which starts on 25 July.
Strong consumer spending helped the US economy to grow faster than previously estimated in the third quarter.
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A Norwegian ship detained in Kenya's Mombasa port for more than a week on suspicion of carrying drugs and illegal weapons has been released.
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Jockey Barry Geraghty will miss the Galway Festival and is out for at least two months after breaking his right arm in a fall at Market Rasen.