The revisions indicate greater momentum going into the second half of 2017, as well as showing that growth in GDP - the value of all goods and services produced - may be broadening beyond household spending.
The second quarter growth in 2017 of 3 percent, which includes performance from April, May, and July, more than double the 1.2 percent growth seen in the first quarter of 2017.
Paul Ashworth, chief US economist at Capital Economics, said he believed that the strength in consumer spending should result in an "even stronger hand-off" for growth going into the current quarter. Real GDP increased at an annualized rate of 3.0% in the second quarter of 2017. Likewise, the contribution from nonresidential fixed investment improved from 0.64 to 0.85 percentage points to real GDP growth for the quarter.
Consumer spending, biggest part of the economy, grew 3.3 percent (estimated 3 percent), most since second quarter of 2016 and revised from 2.8 percent.
The Department of Commerce will issue its third estimate for the second quarter September 28.
Ahead of Friday's publication of the monthly employment report and non-farm payrolls data, the ADP report on private payrolls showed that 237,000 jobs were added in August.More news: 2012 champ Andy Murray pulls out of US Open with hip injury
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The chief driver of second-quarter strength was consumer spending.
Economists are also estimating how Hurricane Harvey could affect third-quarter growth. Of the almost 200 countries whose economies are tracked by the International Monetary Fund, just seven saw real, inflation-adjusted gross domestic product rise by 7 percent or more a year ago.
The economy picked up from a 1.2% rate in the first quarter. The revised number was 3.3 percent, versus an initial estimate of 1.9 percent.
The growth is "impressive given the lack of policy reforms out of Washington D.C.", said Joseph Brusuelas, chief economist at RSM, a tax and consulting firm.
Even though the pace of growth is in line with the Trump administration's long-term goal of 3 percent, many analysts don't expect that rate to be maintained in the coming years or even in the coming months. The most encouraging news was the strong spending by businesses, which has been lacking for much of the recovery but may finally be turning around.
"Underlying domestic demand in the economy is consistent with near three percent growth but the supply-side of the economy is not capable of delivering such a pace of growth at this point", John Ryding, chief economist at RDQ Economics in NY, told CNBC.