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Sales of both new construction and existing homes are on pace to for their best year since 2007, and the accompanying purchase mortgage activity needed to facilitate this year's transactions is now forecasted to jump 25% from last year, to $801 billion.

From sun-soaked Phoenix to the frosty Twin Cities, here's a look at the 10 markets with the biggest year-over-year percent increases in home sales. The data, from RealtyTrac, is based on metropolitan statistical areas with more than 10,000 home sales in the first half of 2015.
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No. 10: Phoenix-Mesa-Scottsdale, Ariz.

1H15 Home Sales: 47,869 (+11.92%)
June 2015 Average Sales Price: $232,979
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No. 9: Orlando-Kissimmee, Fla.

1H15 Home Sales: 16,955 (+14.65%)
June 2015 Average Sales Price: $190,270
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No. 8: Columbus, Ohio

1H15 Home Sales: 14,190 (+15.28)
June 2015 Average Sales Price: $199,202
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No. 7: Nashville-Davidson-Murfreesboro-Franklin, Tenn.

1H15 Home Sales 15,421 (+17.41%)
June 2015 Average Sales Price: $238,932
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No. 6: San Antonio, Texas

1H15 Home Sales: 10,017 (+17.82%)
June 2015 Average Sales Price: $242,588 (Source: San Antonio Board of Realtors)
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No. 5: Tampa-St. Petersburg-Clearwater, Fla.

1H15 Home Sales: 26,352 (+18.64%)
June 2015 Average Sales Price $161,379
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No. 4: Charlotte-Gastonia-Concord, N.C.-S.C.

1H15 Home Sales: 15,920 (+20.46%)
June 2015 Average Sales Price: $213,995
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No. 3: Seattle-Tacoma-Bellevue, Wash.

1H15 Home Sales: 26,016 (+21%)
June 2015 Average Sales Price: $419,614
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No. 2: Portland-Vancouver-Beaverton, Ore.-Wash.

1H15 Home Sales: 25,034 (+21.68%)
Average home price in June: $339,482
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No. 1: Minneapolis-St. Paul-Bloomington, Minn.-Wis.

1H15 Home Sales: 22,052 (+24.74%)
June 2015 Average Sales Price: $245,879
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