BOSTON (AP) — The number of single-family homes sold in Massachusetts last month jumped to the highest January level since 2007.

Two organizations that track the market also reported Tuesday that median prices jumped by double-digit percentage points when compared to January 2013.

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The Warren Group, a Boston-based publisher of real estate data, reported a 5 percent jump in sales year-over-year and a nearly 13 percent rise in the median price to $315,000.

The Waltham-based Massachusetts Association of Realtors reported a more modest sales increase of just less than 1 percent. A more than 14 percent increase in median prices to $320,000 made it 16 consecutive months of increases.

The organizations use slightly different numbers in their calculations.

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Realtors President Peter Ruffini said prices are being driven by buyer demand and low inventory.

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