WASHINGTON - Sales of existing homes fell in 46 states during the October-December quarter, with metropolitan areas showing growing weakness, a real estate trade group said Thursday.

The fourth-quarter data from the National Association of Realtors underscore the breadth of the housing market's slump.

South Dakota was the lone state to show a sales increase. Existing home sales there rose 8.9 percent from the same quarter a year ago. Sales were unchanged in North Dakota. No sales figures were available for Idaho, Indiana and New Hampshire.

Median home prices fell in more than half of the 150 metropolitan areas surveyed. Out of the 77 that experienced declines, 16 showed double-digit percentage drops, the trade group said. The largest price declines were found in Lansing, Mich., Sacramento, Calif. and Jackson, Miss.

Lawrence Yun, the trade group's chief economist, attributed the declines in median prices to mortgage market problems that mushroomed last fall, making loans more expensive for borrowers looking to take out "jumbo" mortgages larger than $417,000, the maximum size of mortgages that government-sponsored mortgage companies Fannie Mae and Freddie Mac can purchase and market as securities "The continuing crunch in the jumbo loan market that began in August has disproportionately reduced the number of transactions in higher price ranges," Yun said in a statement.

Source : The Associated Press