Washington ? Sales of existing homes increased unexpectedly in February after six months of decline, but private economists said it was too soon to say whether the prolonged slide in housing is coming to an end.

The National Association of Realtors said sales of existing homes rose by 2.9 percent in February to a seasonally adjusted annual rate of 5.03 million units. It marked the first sales increase since last July, but even with the gain sales were still 23.8 percent below where they were a year ago.

By region of the country, sales surged by 11.3 percent in the Northeast and were up 2.5 percent in the Midwest and 2.1 percent in the South. The only region of the country to see a sales decline was the West, where sales dropped by 1.1 percent.

Prices continued to slide. The median sales price for single-family homes and condominiums dropped to $195,900, a fall of 8.2 percent from a year ago, the biggest slide in the current housing slump. The median price for just single-family homes was down 8.7 percent from a year ago, the biggest decline in four decades.

Economists said they still believed any sustained housing rebound was many months away.

“The hemorrhaging has stopped but the recovery will be long, slow and painful,” said Bernard Baumohl, managing director of the Economic Outlook Group. “It’s unlikely that we will see any sustained jump in home purchases, must less higher prices, until mid-2009 at the earliest.”

A report released Tuesday showed home prices plunged by record levels in January from a year ago, with almost no major cities immune from the spiraling market.

The closely watched Standard & Poor’s/Case-Shiller index of home prices in 20 cities fell nearly 11 percent in January from a year earlier, the biggest drop in its two-decade history.

Prices were down about 20 percent in Las Vegas and Miami, both paying the price for especially rampant speculation and too much new construction during the housing boom. Fourteen other cities posted record declines in the Tuesday report.

The only bright spot was a 1.8 percent increase in Charlotte, N.C., where real estate agents say prices rose more modestly during the boom years and the regional economy is relatively strong.