Thanks to improving home prices, fewer mortgage borrowers owe more on their homes than they are worth. More than 700,000 homeowners were no longer underwater on their homes during the first quarter, according to CoreLogic. According to the report, 11.4 million -- or 23.7% -- of mortgage borrowers were underwater on their homes at the end of March. That's down from the 12.1 million, or 25.2%, of borrowers who were underwater three months earlier. "This is a meaningful improvement that is driven by quickly improving outlooks in some of the hardest hit markets," said Mark Fleming, CoreLogic's chief economist.Home price rebounds, a better balance of supply and demand and fewer distressed sales all helped to reduce the number of people who were underwater during the quarter, he said. Another 1.9 million homeowners were only 5% underwater on their homes during the quarter, suggesting that if home prices continue to climb, they too can soon breathe a sigh of relief.