Editor's Note: This item is republished with permission from Inman News. View the original article, "Price gains lift 400,000 homes above water."

Home price increases helped more homeowners regain some equity in their homes during the second quarter, according to an analysis by Zillow.

Zillow's Negative Equity Report estimates that 30.9% of homeowners with mortgages owed more than their homes were worth at the end of June, down from 31.4% at the end of March. That translates into 15.3 million underwater homes—about 400,000 less than three months before.

The report—which compares Zillow's automated home valuation "Zestimates" for individual homes with actual mortgage loan balance data from TransUnion—showed all but one of the 30 largest markets tracked by Zillow saw a quarter-over-quarter improvement in their negative equity rate.

Metro areas seeing the greatest quarter-to-quarter percentage point decreases in the negative equity rate were Phoenix (-3.9 percentage points, to 51.6%), Miami-Fort Lauderdale, Fla. (-2.7 percentage points, to 43.7%) and Las Vegas (-2.5 percentage points, to 68.5%).

Among those 30 markets, only Philadelphia experienced an increase in its negative equity rate, which was up 0.4 percentage points from March to June. But the city's 25.4% negative equity rate was still well below the national average. Charlotte, N.C. (-0.2 percentage point, to 36.4%) and St. Louis (-0.5 percentage point, to 30.2%) also failed to best the 0.5 percentage point improvement in the negative equity rate seen at the national level.

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Learn more about markets featured in this article: Phoenix, AZ, Miami, FL, Las Vegas, NV, Philadelphia, PA, Charlotte, NC, St. Louis, MO.