"It would not be a huge surprise to see the numbers level off a little bit at this point," said Rick Sharga, RealtyTrac's senior vice president for marketing.

Banks repossessed about 65,000 homes in May, up from 64,000 in April, due to big increases in several states including Michigan, Arizona and Nevada.

The Obama administration announced a plan in March to provide $50 billion from the financial industry rescue fund as an incentive for the mortgage industry to modify loans at lower monthly payments.

But the effectiveness of the relief plan remains unclear, with questions lingering about how much the lending industry will cooperate. Many housing counselors say it hasn't made much of a difference so far.

After banks take over foreclosed homes, they usually put them up for sale at deep discounts, pulling down prices for other sellers. Nationwide, sales of foreclosures and other distressed properties made up about 45 percent of the market in April, according to the National Association of Realtors.

The supply of new foreclosures had diminished in recent months as banks held off on taking back properties, but it's starting to surge again, said Gary Kent, a San Diego real estate broker who focuses on the foreclosure market.

"Everything I've got that's priced right is just flying off the shelves," he said.

On a state-by-state basis, Nevada had the nation's highest foreclosure rate in May with one every 64 households receiving a filing. California took the No. 2 slot previously occupied by Florida. California's rate was one in every 144 households.

In Florida, one in every 148 households received a foreclosure filing. Rounding out the top 10 were Arizona, Utah, Michigan, Georgia, Colorado, Idaho and Ohio.

Among large cities, Las Vegas led the way with one in every 54 households receiving a filing.