A total of 223,651 homes across the nation received at least one notice from lenders last month related to overdue payments, up 59.8 percent from 139,922 a year earlier, according to Irvine, Calif.-based RealtyTrac Inc.

Nearly half of the homes on the most recent list had slipped into default for the first time.

Nevada had the nation’s highest foreclosure rate, with one in every 165 households receiving at least one foreclosure-related notice. It had 6,167 properties facing foreclosure, a 68 percent increase from a year earlier and up 1 percent from January, RealtyTrac said.

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Most of the troubled properties were located in California, Florida, Texas, Michigan and Ohio — states where home prices have plunged as the housing boom went bust.

The overall U.S. foreclosure rate last month was one filing for every 557 homes.

February’s total represents a 4 percent dip from January, but the decline was just a seasonal blip, said Rick Sharga, RealtyTrac’s vice president of marketing.

“We seem to be settling in at a new plateau in terms of monthly activity, but it’s a much higher plateau than we were at a year ago,” he said.

February marked the 26th consecutive month with a national year-over-year increase in foreclosure-related filings.

Meanwhile, the number of foreclosed properties that didn’t sell at auction and ended up going back to lenders soared more than 110 percent last month versus February 2007, RealtyTrac said.

Last month, some 46,508 properties were repossessed by lenders, up from 22,114 a year earlier.

In some areas such as Riverside County, east of Los Angeles, the trend was stark.

The county has seen home values plummet since the end of the speculator-driven demand that triggered a boom in home construction, sales and prices.

In February 2007, it had only 65 homes go unsold at auction and returned to a lender. Last month, the total was 1,346.

“You look at that kind of growth and it’s just mind-numbing,” Sharga said.