2009 foreclosures up 21%

Half of foreclosures concentrated in 4 states

The number of properties hit with foreclosure-related filings in 2009 climbed 21 percent from the year before, to 2.82 million, data aggregator and foreclosure property search site RealtyTrac said Thursday.

The number of foreclosure-related filings was up 120 percent from 2007, and would likely have been higher if not for delays in processing delinquent loans, said RealtyTrac CEO James Saccacio.