A measure of U.S. home prices rose 6.3% in October compared with a year ago - for the largest yearly gain since July 2006.

The jump adds to signs of a comeback in the once-battered U.S. housing market, but the news isn't all good for Illinois.

The report indicates home values increased in 45 states in October - with the biggest increase in Arizona, where prices rose 21.3%. The five states where prices declined were: Illinois, Delaware, Rhode Island, New Jersey, and Alabama.

Core Logic today also said prices declined 0.2% in October from September, the second drop after six straight monthly increases. The real estate data provider says the decline reflects the end of the summer home-buying season.