imageThe nation’s average home price fell in July from a year ago, with the S&P/Case-Shiller 20-city composite index dropping 4.1% from July 2010. (The index did increase slightly from month to month.)

Prices, the company said, are now at 2003 levels.

A bit of good news: Of the 20 cities surveyed, two saw price increases from 2010: Detroit and Washington, DC. Washington’s prices rose about three-tenths of a percent.