Homes that are underwater — mortgaged for more than they’re worth — represent a much smaller fraction of the housing market than they did a few years ago, according to a new report from RealtyTrac, a real estate data company. However, some parts of the country are doing much better than others.

The national average, at 13.3 percent, isn’t all the way back to normal, but it would sound awfully good to places like Tampa, Cleveland, Las Vegas — or Chicago, where almost a quarter of mortgages are still underwater.

Percentage of homes seriously underwater based on county (Data courtesy RealtyTrac)

“What’s happening on the Gold Coast in Chicago — which is very expensive — has very little to do with what’s happening in traditionally disadvantaged areas on the South or the West Side of the city,” says Spencer Cowan, senior vice president for research at the Woodstock Institute, a local think-tank focused on economic equity.

Eight ZIP codes on Chicago’s South and West Sides have underwater rates above 50 percent — more than three times the rate for the Gold Coast area.