WASHINGTON — U.S. home prices rose at the fastest pace in 31 months in February, according to the S&P/Case-Shiller Home Price Index report, although price gains in D.C. still trail other big cities. [related_gallery align=”right”]

The monthly report says prices in the 20 largest cities averaged year-over-year gains of 5.9 percent.

In D.C., the annual gain, as of February, was 4.1 percent — smaller only in New York, where prices were up 3.2 percent.

The report says prices in Seattle in February were up a staggering 12.2 percent from a year ago, by far the largest annual gain among big cities.

Prices in Portland, Oregon, were up 9.7 percent. Dallas bumped Denver from the top three for price gains in February. Prices in Dallas were up 8.8 percent.

Below are the month-over-month and annual price gains in the 20 largest markets, and the national average, from the S&P/Case-Shiller Home Price Index.