Sprint on Monday rolled out its 4G service in a handful of new markets, including Los Angeles, Miami, Washington D.C., Cleveland, Cincinnati, and Columbus, Ohio. That brings the total count to 68 markets across the country, with plans to launch 4G service in San Francisco on December 28, 2010.

“We have witnessed a great demand from our customers for 4G speeds, power, and capabilities in these cities already and today they officially have it,” said Matt Carter, president, Sprint 4G. “We are proud to deliver on our commitment to serve our customers and deliver 4G to more major metropolitan areas in 2010.”

Sprint’s 4G service (6Mbps) offers up to 10 times faster Web browsing compared to 3G (600kbps – 1.7Mbps), which comes as a boon for things like streaming video and music.