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One of Maryland's largest and most prosperous counties, Montgomery County stretches from densely populated suburbs at the District of Columbia line to rural agricultural areas near Frederick County. The county was named after Revolutionary War General Richard Montgomery. The county seat is Rockville, and principal towns also include Gaithersburg, Wheaton, and Bethesda. The major highways in the county are the Capital Beltway (I-495) and I-270, which is the main route to Frederick and points west. Interstate 270 parallels Md. Route 355, an historic route west from Washington. Montgomery County is bounded by the Frederick County to the north, the Patuxent River (Howard County), Prince George's County, and the District of Columbia to the east, and the Potomac River to the south and west.