Portland is a city located in the Northwestern United States, near the confluence of the Willamette and Columbia rivers in the state of Oregon. As of the 2010 Census, it had an estimated population of 583,776,Portland was incorporated in 1851 and is the county seat of Multnomah County. The city extends west into the Cedar Mill neighborhood in Washington County and south towards Lake Oswego in Clackamas County. It is governed by a commission-based government headed by a mayor and four other commissioners.Portland has been referred to as one of the most environmentally friendly or "green" cities in the world. and investment in light rail, supported by Metro, a distinctive regional government. Portland is known for its large number of microbreweries and microdistilleries, as well as its coffee enthusiasm. It is also the home of the Trail Blazers NBA team and the Timbers MLS team.Portland lies in the Marine west coast climate region, marked by warm, dry summers and rainy but mild winters. This climate is ideal for growing roses, and for more than a century, Portland has been known as "The City of Roses" with many rose gardens—most prominently the International Rose Test Garden.