Portland is a city located near the confluence of the Willamette and Columbia rivers in the U.S. state of Oregon. With an estimated population of 568,380, it has been called the greenest city in the United States, and second greenest in the world. It is Oregon's most populous city, and the third most populous city in the Pacific Northwest, after Vancouver, British Columbia, and Seattle, Washington. Approximately two million people live in Portland metropolitan area (MSA), the 23rd most populous in the United States as of July 2006.

Portland was incorporated in 1851 and is the seat of Multnomah County. The city extends slightly into Washington County to the west and Clackamas County to the south. It is governed by a commission-based government headed by a mayor and four other commissioners.

The city and region are noted for strong land-use planning and investment in public transit, supported by Metro, a distinctive regional-government scheme. Portland is also known for its large number of microbreweries, its coffee houses, and as the home of the Trail Blazers NBA basketball team.

Portland lies in the Marine west coast climate region, marked by warm summers and rainy but temperate 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 overlooking downtown.