Portland is the largest city in the U.S. state of Oregon and the county seat of Multnomah County, located at the confluence of the Willamette and Columbia rivers. The city covers 145 square miles (376 km²) and had an estimated population of 619,360 in 2014, making it the 28th most populous city in the United States. Approximately 2,348,247 people live in the Portland metropolitan statistical area (MSA), the 24th most populous MSA in the United States. Its Combined Statistical Area (CSA) ranks 17th with a population of 3,022,178.
Named after Portland, Maine, Portland was incorporated in 1851 near the end of the Oregon Trail, where it is situated along the Willamette River, between the Pacific Ocean and the Cascade Mountains. Its water access provided convenient transportation of goods, and the timber industry was a major force in the city's early economy. By the turn of the 20th century, the city had come to be regarded as one of the most dangerous port cities in the world, a hub of organized crime, violence, and racketeering, though its economy experienced an industrial boom during World War II. Beginning in the 1960s, Portland became noted for its growing liberal political values, and the city has earned a reputation as a bastion of counterculture which has proceeded into the 21st century.
The city operates with a commission-based government guided by a mayor and four commissioners as well as Metro, the only directly elected metropolitan planning organization in the United States. The city government is notable for its land-use planning and investment in public transportation. Portland is frequently recognized as one of the most environmentally conscious or "green" cities in the world because of its high walkability, large community of bicyclists, expansive network of public transportation options and 10,000+ acres of public parks. Its climate is marked by warm, dry summers and cold, rainy winters. This climate is ideal for growing roses, which has led to the Portland being known as the "City of Roses" for over a century. "Keep Portland Weird" is an unofficial slogan for the city.