Oregon Capital is the city of Salem, which is the capital of the U.S. state of Oregon. Salem is located in the center of the Willamette Valley, and is the county seat of Marion County. It is the third-largest city in the state, with a population of approximately 170, 000 people. Salem is known for its rich history, diverse culture, and vibrant economy. It is home to a number of museums, galleries, and other attractions, as well as several universities and colleges.