Title: List of people from Portland, Oregon
Content:  Portland is a port city in the U.S. state of Oregon located at the confluence of the Willamette and Columbia Rivers. Established in the 1830s as a camp along the Oregon Trail, Portland evolved into a major West Coast industrial city during the twentieth century. Contemporarily, it is the most populous city in Oregon, and the second-largest city in the Pacific Northwest. This list of notable people includes persons who were either born in, are current residents of, or have lived in Portland. A person who lives in or comes from Portland, Oregon is called a Portlander.
Title: Portland, Oregon
Content:  Portland is the largest and most populous city in the U.S. state of Oregon, and the seat of Multnomah County. It is a major port in the Willamette Valley region of the Pacific Northwest, at the confluence of the Willamette and Columbia rivers in Northwestern Oregon. As of 2020, Portland had a population of 652,503, making it the 25th-most populated city in the United States, the sixth-most populous on the West Coast, and the second-most populous in the Pacific Northwest, after Seattle. Approximately 2.5 million people live in the Portland metropolitan statistical area (MSA), making it the 25th most populous 
Title: Portland, Maine
Content:  Portland is the largest city in the U.S. state of Maine and the seat of Cumberland County. Portland's population was 68,408 in April 2020. The Greater Portland metropolitan area is home to over half a million people, the 105th-largest metropolitan area in the United States. Portland's economy relies mostly on the service sector and tourism. The Old Port district is known for its nightlife and 19th-century architecture. Marine industry still plays an important role in the city's economy, with an active waterfront that supports fishing and commercial shipping. The Port of Portland is the second-largest tonnage seaport in New England. The city seal depicts a phoenix rising from ashes, a reference to recovery from four devastating fires. Portland was named after the English Isle of Portland, Dorset. In turn, the city of Portland, Oregon was named after Portland, Maine. The word Portland is derived from the Old English word Portlanda, which means "land surrounding a harbor". The Greater Portland area has emerged as an important center for the creative economy, which is also bringing gentrification.
Title: Government of Portland, Oregon
Content:  Portland is the county seat of Multnomah County, and the core of Metro, a regional government primarily concerned with land use planning. Both of these government entities have a strong impact on Portland policy. Portland is also governed by the government of Oregon and the federal government of the United States.
Title: Portland, Maine
Content:   Portland has become Maine's economic capital because the city has Maine's largest port, largest population, and is close to Boston (105 miles to the southwest). Over the years, the local economy has shifted from fishing, manufacturing, and agriculture towards a more service-based economy. Most national bank institutions and other related financial organizations such as Bank of America and Key Bank base their Maine operations in Portland. Unum, Covetrus, TruChoice Federal Credit Union, People's United Bank, ImmuCell Corp, and Pioneer Telephone have headquarters here, and Portland's neighboring cities of South Portland, Westbrook and Scarborough, provide homes for other corporations including IDEXX and 
Title: Portland metropolitan area, Oregon
Content:  The Portland metropolitan area is a metro area in the U.S. states of Oregon and Washington centered on the principal city of Portland, Oregon. The U.S. Office of Management and Budget (OMB) identifies it as the Portland–Vancouver–Hillsboro, OR–WA Metropolitan Statistical Area, a metropolitan statistical area used by the United States Census Bureau (USCB) and other entities. The OMB defines the area as comprising Clackamas, Columbia, Multnomah, Washington, and Yamhill Counties in Oregon, and Clark and Skamania Counties in Washington. The area's population is estimated at 2,753,168 in 2017. The Oregon portion of the metropolitan area is the state's largest urban center, while the Washington portion of the metropolitan area is the state's third largest urban center after Seattle (the Seattle Urban Area includes Tacoma and Everett ). Portions of this area (Clackamas, Multnomah, and Washington Counties) are under the jurisdiction of Metro, a directly elected regional government which, among other things, is responsible for land-use planning in the region.
Title: Portland, Victoria
Content:  Portland is a city in Victoria, Australia, and is the oldest European settlement in the state. It is also the main urban centre in the Shire of Glenelg and is located on Portland Bay. In June 2018 the estimated population was 10,900, having decreased slowly at an average annual rate of −0.03% year-on-year over the preceding five years.
Title: Portland, Texas
Content:  Portland is located at 27.88306°N, -97.32056°W (27.883117, -97.320466). According to the United States Census Bureau, the city has a total area of 9.6 sq mi (24.9 km2), of which 7.0 sq mi (18.1 km2) are land and 2.6 sq mi (6.8 km2) (27.44%) are covered by water. The city is roughly equidistant from Portland, Maine, and Portland, Oregon. In 2014 and 2015, the city annexed an additional 1.27 sq mi, bringing the total area to 10.87 sq mi.
Title: Portland, Oregon
Content:  the city's economy experienced an industrial boom during World War II, its hard-edged reputation began to dissipate. Beginning in the 1960s, Portland became noted for its growing progressive political values, earning it a reputation as a bastion of counter-culture. 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. Its climate is marked by warm, dry summers and cool, rainy winters. This climate is ideal for growing roses, and Portland has been called the "City of Roses" for over a century.
Title: Portland, Tennessee
Content:  According to the United States Census Bureau, the city has a total area of 11.4 sqmi, of which, 11.4 sqmi is land and 0.09% is water. Portland is the northern terminus of U.S. Bicycle Route 23. Portland is considered the strawberry capital of Tennessee.

Question: What is Portland the capital of?
Answer: Multnomah County.
Multnomah County, Oregon.