regular basis using the Case–Shiller index; the statistic is published by Standard & Poor's and is also a component of S&P's 20-city composite index of the value of the U.S. residential real estate market. Portland-Vancouver-Salem Combined Statistical Area As of March 2020, the Portland–Vancouver–Salem, OR–WA Combined Statistical Area (CSA) consists of five Metropolitan Statistical Areas, covering nine counties in Oregon and three counties in Washington: Portland-Vancouver-Hillsboro, OR-WA Metropolitan Statistical Area (five counties in Oregon - Multnomah, Washington, Clackamas, Yamhill, Columbia; two counties in Washington State - Clark and Skamania); population 2,492,412 (2019 estimate) Salem, OR Metropolitan Statistical Area (Marion and Polk counties); population 430,404 (2019 estimate) Albany-Lebanon, OR Metropolitan Statistical Area (Linn county); population 127,451 (2019 estimate) Longview, WA Metropolitan Statistical Area (Cowlitz county); population 108,752 (2019 estimate) Corvallis, OR Metropolitan Statistical Area (Benton county); population 92,442 (2019 estimate) The 2019 population estimate is 3,259,710, ranked 18th largest in the United States (2,921,408 based on the 2010 Census). This area includes the Portland–Vancouver–Hillsboro, OR–WA Metropolitan Statistical Area; Salem, OR Metropolitan Statistical Area, and other surrounding areas. Cities and other communities Major cities in the region in addition to Portland include Beaverton, Gresham, Hillsboro in Oregon, and Vancouver in Washington. The area also includes the smaller cities of Corbett, Cornelius, Fairview, Forest Grove, Gladstone, Happy Valley, King City, Lake Oswego, Milwaukie, Oregon City, Sherwood, Tigard, Troutdale, Tualatin, West Linn, Wilsonville, Wood Village in Oregon, as well as Battle Ground, Camas, Washougal, Ridgefield, La Center and Yacolt in Washington. It includes the unincorporated suburban communities in Oregon of Aloha, Beavercreek, Boring, Cedar Mill, Clackamas, Damascus, Dunthorpe, Garden Home, Raleigh Hills, and West Slope, as well as Hazel Dell, Minnehaha, Salmon Creek, Walnut Grove and Orchards in Washington. Major Portland Vancouver Hillsboro Gresham Beaverton Other Amity Battle Ground Banks Barlow Camas Canby Carlton Clatskanie Columbia City Cornelius Dayton Dundee Durham Estacada Fairview Forest Grove Gaston Gladstone Happy Valley Johnson City King City La Center Lafayette Lake Oswego Maywood Park McMinnville Milwaukie Molalla Newberg North Bonneville North Plains Oregon City Prescott Rainier Ridgefield Rivergrove St. Helens Sandy Scappoose Sheridan Sherwood Stevenson Tigard Troutdale Tualatin Vernonia Washougal West Linn Willamina Wilsonville Wood Village Woodland Yacolt Yamhill Transportation Portland is where Interstate 84 starts at Interstate 5, both major highways in the Pacific Northwest. Other primary roads include Interstate 205, an eastern bypass of the urban core, U.S. Route 26, which heads west and southeast, U.S.