Portland (/ ˈ p ɔːr t l ə n d /, PORTlənd) 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 2019, Portland had an estimated population of 654,741, making it the 26th most ...Portland Stone or Portland Stone Formation is a limestone formation from the Tithonian stage of the Jurassic period quarried on the Isle of Portland, Dorset, England. The quarries are cut in beds of whitegrey limestone separated by chert beds. It has been used extensively as a building stone throughout the British Isles, notably in major public buildings in London such as St Pauls Cathedral ...
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