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Pierrot
The address of the Seaside Public Library is: 1131 Broadway, Seaside, 97138 7817
The address of the Seaside Branch Library is: 550 Harcourt Ave., Seaside, 93955 4710
The address of the Seaside Museum And Historical Society is: 570 Necanicum Dr, Seaside, OR 97138
Yes, the word seaside is a common noun; a word for any seaside anywhere.
A proper noun is the name of a person, place, thing, or a title; for example: