WELCOME TO CENTRALIA, WASHINGTON Centralia is a friendly, historic city located on I-5 midway between Seattle and Portland, just one mile east of the freeway. Most of the buildings in the area were built in the late 1800's and at the turn of the century. Centralia has 350 antique dealers located in its 11 antique malls. Antique shopping in Centralia has become a destination point for collectors ...