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The Rhode Island Association of Assessing Officers Postings Events Member Forum Education Resources Contact Us WELCOME TO THE RIAAO WEBSITE WELCOME TO THE RIAAO WEBSITE The Rhode Island Association of Assessing Officers RIAAO is a professional organization that is affiliated with the International Association of Assessing Officers. RIAAO Membership is open to all State of Rhode Island public officials who are engaged in the administration of property assessments including assessors employees of assessors offices and board of assessment appeals members. Subscribing membership is open to individuals or companies interested in property assessment or a related field. The mission of the RIAAO is to improve the standards of assessment practices within the State of Rhode Island.