Click on one of the following underlined words and you will be directed to the numerous Real Property Tax Service Agency services and products. Most of the services provided by the Agency are at its Riverhead location where there is an owner index and tax map information with a pleasant staff to assist you on your quest. The Tax Map Division has the responsibility and is the sole authority responsible for creating and maintaining the tax maps of Suffolk County. Verification is a procedure that helps to maintain the most current information on each tax map parcel and is required by law prior to recording of documents.