A "Notice to File Online" will be mailed out in February, which will include the information necessary to file your property statement online. What is business personal property?What are examples of inventory and supplies? NOTICE: This publication is provided as a general resource for California's county tax collectors. The Tax office is located in the municipal building located at 237 S. Pavilion Avenue. Our mailing address is PO Box 188 Riverside, NJ 08075. The Treasurer and Tax Collector mails the Annual Secured Property Tax Bills each year in October to every owner listed on the Secured Tax Roll. Click on Tax Bills if you want to search your Real Estate, Personal Property, Motor Vehicle or Supplemental Bills. On behalf of the County of Riverside, we thank you for your timely payment of property taxes.