Webharris county tax assessor's office. Ad valorem tax, more commonly known as property tax, is a large source of revenue for governments in georgia. Webthe harris county tax assessor's office is required by the georgia department of revenue to periodically update their records on all properties and homes within the. Tax statements and receipts. Webaccess tax information and services for harris county, georgia, through the official webtax portal. Webonline access to maps, real estate data, tax information, and appraisal data. How is my property value determined? What property exemptions are available? How can i appeal my assessment? How is the tax rate.