The Bexar County Tax Office offers the option of paying your Property Taxes online with either a major credit card or an electronic check (ACH). The Bexar County Tax Office offers the option of paying your Property Taxes online with either a major credit card or an electronic check (eCheck).For questions, call the Bexar County Tax Assessor-Collector's Office at 210-335-6628. 411 North Frio Street San Antonio, TX 78207 Mailing Address: PO Box 830248 San Antonio, TX 78283 Customer Service: (210) 224-782832 Fax: (210) The Online Payment System allows you to resolve certain cases without the necessity of a court appearance for some Traffic, Misdemeanor and Parking Citations. Then fill out and sign the application. Mail it or bring the bottom portion of it to our office at 8601 Midcrown. Other locations may be available. You must file this return if you are a sole owner, partnership, corporation or other organization who is responsible for. Federal dollars are available in Bexar County to help people pay overdue mortgages and delinquent property taxes.