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Thank you for visiting the San Isidro ISD Tax Office LinkHours of Operation are from 7:30 am - 4:00 pmMonday - FridayOffice Follows Same Holiday Schedule as School(Exception Summer Break)Telephone & Fax Numbers(956) 481-3100Fax (956) 481-3597Physical and Mailing Address5175 FM 1017PO Box 10San Isidro, TX 78588