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Directory Results for Box or Route number) City, State, ZIP code Texas Sales and Use Tax Permit Number (must contain 11 digits) Outofstate retailer 's registration number or Federal Taxpayers Registry (RFC) number for retailers based in Mexico (Retailers based to Box or Route number) City, State, ZIP code Texas Sales or Use Tax Permit Number (or outofstate retailer 's registration number or date applied for Texas Permit must contain 11 digits if from a Texas permit) (Mexican retailers must show