create a table for zip codes:
zipcodes:
zipcodeID - primary key
zipcodeValue
another for suppliers:
supplierID - Priamry Key
supplierName
etc..
and a third table to link them:
supplierzipcodes:
supplierzipcodeID - Primary key
supplierzipcodeZipCodeID - relates to zipcodes.zipcodeID
supplierzipcodeSupplierID - relates to suppliers.supplierID