These steps are more commonly needed in the UK version, but they also apply to the US version when querying on foreign addresses.
 
  1. Create a constituent query
  2. Filter on Addresses, Preferred Address, Preferred Postcode begins with A[1-99]
    AND Addresses, Preferred Address, Preferred Postcode does not begin with A[A-Z]
    Replace A[1-99] and A[A-Z] with the appropriate criteria.