The National Association of Advertising Distributors (NAAD) is an association of direct mail service providers located across the United States. Our members compile the National Resident Database (NRD). For more than 40 years the NRD has been the most complete and accurate mailing list of deliverable United States households available. Our members update and manage their local resident information – there is no substitute for this familiarity with the market. And, since we also mail what we sell, you can be assured of our data integrity.