List brokers and direct marketing services distribute mailing lists organized by ZIP code. The United States Postal Service, Experian and DirectMail.com offer routes and addresses by city, state, county and ZIP code on their websites.
All three companies allow customers to order their mailing lists online by choosing certain criteria. DirectMail.com presents the option of building a list with a map interface or a selection page. Clients can use ZIP codes for both choices and receive their lists on CDs, labels or in direct downloads. Experian's guided and advanced lists display ZIP codes as a search parameter. USPS's Every Door Direct Mail service delivers up to 5,000 messages per ZIP code per day for businesses without a mailing permit.