Saturation mailing lists are created by using mail carrier routes defined by the U S Post Office. The Post Office has divided the United States into Zip Codes. Zip Codes can have anywhere from 1000 to 15,000 or more deliveries. Zip Codes are broken down into Mail Carrier Routes. The average carrier route has 300 to 500 deliveries. By using carrier route selections, mailers can target specific neighborhoods rather than entire zip codes. Saturation mailing lists come directly from the USPS are updated every 2 months and the average deliverability is 97%.

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