The United States Postal Service utilizes various codes to help organize geography in a more efficient way for deliveries. These codes can be added to your voter list as fields, and can help give you a better idea of the geographic layout of your targeted voters for purposes of door knocking or mailing. There are six different USPS Codes that can be selected as fields:

Delivery Point Code:  A specific set of digits between 00 and 99 assigned to every address. When combined with the Zip+4 Code, the delivery point provides a unique identifier for every deliverable address

Delivery Point Check Digit: A single digit that is added to the digits in a ZIP+4 Code and Delivery Point Code to validate the associated address
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Carrier Route Code: The last three digits of a 9 digit identifier assigned to a group of mailing addresses (i.e. neighborhoods) to aid in mail delivery efficiency
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​Example: 95765R135  The first (5) digits indicate the ZIP Code. The next digit is a letter which defines the route type (i.e. R for Rural), and the last 3 digits are the carrier route code (135).
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​Line of Travel / Order: A sequence required for some carrier routes, arranged by ZIP+4 Codes in the order in which the route is served by the carrier
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USPS DP Verification: Verifies that an address is deliverable; Y = Valid, N = Invalid

These fields are automatically included for the List Styles Mailing List or Walk List.
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You can also create your own unique combination of fields by selecting User Defined
List and then add the USPS code fields manually.
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