Finalist uses the Delivery Point Validation (DPV) database to match the addresses in your address file against USPS-provided data. The USPS data consists of low-to-high ranges for streets in the United States. If your input address falls within the low-to-high range for the input address street, Finalist standardizes the address and assigns the appropriate ZIP Code, ZIP + 4 Code, carrier route code, and delivery point barcode for that range. However, this process does not ensure that the address actually exists or that the USPS actually delivers mail to the address. It only indicates that your input address falls within a known range for the input address street. According to USPS statistics, up to 10% of this coded mail is still undeliverable as addressed.
The DPV Option uses DPV data from the USPS to ensure your input file addresses are actual physical addresses to which the USPS delivers mail. Finalist DPV processing verifies the existence of an address to as fine a level as an apartment or suite.