If you enter your address on the USPS website, you can even look up the sequence number used: https://www.usps.com/zip4/ https://www.usps.com/zip4/ After you

If you enter your address on the USPS website, you can even look up the sequence number used: https://www.usps.com/zip4/ https://www.usps.com/zip4/ After you enter an address, it's under "Mailing Industry Details", shown as "eLOT" (not sure what it stands for) https://ribbs.usps.gov/index.cfm?page=elot https://ribbs.usps.gov/index.cfm?page=elot