USPS Address Lookup [2023] : FAQs

by Alice Scott - Updated Jan 13, 2023

A USPS Address Lookup is a quick and easy process. If you have an incomplete address or an address that you need to verify, a USPS Address Lookup can quickly help you find missing address information or validate an address that you’re unsure about.

What is a USPS Address Lookup?

A USPS (U.S. Postal Service) Address Lookup is a process where someone can check the validity of an address against an authoritative source or database, to verify if it is a real and complete, mailing address.

How do I find the correct zip code for an address?

You can quickly find or verify the correct 5-digit zip code for an address by using the usps address lookup tool on the website:

Enter the Street Address, City and State then click Find.

USPS Zip Code Lookup Tool
USPS Address Lookup Tools help you validate correct addresses, house numbers, city names and zip codes.

After you click Find, the address validation api will display the correct zip code:

USPS Address Lookup

When would someone perform a USPS Address Lookup?

People and businesses perform address lookups for many reasons.

These are the most common reasons for usps lookups:

  • Zip code lookup by address: you might need to do this if you have an incomplete mailing address that is missing a zip code.
  • USPS change of address: if you know someone has recently moved, but you don’t have their new, mailing address.
  • USPS address lookup by name: if you have someone’s name, but not their current mailing address.
  • USPS lookup by address: if you need to find the Name of the person or people who live at an address

How do I verify an address with the post office?

Verifying One Address

If you want to verify one or a few addresses, you can use the free address validation tool on the website:

Simply enter a valid address that you want to verify and click ‘Find’.

This tool is quick, simple and free.

Verifying Many Addresses

If you want to verify the address information for lots of addresses in an address list, you will most likely need to pay a company to help you.

LeadsPlease offers Address Validation services. Please Contact Us for more information and pricing.

How much does it cost to verify an address?

If you have one or a few addresses to verify, in most cases you can verify them for free! But if you want to verify a list of addresses, and you don’t want to do it manually one by one, you will most likely need to pay a fee for a company to help you.

LeadsPlease does offer Address Verification services.

Please Contact Us for more information and pricing.

I have lots of postal addresses that I need to verify. Can you help me?

Yes! LeadsPlease does offer Address Verification services.

So, if you want to update all the mailing addresses on your list, we can help you.

  1. Email us your address list in a .xls or .csv file format
  2. We will run your list through USPS approved NCOA address validation software and update your address data with correct addresses
  3. We email you your updated list with correct, accurate addresses

Please Contact Us for more information and pricing.

What is the USPS change of address process?

When a household or a business move, they need to update their new mailing address with the United States Postal Service.

People and businesses can update their change of address on the USPS website: Official USPS Change-of-Address

If you want to receive mail at your new address, you must submit your change of address with the USPS. If you don’t notify the USPS of your change of address, you won’t receive mail at your new address.

What is the correct address format?

When add an address to your mail piece, it needs to be in the correct format. If you don’t address your direct mail piece correctly, the postal service might mark your mailing piece as undeliverable and will not deliver it.

Here’s an example of how to correctly address a mailing piece to someone at a residential home:

First and Last Name

Street Number + Street Name, Building Number / Apartment #

City State Zip code

Here’s an example of how to correctly address a mailing piece to a company:

Contact Name & Title (if applicable)

Company Name

Street Number + Street Name, Building Number / Suite Number

City State Postal code

What is the USPS Move Update?

According to the USPS website:

The Move Update standard is a means of reducing the number of mailpieces in a mailing that require forwarding or return by the periodic matching of a mailer’s address records with change-of-address orders received and maintained by the Postal Service™. 

USPS Move Update

So, in a nutshell, the USPS encourages you to update your mailing list every 95 days.

If you claim First-Class Mail presorted/automation prices, USPS Marketing prices or Parcel Select Lightweight prices, the post office will require to see proof that you have updated your mailing list within the last 95 days.

Other Helpful Resources

Happy Customers Growing Their Businesses with LeadsPlease Mailing Lists


USPS Address Lookup FAQs

What is CASS?

CASS stands for Coding Accuracy Support System. It is a certification process maintained by the USPS. It evaluates the quality of addresses.

What is Delivery Point Validation or DPV?

DPV confirms if an address is real, accurate and deliverable.

Can we help you?

Call us on 866 306 8674

for free expert assistance.