US Address Lookup

Validate an address, instantly.


This demo is powered by Firstlogic DQ

This tool is specifically designed to showcase the capabilities of Firstlogic software and demonstrate how it can be used to power a web-based application.

If you're interested in adding self‑managed or on-premise address verification to your application or workflow, we'd love to chat.

How to verify your US address

  1. 1
    Enter your address into the component fields.
  2. 2
    Click the "Go" or "Submit" to securely send the address to our high performance servers.
  3. 3
    Our software corrects any malformed addresses and standardizes them to the extent possible - verified against the official USPS address database.
  4. 4
    The verified and enriched address is returned to you along with its latitude/longitude, zip+4 code, county FIPS code, and more.

Firstlogic is a Leader in Enterprise Data Quality.

Address verification and address validation solves a host of problems. Using a real-time SDK, you can embed address verification into a custom workflow or application. Build useful tools and applications - like the demo tool you see at the top of the page, which was built using the Address IQ SDK.

Enhanced deliverability

Confirm that an address is correct and deliverable for shipping packages or mail.

Data preparation

Prepare address data for further processing, such as geocode enrichment.

Matching and deduplication

Clean duplicate address data from your databases.

Enhanced address data

Append missing data (such as extended postal codes and county data) to your addresses.

Common Use Cases

  • Data Quality Operations

  • Mailroom Operations

  • Data-Driven Marketing

  • Compliance & Financials

    • Data preparation for merging databases
    • Data governance
    • General data quality
    • Improved shipping and package delivery
    • Bulk-mailing postal discounts
    • Reduced rate of returned packages
    • Targeted marketing
    • 360-degree view of customer
    • Geographic and regional campaign targeting
    • Improved asset management
    • More accurate risk profiling for insurance underwriting
    • Fraud prevention and privacy compliance

The Address Verification process

Address verification is a multi-step process that begins with an input address and ends with a validated address, formatted to include data for increased accuracy and mail deliverability. We'll break it down for you here.

  1. 1
    Non-standardized, non-cleansed address data is provided as input.
  2. 2
    Identifies the component data elements within your non-standardized address data and break them out into their component parts.
  3. 3
    Correct & Standardize
    Eliminates spelling & format errors in address to comply with authoritative standards & improve mail delivery.
  4. 4
    Confirms an address’s existence against the official USPS address database. Checks if the address is residential or business. Also checks if the address is deliverable using USPS Delivery Point Validation (DPV).

Additional Resources

Firstlogic has identified some common questions around the usage of this demo tool, and address validation in general.

Frequently asked questions about the Address Verification tool

How do I verify an address?

You can simply use our free tool at the top of the page. Enter your address in the form above, then click “Go” or “Submit” to launch the validation process.

I have a PO box address. How do I validate it using your tool?

Our software supports PO box addresses as well. To validate a PO box address, put your PO box information into the Street Address field, then provide the City and State information before proceeding.


For example, let’s use a hypothetical PO Box with the number #123 located in La Crosse, Wisconsin. You would provide the following information:


Street Address: PO Box 123
City: La Crosse
State: WI

How do I verify an incomplete USPS address?

To verify an incomplete USPS address, enter your information in Firstlogic’s USPS address checker at the top of the page. In many cases, the address standardization tool can validate an address after appending missing data such as city, or Zip Code, or street direction.

How do I verify a military address using your tool?

To verify a military address, you should use the guidelines provided by the USPS, which is to set the APO/FPO designation in the City field and the two-letter AA/AE/AP designation in the State field.

An example military address entered into the address verification tool.

AA/AE/AP designations:

  • – “AA” (Armed Forces of the Americas)
  • – “AE” (Armed Forces of Europe)
  • – “AP” (Armed Forces of the Pacific)

Data Quality. Delivered.

For over 35 years, Firstlogic address cleansing and validation software has been an industry standard. We have decades of experience handling the irregularities and pitfalls that arise when working with customer data & addresses. Firstlogic specializes in providing self-managed, on-premise or in-cloud data quality software that is performant and ready for large datasets.

If your company has enterprise-level needs for USPS CASS-certified software that handles address validation, our products will be a good fit.

Ready to get started?

Request a demo or talk to our sales team today