Address Data Quality

1

What Is CASS Certification?

CASS (Coding Accuracy Support System) is the USPS standard for address validation software. Here's how it works and why it matters.

2

NCOA: Processing Address Changes at Scale

40 million Americans move each year. NCOA (National Change of Address) processing updates mailing lists to keep them current.

3

Address Standardization: USPS Rules and Best Practices

The USPS has strict formatting rules for addresses. Following them improves deliverability and qualifies mail for discounts.

4

Geocoding Accuracy: From Rooftop to ZIP Centroid

Not all geocodes are created equal. The precision gap between rooftop-level and ZIP-centroid geocoding can be miles wide.

5

DPV: Confirming an Address Actually Exists

CASS validates the street range; DPV confirms the specific address. This distinction prevents sending mail to nonexistent addresses.

6

Address Validation for E-Commerce Checkout

Bad addresses cost e-commerce companies $20+ per failed delivery. Real-time validation at checkout prevents the problem.

7

eLOT: Enhanced Line of Travel Sequencing

eLOT sequencing orders addresses by the carrier's actual walking route, enabling presort discounts and delivery efficiency.

8

Building an Address Quality Program

A comprehensive address quality program combines CASS, NCOA, DPV, and ongoing monitoring. Here's how to build one.