Address Validation Plus

DOTS Address Validation Plus by Service Objects is a real-time web service API that enables companies to validate, correct and standardize address data, pinpoint customer address locations with geocoding, and append demographic information all within a single API. DOTS Address Validation Plus improves the processing and delivery of mail by standardizing and verifying addresses to ensure deliverability by appending any missing information. In addition, this address verification service translates a street address to exact latitude/longitude coordinates and provides demographic data to create a comprehensive customer profile. Free to try.
More information: http://www.serviceobjects.com/products/address-geocoding/address-validation-plus