Street address normalization for MDM solutions

Quite often we need to verify street addresses or normalize them to check for duplicate customers. The following article gives a good overview of the various techniques we can use for this problem context.

http://brizzled.clapper.org/blog/2012/02/14/simple-address-standardization/

There are also a lot of commercial and open source software for address verification and geo-coding. For e.g.
http://smartystreets.com/
http://www.addressdoctor.com/en/
http://www.melissadata.com/