9-Digit zip codes:
If you need latitude & longitude data, but 5-digit zip codes are too large of an area, you need to purchase the 9-digit zip codes with latitude & longitude. 

Description:
There are about 60 million 9-digit zip codes (called Zip+4).  We are not able to maintain this level of detail, so we have become authorized resellers for GDT (Geographic Data Technology).  They have a product, Dynamap Zip+4 Centroids, which has the 9-digit centroids (latitude & longitude coordinates).

Pricing:
Prices start at $2,000 for one state or $10,000 for the nation, 1-5 users, single edition.  For the best value, we recommend purchasing the product along with quarterly updates.  The nation is $12,500 for 1-5 users, for the current edition, plus 3 quarterly updates.  Call us for exact pricing.