Cities with 0 (zero)

The Problem: Seems many, MANY, "city" fields in the database have a 0 (zero), thus I can't get it to return a result for many of the IP's I enter, however when I enter the IP on this site it works. I believe my script is working right because it is working for some IP's (resolving to a city/state). Here's an example:
Example IP (real): 68.6.129.178
My Query: SELECT city, country FROM ip4_68 WHERE b = '6' && c = '129'
Result: city: 0 - country: 226
Next Query: SELECT name FROM cityByCountry WHERE city = '0' && country = '226'
(Obviously if "city" is 0 there is no chance I will get a result back.)
Any thoughts?

Example IP (real): 68.6.129.178
My Query: SELECT city, country FROM ip4_68 WHERE b = '6' && c = '129'
Result: city: 0 - country: 226
Next Query: SELECT name FROM cityByCountry WHERE city = '0' && country = '226'
(Obviously if "city" is 0 there is no chance I will get a result back.)
Any thoughts?


