Thanks for the file, just a little commnet on the date in the file:

Bulgaria zone_codes are empty and
Republic of Congo and Congo are having same country code where actually they should be different.

COD Congo, the Democratic Republic of the
COG Congo

And Bulgaria should be:

479 33 BL Blagoevgrad
480 33 BS Burgas
481 33 TX Dobrich

As in:http://www.ubercart.org/forum/internationalization/17986/bulgarian_zones (google translated for non utf8
482 33 GA Gabrovo
483 33 HA Haskovo
484 33 KI Kardjali
485 33 KD Kyustendil
486 33 LV Lovech
487 33 MO Montana
488 33 PA Pazardjik
489 33 PK Pernik
490 33 PE Pleven
491 33 PV Plovdiv
492 33 RR Razgrad
493 33 SH Shumen
494 33 SS Silistra
495 33 SN Sliven
496 33 SM Smolyan
497 33 SO Sofia
498 33 SA Sofia - town
499 33 ST Stara Zagora
500 33 TA Targovishte
501 33 VN Varna
502 33 VT Veliko Tarnovo
503 33 VD Vidin
504 33 VA Vratza
505 33 YA Yambol