The file zonedata.c contains the information about the tone zones used in libtonezone (and hence also in ztcfg). Here is a list of those zones:
- us - United States / North America
- au - Australia
- fr - France
- nl - Netherlands
- uk - United Kingdom
- fi - Finland
- es - Spain
- jp - Japan
- no - Norway
- at - Austria
- nz - New Zealand
- it - Italy
- us-old - United States Circa 1950 / North America
- gr - Greece
- tw - Taiwan
- cl - Chile
- se - Sweden
- be - Belgium
- sg - Singapore
- il - Israel
- br - Brazil
- hu - Hungary
- lt - Lithuania
- pl - Poland
- za - South Africa
- pt - Portugal
- ee - Estonia
- mx - Mexico
- in - India
- de - Germany
- ch - Switzerland
- dk - Denmark
- cz - Czech Republic
- cn - China
- ar - Argentina
- my - Malaysia
- th - Thailand
- bg - Bulgaria
- ve - Venezuela
- ph - Philippines
- ru - Russian Federation
- tr - Turkey
- pa - Panama
- mo - Macao,China
- cr - Costa Rica
- ae - United Arab Emirates