listci
The listci command lists all culture infos implemented in .Net. This will display the LCID, name, type, and display name of all CultureInfos.
listci | find " en"
returns
9 en N W English
1033 en-US SW English (United States)
2057 en-GB SW English (United Kingdom)
3081 en-AU SW English (Australia)
4105 en-CA SW English (Canada)
5129 en-NZ SW English (New Zealand)
6153 en-IE SW English (Ireland)
7177 en-ZA SW English (South Africa)
8201 en-JM SW English (Jamaica)
9225 en-029 SW English (Caribbean)
10249 en-BZ SW English (Belize)
11273 en-TT SW English (Trinidad and Tobago)
12297 en-ZW SW English (Zimbabwe)
13321 en-PH SW English (Republic of the Philippines)
16393 en-IN SW English (India)
17417 en-MY SW English (Malaysia)
18441 en-SG SW English (Singapore)
The list is sorted by the LCID by default, and can be changed using the -o switch. The -t switch restricts the list to certain CultureTypes.