List of World COUNTRY/ADMINISTRATIVE-AREA NAMES (254) -- from a gadm.org web page:

AFG_Afghanistan
XAD_Akrotiri and Dhekelia
ALA_Åland
ALB_Albania
DZA_Algeria
ASM_American Samoa
AND_Andorra
AGO_Angola
AIA_Anguilla
ATA_Antarctica
ATG_Antigua and Barbuda
ARG_Argentina
ARM_Armenia
ABW_Aruba
AUS_Australia
AUT_Austria
AZE_Azerbaijan
BHS_Bahamas
BHR_Bahrain
BGD_Bangladesh
BRB_Barbados
BLR_Belarus
BEL_Belgium
BLZ_Belize
BEN_Benin
BMU_Bermuda
BTN_Bhutan
BOL_Bolivia
BES_Bonaire, Saint Eustatius and Saba
BIH_Bosnia and Herzegovina
BWA_Botswana
BVT_Bouvet Island
BRA_Brazil
IOT_British Indian Ocean Territory
VGB_British Virgin Islands
BRN_Brunei
BGR_Bulgaria
BFA_Burkina Faso
BDI_Burundi
KHM_Cambodia
CMR_Cameroon
CAN_Canada
CPV_Cape Verde
XCA_Caspian Sea
CYM_Cayman Islands
CAF_Central African Republic
TCD_Chad
CHL_Chile
CHN_China
CXR_Christmas Island
XCL_Clipperton Island
CCK_Cocos Islands
COL_Colombia
COM_Comoros
COK_Cook Islands
CRI_Costa Rica
CIV_Côte d'Ivoire
HRV_Croatia
CUB_Cuba
CUW_Curaçao
CYP_Cyprus
CZE_Czech Republic
COD_Democratic Republic of the Congo
DNK_Denmark
DJI_Djibouti
DMA_Dominica
DOM_Dominican Republic
ECU_Ecuador
EGY_Egypt
SLV_El Salvador
GNQ_Equatorial Guinea
ERI_Eritrea
EST_Estonia
ETH_Ethiopia
FLK_Falkland Islands
FRO_Faroe Islands
FJI_Fiji
FIN_Finland
FRA_France
GUF_French Guiana
PYF_French Polynesia
ATF_French Southern Territories
GAB_Gabon
GMB_Gambia
GEO_Georgia
DEU_Germany
GHA_Ghana
GIB_Gibraltar
GRC_Greece
GRL_Greenland
GRD_Grenada
GLP_Guadeloupe
GUM_Guam
GTM_Guatemala
GGY_Guernsey
GIN_Guinea
GNB_Guinea-Bissau
GUY_Guyana
HTI_Haiti
HMD_Heard Island and McDonald Islands
HND_Honduras
HKG_Hong Kong
HUN_Hungary
ISL_Iceland
IND_India
IDN_Indonesia
IRN_Iran
IRQ_Iraq
IRL_Ireland
IMN_Isle of Man
ISR_Israel
ITA_Italy
JAM_Jamaica
JPN_Japan
JEY_Jersey
JOR_Jordan
KAZ_Kazakhstan
KEN_Kenya
KIR_Kiribati
XKO_Kosovo
KWT_Kuwait
KGZ_Kyrgyzstan
LAO_Laos
LVA_Latvia
LBN_Lebanon
LSO_Lesotho
LBR_Liberia
LBY_Libya
LIE_Liechtenstein
LTU_Lithuania
LUX_Luxembourg
MAC_Macao
MKD_Macedonia
MDG_Madagascar
MWI_Malawi
MYS_Malaysia
MDV_Maldives
MLI_Mali
MLT_Malta
MHL_Marshall Islands
MTQ_Martinique
MRT_Mauritania
MUS_Mauritius
MYT_Mayotte
MEX_Mexico
FSM_Micronesia
MDA_Moldova
MCO_Monaco
MNG_Mongolia
MNE_Montenegro
MSR_Montserrat
MAR_Morocco
MOZ_Mozambique
MMR_Myanmar
NAM_Namibia
NRU_Nauru
NPL_Nepal
NLD_Netherlands
NCL_New Caledonia
NZL_New Zealand
NIC_Nicaragua
NER_Niger
NGA_Nigeria
NIU_Niue
NFK_Norfolk Island
PRK_North Korea
XNC_Northern Cyprus
MNP_Northern Mariana Islands
NOR_Norway
OMN_Oman
PAK_Pakistan
PLW_Palau
PSE_Palestina
PAN_Panama
PNG_Papua New Guinea
PRY_Paraguay
PER_Peru
PHL_Philippines
PCN_Pitcairn Islands
POL_Poland
PRT_Portugal
PRI_Puerto Rico
QAT_Qatar
COG_Republic of Congo
REU_Reunion
ROU_Romania
RUS_Russia
RWA_Rwanda
BLM_Saint-Barthélemy
MAF_Saint-Martin
SHN_Saint Helena
KNA_Saint Kitts and Nevis
LCA_Saint Lucia
SPM_Saint Pierre and Miquelon
VCT_Saint Vincent and the Grenadines
WSM_Samoa
SMR_San Marino
STP_Sao Tome and Principe
SAU_Saudi Arabia
SEN_Senegal
SRB_Serbia
SYC_Seychelles
SLE_Sierra Leone
SGP_Singapore
SXM_Sint Maarten
SVK_Slovakia
SVN_Slovenia
SLB_Solomon Islands
SOM_Somalia
ZAF_South Africa
SGS_South Georgia and the South Sandwich Islands
KOR_South Korea
SSD_South Sudan
ESP_Spain
LKA_Sri Lanka
SDN_Sudan
SUR_Suriname
SJM_Svalbard and Jan Mayen
SWZ_Swaziland
SWE_Sweden
CHE_Switzerland
SYR_Syria
TWN_Taiwan
TJK_Tajikistan
TZA_Tanzania
THA_Thailand
TLS_Timor-Leste
TGO_Togo
TKL_Tokelau
TON_Tonga
TTO_Trinidad and Tobago
TUN_Tunisia
TUR_Turkey
TKM_Turkmenistan
TCA_Turks and Caicos Islands
TUV_Tuvalu
UGA_Uganda
UKR_Ukraine
ARE_United Arab Emirates
GBR_United Kingdom
USA_United States
UMI_United States Minor Outlying Islands
URY_Uruguay
UZB_Uzbekistan
VUT_Vanuatu
VAT_Vatican City
VEN_Venezuela
VNM_Vietnam
VIR_Virgin Islands, U.S.
WLF_Wallis and Futuna
ESH_Western Sahara
YEM_Yemen
ZMB_Zambia
ZWE_Zimbabwe