User account has c and co attributes to specify the country of the user. c attribute has the country code and co has actual country name. When we edit the user accounts to populate the country code, we need to know the correct code. These country codes are defined in ISO 3166 (LINK).
If you use PowerShell, use this command to update the country.
Set-ADUser <SAMAccountName> -Country US
For you convenience, I have created an CSV file (LINK) and also the table below.
English short name
Alpha-2 code
Afghanistan
AF
South Africa
ZA
Åland Islands
AX
Albania
AL
Algeria
DZ
Germany
DE
Andorra
AD
Angola
AO
Anguilla
AI
Antarctica
AQ
Antigua and Barbuda
AG
Saudi Arabia
SA
Argentina
AR
Armenia
AM
Aruba
AW
Australia
AU
Austria
AT
Azerbaijan
AZ
Bahamas (the)
BS
Bahrain
BH
Bangladesh
BD
Barbados
BB
Belarus
BY
Belgium
BE
Belize
BZ
Benin
BJ
Bermuda
BM
Bhutan
BT
Bolivia (Plurinational State of)
BO
Bonaire, Sint Eustatius and Saba
BQ
Bosnia and Herzegovina
BA
Botswana
BW
Bouvet Island
BV
Brazil
BR
Brunei Darussalam
BN
Bulgaria
BG
Burkina Faso
BF
Burundi
BI
Cabo Verde
CV
Cayman Islands (the)
KY
Cambodia
KH
Cameroon
CM
Canada
CA
Chile
CL
China
CN
Christmas Island
CX
Cyprus
CY
Cocos (Keeling) Islands (the)
CC
Colombia
CO
Comoros (the)
KM
Congo (the Democratic Republic of the)
CD
Congo (the)
CG
Cook Islands (the)
CK
Korea (the Republic of)
KR
Korea (the Democratic People’s Republic of)
KP
Costa Rica
CR
Côte d’Ivoire
CI
Croatia
HR
Cuba
CU
Curaçao
CW
Denmark
DK
Djibouti
DJ
Dominican Republic (the)
DO
Dominica
DM
Egypt
EG
El Salvador
SV
United Arab Emirates (the)
AE
Ecuador
EC
Eritrea
ER
Spain
ES
Estonia
EE
United States of America (the)
US
Ethiopia
ET
Falkland Islands (the) [Malvinas]
FK
Faroe Islands (the)
FO
Fiji
FJ
Finland
FI
France
FR
Gabon
GA
Gambia (the)
GM
Georgia
GE
South Georgia and the South Sandwich Islands
GS
Ghana
GH
Gibraltar
GI
Greece
GR
Grenada
GD
Greenland
GL
Guadeloupe
GP
Guam
GU
Guatemala
GT
Guernsey
GG
Guinea
GN
Equatorial Guinea
GQ
Guinea-Bissau
GW
Guyana
GY
French Guiana
GF
Haiti
HT
Heard Island and McDonald Islands
HM
Honduras
HN
Hong Kong
HK
Hungary
HU
Isle of Man
IM
United States Minor Outlying Islands (the)
UM
India
IN
British Indian Ocean Territory (the)
IO
Indonesia
ID
Iran (Islamic Republic of)
IR
Iraq
IQ
Ireland
IE
Iceland
IS
Israel
IL
Italy
IT
Jamaica
JM
Japan
JP
Jersey
JE
Jordan
JO
Kazakhstan
KZ
Kenya
KE
Kyrgyzstan
KG
Kiribati
KI
Kuwait
KW
Lao People’s Democratic Republic (the)
LA
Lesotho
LS
Latvia
LV
Lebanon
LB
Liberia
LR
Libya
LY
Liechtenstein
LI
Lithuania
LT
Luxembourg
LU
Macao
MO
Macedonia (the former Yugoslav Republic of)
MK
Madagascar
MG
Malaysia
MY
Malawi
MW
Maldives
MV
Mali
ML
Malta
MT
Northern Mariana Islands (the)
MP
Morocco
MA
Marshall Islands (the)
MH
Martinique
MQ
Mauritius
MU
Mauritania
MR
Mayotte
YT
Mexico
MX
Micronesia (Federated States of)
FM
Moldova (the Republic of)
MD
Monaco
MC
Mongolia
MN
Montenegro
ME
Montserrat
MS
Mozambique
MZ
Myanmar
MM
Namibia
NA
Nauru
NR
Nepal
NP
Nicaragua
NI
Niger (the)
NE
Nigeria
NG
Niue
NU
Norfolk Island
NF
Norway
NO
New Caledonia
NC
New Zealand
NZ
Oman
OM
Uganda
UG
Uzbekistan
UZ
Pakistan
PK
Palau
PW
Palestine, State of
PS
Panama
PA
Papua New Guinea
PG
Paraguay
PY
Netherlands (the)
NL
Peru
PE
Philippines (the)
PH
Pitcairn
PN
Poland
PL
French Polynesia
PF
Puerto Rico
PR
Portugal
PT
Qatar
QA
Syrian Arab Republic
SY
Central African Republic (the)
CF
Réunion
RE
Romania
RO
United Kingdom of Great Britain and Northern Ireland (the)
GB
Russian Federation (the)
RU
Rwanda
RW
Western Sahara*
EH
Saint Barthélemy
BL
Saint Kitts and Nevis
KN
San Marino
SM
Saint Martin (French part)
MF
Sint Maarten (Dutch part)
SX
Saint Pierre and Miquelon
PM
Holy See (the)
VA
Saint Vincent and the Grenadines
VC
Saint Helena, Ascension and Tristan da Cunha
SH
Saint Lucia
LC
Solomon Islands
SB
Samoa
WS
American Samoa
AS
Sao Tome and Principe
ST
Senegal
SN
Serbia
RS
Seychelles
SC
Sierra Leone
SL
Singapore
SG
Slovakia
SK
Slovenia
SI
Somalia
SO
Sudan (the)
SD
South Sudan
SS
Sri Lanka
LK
Sweden
SE
Switzerland
CH
Suriname
SR
Svalbard and Jan Mayen
SJ
Swaziland
SZ
Tajikistan
TJ
Taiwan (Province of China)
TW
Tanzania, United Republic of
TZ
Chad
TD
Czech Republic (the)
CZ
French Southern Territories (the)
TF
Thailand
TH
Timor-Leste
TL
Togo
TG
Tokelau
TK
Tonga
TO
Trinidad and Tobago
TT
Tunisia
TN
Turkmenistan
TM
Turks and Caicos Islands (the)
TC
Turkey
TR
Tuvalu
TV
Ukraine
UA
Uruguay
UY
Vanuatu
VU
Venezuela (Bolivarian Republic of)
VE
Virgin Islands (British)
VG
Virgin Islands (U.S.)
VI
Viet Nam
VN
Wallis and Futuna
WF
Yemen
YE
Zambia
ZM
Zimbabwe
ZW
