Asian Development Bank

64 countries are members.

Country
Afghanistan
Armenia
Australia
Austria
Azerbaijan
Bangladesh
Belgium
Bhutan
Brunei
Cambodia
Canada
Denmark
Federated States of Micronesia
Fiji
Finland
France
Germany
India
Indonesia
Ireland
Italy
Japan
Kazakhstan
Kingdom of the Netherlands
Kiribati
Kyrgyzstan
Laos
Luxembourg
Malaysia
Maldives
Marshall Islands
Mongolia
Myanmar
Nauru
Nepal
New Zealand
Norway
Pakistan
Palau
Papua New Guinea
People's Republic of China
Philippines
Portugal
Samoa
Singapore
Solomon Islands
South Korea
Spain
Sri Lanka
Sweden
Switzerland
Taiwan
Tajikistan
Thailand
Timor-Leste
Tonga
Turkey
Turkmenistan
Tuvalu
United Kingdom
United States
Uzbekistan
Vanuatu
Vietnam