Canada (all 10 provinces and all 3 territories), USA, Mexico, Greenland.

Central America

Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama.

The Caribbean

Antigua and Barbuda, Aruba, Bahamas, Barbados, Bermuda, Bonaire, British Virgin Islands, Cayman Islands, Cuba, Curação, Dominica, Dominican Republic, Grenada, Haiti, Jamaica, Martinique, Nevis, Puerto Rico, Saint Barthélemy, Saint Kitt's, Saint Lucia, Saint Martin, Sint Maarten, Saint Vincent and the Grenadines, Tobago, Trinidad, Turks & Caicos, U.S. Virgin Islands.

South America

Argentina, Bolivia, Brazil, Chile (including Easter Island), Colombia, Ecuador (including the Galapagos Islands), French Guiana (including the Salvation Islands), Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela.

Europe

Albania, Andorra, Austria, Belgium, Bosnia-Herzegovina, Bulgaria, Croatia, Czech Republic, Denmark (including Faroe Islands and Greenland), England (including the Channel Islands), Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy (including Sardinia and Sicily), Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Monaco, Montenegro, Netherlands, North Macedonia, Northern Ireland, Norway (including Svalbard), Poland, Portugal (including Madeira), Romania, San Marino, Scotland, (including the Orkney and Shetland Islands), Serbia, Slovakia, Slovenia, Spain (including the Canary Islands), Sweden, Switzerland, Türkiye, Vatican, Wales.

Africa

Angola, Botswana, Cabo Verde, Cameroon, Central African Republic, Côte d'Ivoire, Egypt, Equatorial Guinea, Eswatini, Ethiopia, Gabon, Ghana, Kenya, Lesotho, Madagascar, Malawi, Mauritius, Mayotte, Morocco, Mozambique, Namibia, Rénion, Senegal, Seychelles, São Tomé and Principe, South Africa, Tanzania, Togo, Tunisia, Zambia, Zimbabwe.

The Middle East

Israel, Jordan, Oman, Palestine, Qatar, Saudi Arabia, Syria, United Arab Emirates.

Asia

Cambodia, China, Hong Kong, India, Indonesia, Japan, Macau, Malaysia, Maldives, Nepal, Pakistan, Philippines, Russia, Singapore, Sri Lanka, Taiwan, Thailand, Vietnam.

Australasia and the South Pacific

Australia, Fiji, French Polynesia, New Caledonia, New Zealand, Pitcairn Island, Tonga, Vanuatu.

Antarctica

Antarctic Peninsula, South Shetland Islands.

Total so far according to the above list: 163

From the above list of countries visited, the following are members of the 193 United Nations: Albania, Andorra, Angola, Antigua and Barbuda, Argentina, Australia, Austria, Bahamas, Barbados, Belgium, Belize, Bolivia, Bosnia and Herzegovina, Botswana, Brazil, Bulgaria, Cabo Verde, Cambodia, Cameroon, Canada, Central African Republic, Chile, China, Colombia, Costa Rica, Côte d'Ivoire, Croatia, Cuba, Czechia, Denmark, Dominica, Dominican Republic, Ecuador, Egypt, El Salvador, Equatorial Guinea, Estonia, Eswatini, Ethiopia, Fiji, Finland, France, Gabon, Germany, Ghana, Greece, Grenada, Guatemala, Guyana, Haiti, Honduras, Hungary, Iceland, India, Indonesia, Ireland, Israel, Italy, Jamaica, Japan, Jordan, Kenya, Latvia, Lesotho, Liechtenstein, Lithuania, Luxembourg, Madagascar, Malawi, Malaysia, Maldives, Malta, Mauritius, Mexico, Monaco, Montenegro, Morocco, Mozambique, Namibia, Nepal, Netherlands, New Zealand, Nicaragua, North Macedonia, Norway, Oman, Pakistan, Panama, Paraguay, Peru, Philippines, Poland, Portugal, Qatar, Romania, Russian Federation, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, San Marino, Saudi Arabia, Senegal, Serbia, Seychelles, Singapore, Slovakia, Slovenia, São Tomé and Principe, South Africa, Spain, Sri Lanka, Suriname, Sweden, Switzerland, Syrian Arab Republic, Thailand, Togo, Tonga, Trinidad and Tobago, Tunisia, Türkiye, United Arab Emirates, United Kingdom of Great Britain and Northern Ireland, United Republic of Tanzania, United States of America, Uruguay, Vanuatu, Venezuela, Viet Nam, Zambia, Zimbabwe.

Consequently, I have visited a total of 131 United Nations member countries.

Still to go: Afghanistan, Algeria, Armenia, Azerbaijan, Bahrain, Bangladesh, Belarus, Benin, Bhutan, Brunei Darussalam, Burkina Faso, Burundi, Chad, Comoros, Congo, Cyprus, Democratic People's Republic of Korea, Democratic Republic of the Congo, Djibouti, Eritrea, Gambia, Georgia, Guinea, Guinea Bissau, Iran, Iraq, Kazakhstan, Kiribati, Kuwait, Kyrgyzstan, Lao People's Democratic Republic, Lebanon, Liberia, Libya, Mali, Marshall Islands, Mauritania, Micronesia, Mongolia, Myanmar, Nauru, Niger, Nigeria, Palau, Papua New Guinea, Republic of Korea, Republic of Moldova, Rwanda, Samoa, Sierra Leone, Solomon Islands, Somalia, South Sudan, Sudan, Tajikistan, Timor-Leste, Turkmenistan, Tuvalu, Uganda, Ukraine, Uzbekistan, Yemen. Total: 62.