Canada (all 10 provinces and all 3 territories), Greenland, Mexico, United States of America (24 of its 50 states).

Central America (7/7)

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

The Caribbean (26/26)

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

South America (13/13)

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 (48/51)

Albania, Andorra, Austria, Belgium, Bosnia & Herzegovina, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark (including the Faroe Islands and Greenland), England, Estonia, European Collectivity of Alsace, Finland, France (including various territories listed elsewhere), Germany, Greece, Guernsey, Holy See (Vatican), Hungary, Iceland, Ireland, Italy (including Sardinia and Sicily), Kosovo, Latvia, Liechtenstein, Lithuania, Luxembourg, Madeira, 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, Wales.

Missing: Belarus, Moldova, Ukraine.

The Middle East (15/19)

Armenia, Azerbaijan, Bahrain, Georgia, Israel, Jordan, Kuwait, Northern Cyprus, Oman, Palestine, Qatar, Saudi Arabia, Syria, Türkiye, United Arab Emirates.

Missing: Iran, Iraq, Lebanon, Yemen.

Africa (32/57)

Angola, Botswana, Cameroon, Cape Verde, Central African Republic, Egypt, Equatorial Guinea, Eswatini, Ethiopia, Gabon, Ghana, Ivory Coast, Kenya, Lesotho, Madagascar, Malawi, Mauritius, Mayotte, Morocco, Mozambique, Namibia, Réunion, São Tomé and Principe, Senegal, Seychelles, South Africa, Tanzania, Togo, Tunisia, Zambia, Zanzibar, Zimbabwe.

Missing: Algeria, Benin, Burkina Faso, Burundi, Chad, Comoros, Democratic Republic of Congo, Djibouti, Eritrea, Gambia, Guinea, Guinea-Bissau, Liberia, Libya, Mali, Mauritania, Niger, Nigeria, Republic of Congo, Rwanda, Sierra Leone, Somalia, South Sudan, Sudan, Uganda.

Asia (25/34)

Cambodia, China, Hong Kong, India, Indonesia, Japan, Kazakhstan, Kyrgyzstan, Macau, Malaysia, Maldives, Mongolia, Nepal, Pakistan, Philippines, Republic of Korea (including the DMZ), Russia, Singapore, Sri Lanka, Taiwan, Tajikistan, Thailand, Turkmenistan, Uzbekistan, Vietnam.

Missing: Afghanistan, Bangladesh, Bhutan, Brunei, Burma/Myanmar, Laos, North Korea, Tibet, Timor-Leste.

Australasia and Oceania (8/17)

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

Missing: Kiribati, Marshall Islands, Micronesia, Nauru, Palau, Papua New Guinea, Samoa, Solomon Islands, Tuvalu.

Antarctica (2/4)

Antarctic Peninsula, South Shetland Islands.

Missing: Falkland Islands, South Georgia.

Totals

Total so far according to the above list: 180/232

From the above list of countries visited, the following are members of the 193 United Nations:

Albania, Andorra, Angola, Antigua and Barbuda, Argentina, Armenia, Australia, Austria, Azerbaijan, Bahamas, Bahrain, 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, Cyprus, Czechia, Denmark, Dominica, Dominican Republic, Ecuador, Egypt, El Salvador, Equatorial Guinea, Estonia, Eswatini, Ethiopia, Fiji, Finland, France, Gabon, Georgia, Germany, Ghana, Greece, Grenada, Guatemala, Guyana, Haiti, Honduras, Hungary, Iceland, India, Indonesia, Ireland, Israel, Italy, Jamaica, Japan, Jordan, Kazakhstan, Kenya, Korea (Republic of), Kuwait, Kyrgyzstan, Latvia, Lesotho, Liechtenstein, Lithuania, Luxembourg, Madagascar, Malawi, Malaysia, Maldives, Malta, Mauritius, Mexico, Monaco, Mongolia, 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, Tajikistan, Tanzania (United Republic of), Thailand, Togo, Tonga, Trinidad and Tobago, Tunisia, Türkiye, Turkmenistan, United Arab Emirates, United Kingdom of Great Britain and Northern Ireland, United States of America, Uruguay, Uzbekistan, Vanuatu, Venezuela, Viet Nam, Zambia, Zimbabwe.

Consequently, I have visited a total of 144 United Nations member countries.

Still To Go

Afghanistan, Algeria, Bangladesh, Belarus, Benin, Bhutan, Brunei Darussalam, Burkina Faso, Burundi, Chad, Comoros, Congo, Democratic People's Republic of Korea, Democratic Republic of the Congo, Djibouti, Eritrea, [Falkland Islands], Gambia, Guinea, Guinea Bissau, Iran, Iraq, Kiribati, Lao People's Democratic Republic, Lebanon, Liberia, Libya, Mali, Marshall Islands, Mauritania, Micronesia, Moldova (Republic of), Myanmar, Nauru, Niger, Nigeria, Palau, Papua New Guinea, Rwanda, Samoa, Sierra Leone, Solomon Islands, Somalia, [South Georgia], South Sudan, Sudan, [Tibet], Timor-Leste, Tuvalu, Uganda, Ukraine, Yemen. Total: 52.