11. # of countries with red in their flags:
89
Albania, Austria, Bahrain, Canada, Denmark, England, Georgia, Greenland, Indonesia, Japan, Latvia, Monaco, Poland, Switzerland, Singapore, Tonga, Turkey, Tunisia, Peru, Qatar, Malta, Trinidad and Tobago, Yemen, Algeria, Belarus, Bulgaria, Burundi, Hungary, Iran, Italy, Lebanon, Madagascar, Maldives, Mexico, Oman, Wales, Bhutan, China, Kyrgyzstan, Macedonia, Montenegro, Spain, Vietnam, Angola, Belgium, Germany, Brunei, Egypt, Timor-Leste, Uganda, Bangladesh, Morocco, Malawi, Zambia, Afghanistan, Iraq, Jordan, Kenya, Kuwait, Libya, Palestine, Sudan, Syria, United Arab Emirates, Benin, Bolivia, Burkina Faso, Cameroon, Republic of the Congo, Grenada, Guinea, Lithuania, Mali, Senegal, Ghana, São Tomé and Príncipe, Vanuatu, Sri Lanka, Myanmar, Suriname, Tajikistan, Togo, Turkmenistan, Guyana, Mozambique, Saint Kitts and Nevis, Zimbabwe, Dominica
Sorry, this is surely wrong. Just a few countries which are missing from your list: USA, Russia, Norway, Czech Republic, Slovakia, Slovenia, Croatia, Serbia, Chile, France, the Netherlands, Azerbaijan, Ethiopia, Romania, Moldova, Chad, Andorra, Namibia...