As a citizen of United States you can enter Japan without a Visa and stay up to 90 days.

As a citizen of United States you must get an Electronic Visa before you enter Vietnam.

As a citizen of United States you can enter Thailand without a Visa and stay up to 30 days.

You may need a yellow fever vaccination to enter Thailand: Proof of vaccination against yellow fever is required for travellers aged 9 months or over arriving from countries with risk of yellow fever transmission, and for travellers having transited for more than 12 hours through an airport of a country with risk of yellow fever transmission.

As a citizen of United States you will receive a Visa when you first arrive in Cambodia.

You may need a yellow fever vaccination to enter Cambodia: Proof of vaccination against yellow fever is required for travellers aged 1 year or over arriving from countries with risk of yellow fever transmission, and for travellers having transited for more than 12 hours through an airport of a country with risk of yellow fever transmission.

As a citizen of United States you must get an Visa at the Embassy before your trip to enter China.

You may need a yellow fever vaccination to enter China: Proof of vaccination against yellow fever is required for travellers aged 9 months or over arriving from countries with risk of yellow fever transmission, and for travellers having transited for more than 12 hours through an airport of a country with risk of yellow fever transmission.

As a citizen of United States you can enter Singapore without a Visa and stay up to 90 days.

You may need a yellow fever vaccination to enter Singapore: proof of vaccination against yellow fever is required for travellers aged 1 year or over, arriving from countries at risk for yellow fever transmission, and for travellers having transited for more than 12 hours through an airport of countries at risk for yellow fever transmission.

As a citizen of United States you can enter South Korea without a Visa and stay up to 90 days.

As a citizen of United States you will receive a Visa when you first arrive in Indonesia.

You may need a yellow fever vaccination to enter Indonesia: Proof of vaccination against yellow fever is required for travellers aged 9 months or over arriving from countries with risk of yellow fever transmission.

As a citizen of United States you must get an Electronic Visa before you enter Vietnam.

As a citizen of United States you will receive a Visa when you first arrive in Indonesia.

You may need a yellow fever vaccination to enter Indonesia: Proof of vaccination against yellow fever is required for travellers aged 9 months or over arriving from countries with risk of yellow fever transmission.

As a citizen of United States you will receive a Visa when you first arrive in Laos.

As a citizen of United States you can enter Malaysia without a Visa and stay up to 90 days.

You may need a yellow fever vaccination to enter Malaysia: Proof of vaccination against yellow fever is required for travellers aged 1 year or over arriving from countries with risk of yellow fever transmission, and for travellers having transited for more than 12 hours through an airport of a country with risk of yellow fever transmission.

As a citizen of United States you must get an Visa at the Embassy before your trip to enter China.

You may need a yellow fever vaccination to enter China: Proof of vaccination against yellow fever is required for travellers aged 9 months or over arriving from countries with risk of yellow fever transmission, and for travellers having transited for more than 12 hours through an airport of a country with risk of yellow fever transmission.

As a citizen of United States you can enter South Korea without a Visa and stay up to 90 days.

As a citizen of United States you must get an Visa at the Embassy before your trip to enter China.

You may need a yellow fever vaccination to enter China: Proof of vaccination against yellow fever is required for travellers aged 9 months or over arriving from countries with risk of yellow fever transmission, and for travellers having transited for more than 12 hours through an airport of a country with risk of yellow fever transmission.

As a citizen of United States you must get an Electronic Visa before you enter India.

You may need a yellow fever vaccination to enter India: Anyone (except infants up to the age of 9 months) arriving by air or sea without proof of vaccination against yellow fever is detained in isolation for up to 6 days if that person (i) arrives within 6 days of departure from an area with risk of yellow fever transmission, or (ii) has been in such an area in transit (except those passengers and members of the crew who, while in transit through an airport situated in an area with risk of yellow fever transmission, remained within the airport premises during the period of their entire stay and the Health Officer agrees to such exemption), or (iii) arrives on a ship that started from or touched at any port in an area with risk of yellow fever transmission up to 30 days before its arrival in India, unless such a ship has been disinsected in accordance with the procedure laid down by WHO, or (iv) arrives on an aircraft that has been in an area with risk of yellow fever transmission and has not been disinsected in accordance with the Indian Aircraft Public Health Rules, 1954, or as recommended by WHO. Countries and areas regarded as having risk of yellow fever transmission are, in Africa: Angola, Benin, Burkina Faso, Burundi, Cameroon, Central African Republic, Chad, Congo, Côte dʼIvoire, Democratic Republic of the Congo, Equatorial Guinea, Ethiopia, Gabon, Gambia, Ghana, Guinea, Guinea-Bissau, Kenya, Liberia, Mali, Mauritania, Niger, Nigeria, Rwanda, Senegal, Sierra Leone, South Sudan, Sudan, Togo and Uganda; and in the Americas: Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Panama, Paraguay, Peru, Suriname, Trinidad and Tobago (Trinidad only) and Venezuela (Bolivarian Republic of). Note: When a case of yellow fever is reported from any country, that country is regarded by the Government of India as a country with risk of yellow fever transmission and is added to the above list.