U.S. citizens may enter Portugal for up to 90 days for tourism or business without a visa. Your passport should be valid for at least three months beyond the period of stay.
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North Americans are welcome to visit Portugal for up to 90 days as tourists, but if you fall in love with the country and wish to remain longer, you'll need to apply for a long-stay residency visa. The process is straightforward and begins in your home country.
US citizens may enter Portugal for up to 90 days for business or for tourism without the need for a Portuguese visa. If you would like to move to Portugal and spend more than three months there, then you'll need to get an appropriate visa or a residence permit.
Where do American expats live in Portugal? Expat life in Portugal is a dream. The biggest American expat communities are Lisbon, the Algarve, and Porto. Compared to some other European countries, Portugal manages to balance a high quality of life with a low cost of living.