Estimates vary widely, but there are somewhere between 4 and 8 million U.S. citizens living overseas.
So what does the race for the White House look like from thousands of miles away?
Three Americans shared their thoughts from the UK, Australia and the United Arab Emirates:
Ted Cardos is originally from Kansas City, Missouri and now lives in London, England
Leslie White was born in Houston, Texas and now calls Melbourne, Australia home
Steven Anderson is from Santa Barbara, California and splits his time between Europe and the United Arab Emirates.
How do people overseas view the 2016 presidential election?
"Talking with friends in the U.K. the view of the U.S. presidential election is one of deep foreboding. People are very much absolutely obsessed with the U.S. election, and the things that they've been interested in talking about have been very different from before Brexit as opposed to after Brexit."
"In the United Arab Emirates, people find the whole election process and the fact that it has taken so long, comical, to say the least. There are concerns here and there, but when they speak with me they have a big smile on their face and find it quite interesting."
"When people hear that I'm American ... everyone asks me 'what is going on with the election?' 'How has Donald Trump got this far? This is completely ridiculous.'"
On the candidates
"I have been involved with in the GOP since Richard Nixon in 1972. In the last 25 years I've been very despondent, and then I saw Donald [Trump] come in and say he's Mr. Anti-establishment. He represented all of the people that had views similar to my own that lost hope in Washington, whether Republican or Democrat. So I was one of the people that wanted Trump and was cheering for him from the beginning, because I didn't like anyone else."
"I voted already and I voted for Jill Stein. I left the US in 2010 and a big part of that is that I didn't feel represented by my government. I wanted basic human rights that I thought the United States government was never going to come around to giving like healthcare and education ... Jill Stein is much more in line with values that are important to me."
Plans for election day
"I've already voted ... on Election Day I hope and plan to stay up as late as I can to watch the results as they come in. I guess if I could stay up late to watch the Royals win the World Series, I can stay up for the election."