Age, race, gender and education are all big dividing points in the presidential race, with polling showing that men and whites are backing Trump while women and ethnic minorities support Clinton.
Race has always been a huge dividing line in the US election, and the clash between Trump and Clinton is no different. Just 17 per cent of Hispanics and three per cent of black people back Trump, according to recent polling.
This could prove significant in this election. For example, Hispanics account for more than a fifth of the population in four key swing states.
Education is another big demographic division in the race – and there's a reason why Trump said he "loved the poorly educated".
Among high school graduates or those with a lower level of education, Trump has the backing of 44% – compared to the 36% who support Clinton.
This could prove significant in the swing states of Georgia and Nevada, which both have a high proportion of people failing to graduate from high school.
We've mapped out each candidate's road to the White House here and you can keep up with what to look out for in the US Senate and House of Representatives elections with our handy guide.