Markle, who was born in California, and Prince Harry now reside in Montecito, California after stepping back from their royal duties at the start of 2020.
The two have been urging Americans to vote throughout the year. Royal protocol dictates that while they are not legally 'banned' from voting in British elections, but they are expected to stay apolitical.
Back in August, Markle spoke to Marie Claire U.S. about why she plans to vote in this election and why it's so important to her.
"I know what it’s like to have a voice and also what it’s like to feel voiceless," she said.
"I also know that so many men and women have put their lives on the line for us to be heard. And that opportunity, that fundamental right, is in our ability to exercise our right to vote and to make all of our voices heard."
She concluded with: "One of my favourite quotes, and one that my husband I have referred to often, is from Kate Sheppard, a leader in the suffragist movement in New Zealand, who said, 'Do not think your single vote does not matter much. The rain that refreshes the parched ground is made up of single drops.' That is why I vote."