The Democratic candidate was ahead by more than 1.7 million votes as of Monday morning.
According to the Cook Political Report, Clinton's total is, thus far, 63,620,704. Trump's tally lags behind at 61,900,651.
Unfortunately for Clinton supporters – and to the benefit of those backing Trump – the popular vote lead comes from non-swing states.
In the ones that ended up weighing most heavily, such as Florida, Ohio, Pennsylvania, and Wisconsin, Trump leads by approximately 860,400 votes.
See photos from Clinton's concession speech:
There's also the matter of the Electoral College, which ultimately declares the winner based on the votes cast in each state.
Donald Trump was once a vocal critic of the system, calling it a "disaster for democracy."
His opinion has since changed. Trump recently declared, "The Electoral College is actually genius in that it brings all states, including the smaller ones, into play."
RELATED: Here's the best Clinton swag to buy to show you're #stillwithher: