Hillary Clinton won 487 counties despite winning the popular vote in 2016. But she lost the Electoral College so that doesn't matter.
Did Joe Biden win the fewest counties out of any winning presidential candidate? And how many counties did win?
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Prior to the 2020 election, the fewest counties won by a successful presidential candidate was 689, or 22.1%, by Barack Obama in 2012 (Source: NBC).
In 2020, Joe Biden won 538 of 3113 counties, or around 17.3%. Biden has, therefore, 'beaten' Obama's record.
Below is a county-level map showing the winner of each county, using data from Fox's feed.
The code & data used in this answer can be found on GitHub.
Another representation of the spread of county votes, but also accounting for population. It reveals that Biden had much fewer sparse counties, but many more populous counties.
2016 for comparison: Biden had fewer counties than Clinton, but a larger per capita of the population. Depending on what you're looking for, he had the least # of counties, but also the most populous counties in US history.