Loudoun County, Virginia encompasses the northernmost portion of the state, on the outskirts of the Washington, DC metro area. This pair of maps from José Manrique (@JoseManrique93) shows President Joe Biden improving on President Barack Obama's re-election numbers by ten points, and President Donald Trump under-performing now-Senator Mitt Romney by even more than that. They say:
The more suburban part of Loudoun County, VA (i.e. the precincts to the southeast) was already voting Democratic back in 2012, but the margins Biden got in that area were just overwhelming. Trump received less than 40% in almost every precinct of said area in 2020. pic.twitter.com/2ksZPypybS
— José Manrique (@JoseManrique93) May 17, 2021
This populous county swinging toward Democrats is one of a few reasons why Virginia is trending blue. I personally find it interesting how Republican support has noticeably collapsed near the geographical center of the county.