In his letter, Trump thanked commander Walter Schlegel for his “hard work and assistance” during the huge networking event-cum-party at the popular ski resort.
"Something that doesn't happen every year," said the force of the letter in their social media post.
"Whether it's the US president or not, we stand for the safety of everyone in Graubünden and therefore say: 'You're welcome," the post concluded.
Donald Trump's visit to the WEF – the first by a US president since Bill Clinton showed up in the alpine resort in 2000 – was a fraught affair marked by demonstrations and ideological tensions.
Before the arrival of POTUS, an estimated 1,000 people marched in Zurich chanting "Trump not welcome", with some carrying banners and placards reading "dump the Trump" and "Switzerland is hosting Nazis". Smaller demonstrations were held in other Swiss cities.
Meanwhile, in Davos itself, which goes into virtual lock-down during the WEF, Trump's appearance was greeted with boos from the audience after he insulted the press.
But concerns his American First philosophy might clash in dramatic ways with the cooperative ethos at the WEF proved largely unfounded as the president used his speech to link the fates of the US and the world and suggest the rest of the world "become part of this incredible future we are building together".