Which city, at roughly 3,640 m above sea level, is the world's highest seat of national government?

Explication

La Paz hosts Bolivia's president and legislature in a canyon around 3,640 m up, roughly 800 m higher than Quito, the closest rival on this list. Its neighbour El Alto, spread across the plateau above the canyon rim, has one of the world's highest international airports at about 4,060 m — high enough that aircraft need a noticeably longer runway to get airborne.