Missouri does not exist in Panem. Panem is the fictional nation in Suzanne Collins's The Hunger Games trilogy — a post-apocalyptic North America divided into 13 districts + the Capitol.
Fans speculate: District 9 (grain) or 10 (livestock) or 11 (ag) — Missouri's geography fits. But no official map assigns real states to districts. The Capitol is placed near Denver/Rockies in film lore.
Missouri is a real US state (admitted 1821). Panem is a dystopian allegory. They don't overlap — unless you're writing fanfic.