St. Louis, an independent city (not part of any county) in eastern Missouri, anchors the 20th-largest U.S. metropolitan area (2.9 million, bi-state).
Perched on the Mississippi River's western bank, directly opposite Illinois. The Gateway Arch (1965), a 630-foot stainless steel catenary arch, symbolizes the city's historic role as "Gateway to the West" for 19th-century expansion.
City proper: ~300,000 (59th nationally), down from 856,000 peak (1950). Metro: 2.8–2.9M across Missouri/Illinois counties. Significant population decline reflects suburbanization and industrial restructuring.
Healthcare (BJC, SSM, Mercy), biotech (Corteva, Donald Danforth Center), finance (Stifel, Wells Fargo Advisors), logistics (rail/river/truck nexus), brewing (Anheuser-Busch headquarters), and growing geospatial intelligence (NGA West campus).
Forest Park (1,371 acres—larger than Central Park) hosts world-class free institutions: Art Museum, Zoo, Science Center, History Museum, Muny Opera. Distinctive cuisine: toasted ravioli, gooey butter cake, St. Louis-style pizza (Provel cheese, cracker-thin crust). Baseball devotion (Cardinals) borders on civic religion.
Racial segregation (Delmar Divide), violent crime concentration, vacant property, and fragmented governance (city + 90+ municipalities in St. Louis County) complicate revitalization.