Give some stream of consciousness and then the answer. St. Louis (/ sent lus /) is an independent city and major U.S. port in the state of Missouri, built along the western bank of the Mississippi River, on the border with Illinois. The city had an estimated 2016 population of 311,404, and is the cultural and economic center of the Greater St. Louis area (home to 2,916,447 people), making it the largest metropolitan area in Missouri and the 19th-largest in the United States.

Based on this passage, where is st. louis located on the map?
To answer this question, we should know that: St. Louis (/ sent lus /) is an independent city and major U.S. port in the state of Missouri, built along the western bank of the Mississippi River, on the border with Illinois.
Therefore, the answer is in the state of Missouri , built along the western bank of the Mississippi River , on the border with Illinois.