636 Area Code 🌍☎️

Saint Charles is the eighth-most populous city in Missouri with 70,493 residents at the 2020 census and serves as the county seat of St. Charles County, located on the Missouri River near its confluence with the Mississippi River as a northwestern suburb of St. Louis. Founded circa 1769 by French-Canadian fur trader Louis Blanchette as Les Petites Côtes, it is the third-oldest city in Missouri and was settled primarily by French-speaking colonists from Canada. The city served as Missouri's first capital from 1821 to 1826 and played a crucial role in westward expansion as a river port and the starting point of the Boone's Lick Road and Santa Fe Trail. In 1804, the Lewis and Clark Expedition designated St. Charles as the last "civilized" settlement before embarking upriver to explore territory acquired in the Louisiana Purchase. The city is also home to the Saint Rose Philippine Duchesne Catholic shrine, established in the 20th century. Chesterfield is a western suburb of St. Louis in St. Louis County, Missouri, with a 2020 census population of 49,999, making it the state's 14th most populous city. The area, originally called "Gumbo Flats" for its distinctive silty soil, was inhabited by Native Americans for thousands of years, including a Mississippian ceremonial and market center dating to around 1000 CE. The modern city was formed from several historical communities established in the mid-to-late 1800s - including Bellefontaine (founded 1837), Lake (originally "Hog Hollow," circa 1850), Gumbo, Monarch, and Bonhomme - each with their own post offices and local landmarks. On January 24, 1967, an F4 tornado struck the area, creating a 21-mile path of destruction across St. Louis County and ranking as the fourth-worst tornado in the metro area's history. The city took its name from landowner Justus Post, who arrived in Missouri in 1815 and began developing an estate in the present-day Chesterfield location. O'Fallon is a city in St. Charles County, Missouri, with a population of 91,316 as of the 2020 census, making it the seventh-most populous city in the state and the largest suburb of St. Louis. Founded in 1856 by Nicholas Krekel and incorporated in 1912, the city was named after John O'Fallon, president of the North Missouri Railroad. Situated along Interstates 64 and 70 across 30.51 square miles, O'Fallon has grown into a major commercial center, with Mastercard operating a large campus there and Air Evac Lifeteam headquartered in the city since 2015. Notable landmarks include Fort Zumwalt Park, home to a historic fort, and CarShield Field, a baseball stadium opened in 1999. O'Fallon has been repeatedly ranked among Money magazine's best places to live in the United States and in 2007 became Missouri's first internationally accredited fire agency.