The most populous cities in area code 636 are: O Fallon, Saint Peters, Saint Charles, Chesterfield, and Wildwood.
Other cities in the 636 area code include: Wentzville, Ballwin, Maryland Heights, Saint Ann, Arnold, Washington, Earth City, Troy, Union, Eureka, Warrenton, Valley Park, De Soto, Crystal City, Saint Clair, Imperial, Fenton, Herculaneum, High Ridge, Wright City, Hillsboro, Gray Summit, House Springs, Moscow Mills, New Haven, Cedar Hill, Winfield, Marthasville, Jonesburg, Hawk Point, Foristell, Portage Des Sioux, Augusta, Old Monroe, High Hill, Defiance, Foley, Fletcher, Pacific, Saint Louis, and Truxton.
O'Fallon / oʊ ˈ f æ l ən / is a city along Interstate 70 and Interstate 64 between Lake St. Louis and St. Peters in St. Charles County, Missouri. It is part of the St. Louis Metropolitan Statistical Area. As of the 2010 census O'Fallon had a population of 79,329, making it the largest municipality in St. Charles County and seventh largest in the state of Missouri. In 2006 Money Magazine named O'Fallon 39th in its "Best 100 Places to Live." Money Magazine also ranked O'Fallon 68th out of 100 in 2008 and 26th out of 100 in 2010. O'Fallon's namesake in St. Clair County, Illinois is also part of the St. Louis Metropolitan Statistical Area. The two O'Fallons are one of the few pairs of same-named municipalities to be part of the same MSA.
St. Peters is a city in St. Charles County, Missouri, United States. The 2010 census showed the city's population to be 52,575 tied for 10th with Blue Springs, Missouri.Interstate 70 passes through the city, providing a major transportation link. In 2008 St. Peters was named the 60th best place to live by Money magazine, putting it at the top in the state of Missouri. It also ranked in Money magazine's Top 100 in 2010 and 2012.The "Rec-Plex" in St. Peters is an award-winning recreation and fitness complex that underwent an $18.5 million expansion in 2007. The city also hosts the county's largest shopping center, Mid Rivers Mall, which plans a 120,000 sq ft (11,000 m 2) expansion.
St. Charles is a city in, and the county seat of, St. Charles County, Missouri, United States. The population was 65,794 at the 2010 census, making St. Charles the ninth-largest city in Missouri. It lies to the northwest, and is a suburb of St. Louis, Missouri on the Missouri River.Founded in about 1769 as Les Petites Côtes, or "The Little Hills" in French, by Louis Blanchette, a French-Canadian fur trader, when the area was nominally ruled by Spain following the Seven Years' War, it is the third-oldest city in Missouri. For a time, it played a significant role in the United States' westward expansion.It was settled primarily by French-speaking colonists from Canada in its early days and was considered the last "civilized" stop by the Lewis and Clark Expedition in 1804, which was exploring the western territory after the United States made the Louisiana Purchase. The city served as the first Missouri capital from 1821 to 1826, and is the site of the Saint Rose Philippine Duchesne shrine.
The 636 area code lies within the Central Daylight Time Zone (or CDT). The current time in Central Daylight Time is 2:35 PM on Apr 20, 2021.
