St. John Map
The City of St. John is located in St. Charles County in the State of Missouri. Find directions to St. John, browse local businesses, landmarks, get current traffic estimates, road conditions, and more. According to the 2019 US Census the St. John population is estimated at 6,319 people. The St. John time zone is Central Daylight Time which is 6 hours behind Coordinated Universal Time (UTC).
Nearby cities include Saint John, Breckenridge Hills, Woodson Terrace, Charlack, Schuermann Heights.