St. Charles County
- Francis Howell R-III School District - St. Peters
- Francis Howell High School - Weldon Spring Heights
- Francis Howell North High School - St. Peters
- Francis Howell Central High School - Cottleville
- Francis Howell Union High School - St. Charles
- Fort Zumwalt R-II School District - O'Fallon
- Fort Zumwalt North High School - O'Fallon
- Fort Zumwalt South High School - St. Peters
- Fort Zumwalt East High School - St. Peters
- Fort Zumwalt West High School - O'Fallon
- Hope High School - O'Fallon
- Orchard Farm R-V School District - St. Charles
- Orchard Farm High School
- St. Charles R-VI School District - St. Charles
- St. Charles High School
- St. Charles West High School
- Wentzville R-IV School District - Wentzville
- Emil E. Holt High School
- Timberland High School
- Barat Academy - O'Fallon - Roman Catholic (Co-Ed)
- Church on the Rock Christian School - St. Peters - Nondenominational Christianity (Co-Ed)
- Duchesne High School - St. Charles - Roman Catholic (Co-Ed)
- Liberty Classical School - O'Fallon - Nondenominational Christianity (Co-Ed)
- Living Word Christian Schools - O'Fallon - Nondenominational Christianity (Co-Ed)
- Lutheran High School of St. Charles County - St. Peters - Lutheran (Co-Ed)
- St. Dominic High School - O'Fallon - Roman Catholic (Co-Ed)
Read more about this topic: List Of High Schools In Missouri
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—Henry David Thoreau (1817–1862)