Francis Howell Union High
O'Fallon, Missouri
High School, Grades 9–12
#9
Best ACT in Missouri High Schools
0:1
S:T Ratio
School Snapshot
Key metrics at a glanceAvg ACT Scoreout of 36
25
A-
Good
Graduation Rate
97%
A+
Excellent
This Week at Francis Howell Union High – April 20, 2026
110 students practicing on Varsity Tutors
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School Details
Address
801 Corporate Centre Drive, O'Fallon, MO 63368
Phone
(636)851-5000
Website
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District
Francis Howell School District
Academic Calendar
2025-2026
Important dates, holidays, and school events