Castlio Address: 1020 Dingledine Road, St Charles, MO 63304
School phone: 636-851-4300
School fax: 636-851-4099
Reporting a student absence: Call 636-851-4300
Contacting a teacher:
- Find out the teacher's extension in the Staff Directory.
- Dial 636-851, followed by the extension.
- If the teacher is not available, leave a message on their voice mail.