Haddam-Killingworth High School
| Name | Haddam-Killingworth High School |
| Grades | Class 09 to Class 12 |
| Address | 95 Little City Road |
| City | Higganum |
| School District | Regional School District 17 |
| County | Middlesex County |
| Zipcode | 06441-0568 |
| Phone No. | (860)345-8541 |
| State | Connecticut |
| Rural | Fringe |
| Students | 615 |
| Teachers | 54 |
| Student Teacher Ratio | 11.4 students per teacher |
| Charter School | No |
| Magnet School | No |
Haddam-Killingworth High School is located at 95 Little City Road in Higganum city of Middlesex County county in Connecticut. This school comes under Regional School District 17. You can call them at (860)345-8541 for more details. This is not a magnet school. Total six hundred fifteen students from class 09 to class 12 study in this school who are taught by fifty four teachers. This is not a charter school. The student teacher ratio of this school is 11.4.