Killingly High School

Killingly High School is a middle-of-the-pack secondary school in Dayville, Connecticut, operated by Killingly School District. The school caters to 744 students in grades 9 through 12.

Across the 4 schools in Killingly School District (2,238 students total), Killingly High School accounts for its share of the district's footprint.

Looking at the student body, Killingly High School lists that 77% of the student body identifies as White. Beyond that, the school lists 13% Hispanic, 5% multiracial, 3% Black. That is visibly less White than the county at large, where the share is closer to 87%.

Looking at school resources, Killingly High School reports 67 full-time-equivalent teachers, putting the student-to-teacher ratio at about 11.1:1. Statewide, the average ratio sits near 12.3:1, putting Killingly High School tighter than the state norm the norm. Around 43% of the student body qualifies for free or reduced-price meals, often used as a Title I proxy.

Zooming out to the county, the surrounding county (Northeastern Connecticut Planning Region) shows that median household earnings sit near $90,589, roughly 26% of adults have completed at least a four-year degree, and census figures put the poverty rate at about 5%. In all, Northeastern Connecticut Planning Region runs 34 public schools (combined enrollment of about 11,909 students), of which Killingly High School is one.

Nearest neighbor: Killingly Central School, around 0.9 miles off. Within five miles, there are 7 other public schools.

Killingly High School operates from a countryside location.

Looking at the recent track record. Over the past 7-year window, the student count decreased 7%: 802 students in 2018 compared to 744 in 2025. Over the same period, the Hispanic share ticked up from 7% to 13%.

On allk12, posts here usually surface around classroom updates, athletics, and weather closures. The community welcomes input from current and former families.