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Haddam-Killingworth High School

Q: Is Haddam-Killingworth High School a good school?

Haddam-Killingworth High School ranks 14 th of 135 Connecticut high schools. SchoolDigger rates this school 5 stars out of 5.

Public Grades 9-12

14^th

SchoolDigger Rank ?

of 135 Connecticut High Schools

Better than 90% of Connecticut high schools

Summary

Haddam-Killingworth High School is a public high school in Higganum, CT, serving 466 students in grades 9–12 as part of Regional School District 17. The school is a top performer in Connecticut, ranking 14th out of 133 high schools statewide (89th percentile) with a 5-star rating, and it has finished in the top 18 schools for three consecutive years.

Academically, Haddam-Killingworth High School excels in English Language Arts, with 85.3% of students proficient in 2025–2026 — roughly 30 points above the state average and higher than every nearby school, including East Hampton High School (81.2%) and Coginchaug Regional High School (77.5%). Science proficiency (74.8%) is also well above the state average, while math (48.8%) remains above average, though it is less dominant than literacy. The school posts a 97.6% graduation rate, the highest in the area, and chronic absenteeism sits at just 6.9% — far below the state average of 16.4% and the best among neighboring high schools.

With a student–teacher ratio of 9.5, HK offers a more intimate learning environment than larger schools like Middletown High School (11.7 ratio) or Cromwell High School (11.0). The school also serves a comparatively low percentage of economically disadvantaged students (13.7%), but it outperforms demographically similar schools — for instance, it beats Coginchaug Regional High School in ELA, graduation rate, and attendance. While math shows some year-to-year variability and outcomes for female students are notably stronger than for male students, HK's overall record is one of consistent, top-tier academic performance.

466

Students ?

9.5

Student/teacher ratio ?

$30,768

Per pupil spending ?

13.7%

Free/reduced lunch eligible (2024-25) ?

95 Little City Road
Higganum, CT 06441

(860) 345-8541

District: Regional School District 17

Feeder schools for Haddam-Killingworth High School:

Elementary:	Burr District Elementary School
	Haddam-Killingworth Intermediate School
	Killingworth Elementary School
Middle:	Haddam-Killingworth Middle School

Racial breakdown:

White:

87.8%

Hispanic:

4.9%

Two or more races:

3.4%

See top rated Connecticut high schools

Compare Haddam-Killingworth High School to nearby high schools!

At a glance

▲ Ranking trend: Improving — 76th percentile in 2013 → 90th in 2026

Strengths

✓Test scores above the Connecticut average (80% vs 46% meeting standards)

✓Ranks in the top 10% of Connecticut high schools

✓98% graduate in 4 years — above the Connecticut average (91%)

Worth a look

!Some student groups rank well below the school's overall statewide standing

Students meeting standards (2025-2026) ?

This school80%

District avg80%

Connecticut avg46%

14^th of 135

Connecticut public high schools ?

Top 10%▲ up 5 pts since 2016

From top 15% (2016) to top 10% (2026)

See the entire ranking list of Connecticut High Schools →

★★★★★

SchoolDigger rating ?

44^th of 153Regional School District 17 among Connecticut districts

Statewide rank percentile over time (100 = the top-ranked school in the state; click a legend item to add a student group)

Show full rank history (all student groups)

All Students

Year	Avg score	Statewide rank	Connecticut percentile	Rating
2026	88.9	14 of 135	89.6%	★★★★★
2025	88.4	16 of 141	88.7%	★★★★☆
2024	85.9	18 of 145	87.6%	★★★★☆
2023	92.5	9 of 142	93.7%	★★★★★
2022	70.1	46 of 139	66.9%	★★★☆☆
2021	85.7	31 of 200	84.5%	★★★★☆
2019	84.8	22 of 121	81.8%	★★★★☆
2016	86.6	20 of 132	84.8%	★★★★☆
2015	87.3	19 of 196	90.3%	★★★★★
2013	76.1	46 of 193	76.2%	★★★★☆
2012	72.1	68 of 188	63.8%	★★★☆☆
2011	73.4	67 of 189	64.6%	★★★☆☆
2010	75.7	40 of 186	78.5%	★★★★☆
2009	75.9	47 of 176	73.3%	★★★★☆
2008	74.7	47 of 176	73.3%	★★★★☆
2007	76.9	33 of 176	81.3%	★★★★☆

Female

Year	Avg score	Statewide rank	Connecticut percentile	Rating
2026	89.0	8 of 111	92.8%	★★★★★
2025	87.6	13 of 104	87.5%	★★★★☆
2024	89.7	10 of 102	90.2%	★★★★★
2023	90.6	8 of 103	92.2%	★★★★★
2022	77.0	30 of 106	71.7%	★★★★☆
2021	83.1	31 of 189	83.6%	★★★★☆

Male

Year	Avg score	Statewide rank	Connecticut percentile	Rating
2026	81.4	25 of 115	78.3%	★★★★☆
2025	85.1	19 of 111	82.9%	★★★★☆
2024	70.2	36 of 100	64.0%	★★★☆☆
2021	84.5	29 of 182	84.1%	★★★★☆

Special Education

Year	Avg score	Statewide rank	Connecticut percentile	Rating
2021	78.7	33 of 175	81.1%	★★★★☆

White

Year	Avg score	Statewide rank	Connecticut percentile	Rating
2026	74.2	29 of 107	72.9%	★★★★☆
2025	75.8	27 of 116	76.7%	★★★★☆
2024	71.1	30 of 116	74.1%	★★★★☆
2023	85.3	13 of 116	88.8%	★★★★☆
2022	46.3	68 of 117	41.9%	★★☆☆☆
2021	77.8	30 of 155	80.6%	★★★★☆
2019	70.1	39 of 113	65.5%	★★★☆☆
2018	67.7	40 of 105	61.9%	★★★☆☆

How student groups rank statewide ? (each group's percentile vs the same group at other schools — higher is better; the +/- beside each compares the group with this school's overall percentile)

Female (2026)93rd percentile+3 vs school

Special Education (2021)81st percentile-3 vs school

Male (2026)78th percentile-11 vs school

White (2026)73rd percentile-17 vs school

By subject vs Connecticut (2025-2026) ?

English Language Arts85%+30 vs state

Science75%+24 vs state

★

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Schools Near Haddam-Killingworth High School

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Ranking:

E Elementary M Middle H High A Alternative P Private

School	Students/Teachers	Ranking (2026)	Ranking (2025)	NGSS Science (2026)	SAT English Language Arts (2026)	SAT Math (2026)	Per Pupil Expenditures (2025)
Haddam-Killingworth High School	Public	9-12	95 Little City Road	Higganum	06441	Lower Connecticut River Valley Planning Region	Regional School District 17	No	No	No	No	(860) 345-8541	466	49	9.5	13.7%	409 (87.8%)	6 (1.3%)	23 (4.9%)	10 (2.1%)	1 (0.2%)	0 (0.0%)	16 (3.4%)	88.9	14^th of 135 public high schools	89.6%	88.4	16^th of 141 public high schools	88.7%	2	74.8	85.3		$30,768
Coginchaug Regional High School	Public	9-12	135 Pickett Ln.	Durham	06422	Lower Connecticut River Valley Planning Region	Regional School District 13	No	No	No	Yes	(860) 349-7215	356	40	8.8	15.7%	298 (83.7%)	4 (1.1%)	37 (10.4%)	7 (2.0%)	0 (0.0%)	0 (0.0%)	10 (2.8%)	84.8	23^rd of 135 public high schools	83.0%				(n/a)	74.2	77.5		$33,510
Nathan Hale-Ray High School	Public	9-12	15 School Drive	Moodus	06469	Lower Connecticut River Valley Planning Region	East Haddam School District	No	No	No	Yes	(860) 873-5065	262	33	7.9	29.4%	228 (87.0%)	0 (0.0%)	24 (9.2%)	4 (1.5%)	1 (0.4%)	0 (0.0%)	4 (1.5%)	68	44^th of 135 public high schools	67.4%	60.2	56^th of 141 public high schools	60.3%	12	1106.0	62.3	41.0	$29,429
Whiting Forensic Hospital	Public	9-12	70 O'Brien Drive	Middletown	06547	Lower Connecticut River Valley Planning Region	Department of Mental Health and Addiction Services	No	(n/a)	No	(n/a)	(860) 262-7175	0	1	.0	—	0 ()	0 ()	0 ()	0 ()	0 ()	0 ()	0 ()							(n/a)
Vinal Technical High School	Public	9-12	60 Daniels St.	Middletown	06457	Lower Connecticut River Valley Planning Region	Connecticut Technical Education and Career System	No	No	No	No	(860) 344-7100	522	49	10.6	35.8%	333 (63.8%)	34 (6.5%)	104 (19.9%)	4 (0.8%)	0 (0.0%)	0 (0.0%)	43 (8.2%)	17.8	106^th of 135 public high schools	21.5%	12.9	123^rd of 141 public high schools	12.8%	17	29.2		8.4	$33,758
East Hampton High School	Public	9-12	15 North Maple St.	East Hampton	06424	Lower Connecticut River Valley Planning Region	East Hampton School District	No	No	No	No	(860) 365-4030	488	43	11.2	21.7%	425 (87.1%)	8 (1.6%)	33 (6.8%)	4 (0.8%)	0 (0.0%)	0 (0.0%)	18 (3.7%)							(n/a)	78.4			$23,232
Portland High School	Public	9-12	95 High Street	Portland	06480	Lower Connecticut River Valley Planning Region	Portland School District	No	No	No	No	(860) 342-1720	323	31	10.5	31.6%	234 (72.4%)	22 (6.8%)	48 (14.9%)	6 (1.9%)	0 (0.0%)	0 (0.0%)	12 (3.7%)	58.2	58^th of 135 public high schools	57.0%	62.9	53^rd of 141 public high schools	62.4%	5	56.3	57.7	32.4	$24,910
Valley Regional High School	Public	9-12	256 Kelsey Hill Rd.	Deep River	06417	Lower Connecticut River Valley Planning Region	Regional School District 04	No	No	No	Yes	(860) 526-5328	429	46	9.3	27.3%	351 (81.8%)	5 (1.2%)	47 (11.0%)	6 (1.4%)	0 (0.0%)	0 (0.0%)	15 (3.5%)	67.2	45^th of 135 public high schools	66.7%	70.7	45^th of 141 public high schools	68.1%		63.5	68.0	31.1	$31,338
Middletown High School	Public	9-12	200 LaRosa Lane	Middletown	06457	Lower Connecticut River Valley Planning Region	Middletown School District	No	No	No	No	(860) 704-4500	1,193	101	11.7	51.2%	453 (38.0%)	276 (23.1%)	279 (23.4%)	64 (5.4%)	3 (0.3%)	6 (0.5%)	110 (9.2%)	25.3	91^st of 135 public high schools	32.6%	23.1	101^st of 141 public high schools	28.4%	10	31.8	39.5	18.8	$26,430
The Morgan School	Public	9-12	71 Killingworth Tpke.	Clinton	06413	Lower Connecticut River Valley Planning Region	Clinton School District	No	No	No	No	(860) 664-6504	473	49	9.6	40.0%	322 (68.1%)	5 (1.1%)	118 (24.9%)	18 (3.8%)	0 (0.0%)	0 (0.0%)	9 (1.9%)	59.5	54^th of 135 public high schools	60.0%	64.5	50^th of 141 public high schools	64.5%	4	56.3	60.6		$26,789

Frequently Asked Questions about Haddam-Killingworth High School

What district is Haddam-Killingworth High School in?

Regional School District 17

What is the racial makeup of Haddam-Killingworth High School?

Students at Haddam-Killingworth High School are 88% White, 5% Hispanic, 3% Two or more races, 2% Asian, 1% African American.

Is Haddam-Killingworth High School a good school?

Haddam-Killingworth High School ranks 14^th of 135 Connecticut high schools. SchoolDigger rates this school 5 stars out of 5.

What schools feed into Haddam-Killingworth High School?

Haddam-Killingworth High School is fed by the following schools:

Elementary : Burr District Elementary School
Elementary : Haddam-Killingworth Intermediate School
Elementary : Killingworth Elementary School
Middle : Haddam-Killingworth Middle School

How many students attend Haddam-Killingworth High School?

In the 2024-25 school year, 466 students attended Haddam-Killingworth High School.

Rate Haddam-Killingworth High School!

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Latest Connecticut data All new data »

2024–25 through 2025–26 attendance data & graduation ratesAug 31, 2026

2025–26 NGSS, SAT & SBAC test scoresAug 31, 2026

2024–25 school spending dataApr 2, 2026

2024–25 attendance dataNov 6, 2025

SchoolDigger data sources: National Center for Education Statistics, U.S. Department of Education, the U.S. Census Bureau and the Connecticut Department of Education.

IMPORTANT DISCLAIMERS: Not all boundaries are included. We make every effort to ensure that boundaries are up-to-date. But it's important to note that these are approximations and are for general informational purposes only. To verify legal descriptions of boundaries or school locations, contact your local tax assessor's office and/or school district.

School													Students/Teachers											Ranking (2026)				Ranking (2025)				NGSS Science (2026)	SAT English Language Arts (2026)	SAT Math (2026)	Per Pupil Expenditures (2025)
Name	Type	Grades	Address	City	Zip	County	District	Is Charter	Is Magnet	Is Virtual	Is Title I	Phone	Enrollment	Full-time Teachers	Student/ Teacher Ratio	Free/reduced lunch (2024-25)	White	Black	Hispanic	Asian	American Indian	Pacific Islander	Two or More Races	Average Standard Score (2026)	Statewide Rank (2026)	State Percentile (2026)	SchoolDigger Rating (2026)	Average Standard Score (2025)	Statewide Rank (2025)	State Percentile (2025)	Rank Change from Previous Year	NGSS Science 11th Grade	SAT English Language Arts 11th Grade	SAT Math 11th Grade	Total
Haddam-Killingworth High School	Public	9-12	95 Little City Road	Higganum	06441	Lower Connecticut River Valley Planning Region	Regional School District 17	No	No	No	No	(860) 345-8541	466	49	9.5	13.7%	409 (87.8%)	6 (1.3%)	23 (4.9%)	10 (2.1%)	1 (0.2%)	0 (0.0%)	16 (3.4%)	88.9	14^th of 135 public high schools	89.6%		88.4	16^th of 141 public high schools	88.7%	2	74.8	85.3		$30,768
Coginchaug Regional High School	Public	9-12	135 Pickett Ln.	Durham	06422	Lower Connecticut River Valley Planning Region	Regional School District 13	No	No	No	Yes	(860) 349-7215	356	40	8.8	15.7%	298 (83.7%)	4 (1.1%)	37 (10.4%)	7 (2.0%)	0 (0.0%)	0 (0.0%)	10 (2.8%)	84.8	23^rd of 135 public high schools	83.0%					(n/a)	74.2	77.5		$33,510
Nathan Hale-Ray High School	Public	9-12	15 School Drive	Moodus	06469	Lower Connecticut River Valley Planning Region	East Haddam School District	No	No	No	Yes	(860) 873-5065	262	33	7.9	29.4%	228 (87.0%)	0 (0.0%)	24 (9.2%)	4 (1.5%)	1 (0.4%)	0 (0.0%)	4 (1.5%)	68	44^th of 135 public high schools	67.4%		60.2	56^th of 141 public high schools	60.3%	12	1106.0	62.3	41.0	$29,429
Whiting Forensic Hospital	Public	9-12	70 O'Brien Drive	Middletown	06547	Lower Connecticut River Valley Planning Region	Department of Mental Health and Addiction Services	No	(n/a)	No	(n/a)	(860) 262-7175	0	1	.0	—	0 ()	0 ()	0 ()	0 ()	0 ()	0 ()	0 ()								(n/a)
Vinal Technical High School	Public	9-12	60 Daniels St.	Middletown	06457	Lower Connecticut River Valley Planning Region	Connecticut Technical Education and Career System	No	No	No	No	(860) 344-7100	522	49	10.6	35.8%	333 (63.8%)	34 (6.5%)	104 (19.9%)	4 (0.8%)	0 (0.0%)	0 (0.0%)	43 (8.2%)	17.8	106^th of 135 public high schools	21.5%		12.9	123^rd of 141 public high schools	12.8%	17	29.2		8.4	$33,758
East Hampton High School	Public	9-12	15 North Maple St.	East Hampton	06424	Lower Connecticut River Valley Planning Region	East Hampton School District	No	No	No	No	(860) 365-4030	488	43	11.2	21.7%	425 (87.1%)	8 (1.6%)	33 (6.8%)	4 (0.8%)	0 (0.0%)	0 (0.0%)	18 (3.7%)								(n/a)	78.4			$23,232
Portland High School	Public	9-12	95 High Street	Portland	06480	Lower Connecticut River Valley Planning Region	Portland School District	No	No	No	No	(860) 342-1720	323	31	10.5	31.6%	234 (72.4%)	22 (6.8%)	48 (14.9%)	6 (1.9%)	0 (0.0%)	0 (0.0%)	12 (3.7%)	58.2	58^th of 135 public high schools	57.0%		62.9	53^rd of 141 public high schools	62.4%	5	56.3	57.7	32.4	$24,910
Valley Regional High School	Public	9-12	256 Kelsey Hill Rd.	Deep River	06417	Lower Connecticut River Valley Planning Region	Regional School District 04	No	No	No	Yes	(860) 526-5328	429	46	9.3	27.3%	351 (81.8%)	5 (1.2%)	47 (11.0%)	6 (1.4%)	0 (0.0%)	0 (0.0%)	15 (3.5%)	67.2	45^th of 135 public high schools	66.7%		70.7	45^th of 141 public high schools	68.1%		63.5	68.0	31.1	$31,338
Middletown High School	Public	9-12	200 LaRosa Lane	Middletown	06457	Lower Connecticut River Valley Planning Region	Middletown School District	No	No	No	No	(860) 704-4500	1,193	101	11.7	51.2%	453 (38.0%)	276 (23.1%)	279 (23.4%)	64 (5.4%)	3 (0.3%)	6 (0.5%)	110 (9.2%)	25.3	91^st of 135 public high schools	32.6%		23.1	101^st of 141 public high schools	28.4%	10	31.8	39.5	18.8	$26,430
The Morgan School	Public	9-12	71 Killingworth Tpke.	Clinton	06413	Lower Connecticut River Valley Planning Region	Clinton School District	No	No	No	No	(860) 664-6504	473	49	9.6	40.0%	322 (68.1%)	5 (1.1%)	118 (24.9%)	18 (3.8%)	0 (0.0%)	0 (0.0%)	9 (1.9%)	59.5	54^th of 135 public high schools	60.0%		64.5	50^th of 141 public high schools	64.5%	4	56.3	60.6		$26,789