Beta You're viewing our redesigned school list. Prefer the classic layout?

Best Elementary Schools in Zip Code 06340

At a glance

Schools

1,215

Students

Top rankedCatherine Kolnaski Magnet School242^nd of 492 Connecticut elementary schools

See the top-ranked Connecticut schools →

Summary:

In zip code 06340 (Groton, CT), there are three elementary schools serving grades PK–5 or K–5 within the Groton School District, which ranks 105th out of 153 districts in Connecticut.

Among the three schools, Catherine Kolnaski Magnet School stands out as the strongest and most consistent performer, ranking 242nd out of 491 schools (51st percentile) in 2025–2026 with a 3-star rating all three years. It leads the group in overall SBAC proficiency (≈52.2%), including the strongest math results (≈51.2%) and notably high science scores (66–67% proficient). This is particularly noteworthy because Catherine Kolnaski also serves the highest percentage of students eligible for free/reduced-price lunch (80.27%), yet it outperforms its peers. Thames River Magnet School is nearly as strong overall (≈51.7% average SBAC proficiency) and posts the highest ELA average (≈54.3%), with standout 5th-grade scores of 61.2% in ELA and 53.7% in math. However, Thames River has a higher chronic absenteeism rate (15.1%) than its peers. Charles Barnum Magnet School trails the other two academically, with the lowest state rank (315th, 36th percentile) and lowest SBAC proficiency (≈42.8%), despite having the best attendance (9.4%) and the lowest poverty rate (51.33%).

All three schools share a notable strength in science, beating the state average of roughly 52–53% with proficiency rates between 59% and 67%. Spending is similar across the board ($15,605–$16,180 per student) with student-teacher ratios around 12:1. While Catherine Kolnaski and Thames River have remained stable in the 50th percentile range, Charles Barnum has trended downward from the 49th percentile in 2023–2024 to the 36th percentile in 2025–2026. That said, Charles Barnum showed significant 3rd-grade improvement (ELA from 29.3% to 45.2%, math from 37.9% to 50.0%), suggesting a possible turnaround. For parents, Catherine Kolnaski offers the most consistent overall performance, Thames River is a strong choice for ELA, and Charles Barnum may warrant closer observation despite its attendance strengths.

Load more schools when map is moved

Ranking:

E Elementary M Middle H High A Alternative P Private

Choose columns to see: Summary School Students/Teachers Ranking Test Scores Finance All

School													Students/Teachers											Ranking (2026)				Ranking (2025)				NGSS Science (2026)	SBAC English Language Arts (2026)			SBAC Mathematics (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 5th Grade	SBAC English Language Arts 3rd Grade	SBAC English Language Arts 4th Grade	SBAC English Language Arts 5th Grade	SBAC Mathematics 3rd Grade	SBAC Mathematics 4th Grade	SBAC Mathematics 5th Grade	Total
Charles Barnum Magnet School	Public	K-5	68 Briar Hill Rd.	Groton	06340	Southeastern Connecticut Planning Region	Groton School District	No	No	No	No	(860) 449-5640	339	29	11.7	51.3%	174 (51.3%)	24 (7.1%)	93 (27.4%)	8 (2.4%)	0 (0.0%)	1 (0.3%)	39 (11.5%)	34.6	315^th of 492 public elementary schools	36.0%		37.5	295^th of 493 public elementary schools	40.2%	20	506.0	45.2	32.8	46.8	50.0	2464.0	44.7	$22,716
Thames River Magnet School	Public, Magnet	PK, KG-5	250 Brandegee Avenue	Groton	06340	Southeastern Connecticut Planning Region	Groton School District	No	Yes	No	No	(860) 980-8230	501	41	12.2	74.3%	200 (39.9%)	48 (9.6%)	127 (25.3%)	39 (7.8%)	5 (1.0%)	1 (0.2%)	81 (16.2%)	53	247^th of 492 public elementary schools	49.8%		51.5	247^th of 493 public elementary schools	49.9%		507.0	54.1	49.2	61.2	53.2	48.3	53.7	$22,566
Catherine Kolnaski Magnet School	Public, Magnet	K-5	500 Poquonnock Rd.	Groton	06340	Southeastern Connecticut Planning Region	Groton School District	No	Yes	No	Yes	(860) 449-5608	375	31	11.9	80.3%	144 (38.4%)	18 (4.8%)	114 (30.4%)	30 (8.0%)	2 (0.5%)	0 (0.0%)	67 (17.9%)	54.6	242^nd of 492 public elementary schools	50.8%		53.5	242^nd of 493 public elementary schools	50.9%		66.1	50.9	56.1	50.0	58.2	54.4	46.4	$21,873

Cities Near Zip Code 06340

City	Distance	# of Schools	Statewide Rank
Groton	0.96 mi	7	128^th
Mystic	2.42 mi	2	100^th
New London	2.83 mi	10	174^th
Waterford	4.25 mi	5	76^th
Quaker Hill	4.96 mi	1	99^th

See the top CT Connecticut cities

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.