Primary and Secondary Education companies headquartered in Connecticut (2026 list)

#	Company	Industry	Headquarters	Employees	Founded
1	Stamford Public Schools stamfordpublicschools.org A learning organization dedicated to providing an education that cultivates productive habits of mind, body, and heart in every student	Primary and Secondary Education	🇺🇸 Stamford	1,169	1850
2	Fairfield Public Schools fairfieldschools.org The company's mission is to provide a comprehensive educational program for students to become lifelong learners and responsible citizens	Primary and Secondary Education	🇺🇸 Fairfield	1,019	n/a
3	Westminster School westminster-school.org A top college-preparatory boarding school providing a challenging academic program focused on liberal arts education for students in grades 9-12 and postgraduate	Primary and Secondary Education	🇺🇸 Simsbury	563	1888
4	Greenwich Public Schools greenwichschools.org Operates public schools from kindergarten through high school, including neighborhood, magnet, and alternative programs, plus a tuition-based preschool for residents and employees.	Primary and Secondary Education	🇺🇸 Greenwich	525	n/a
5	Groton Public Schools grotonschools.org The company focuses on education and knowledge sharing, with a mission centered around teaching and learning	Primary and Secondary Education	🇺🇸 Groton	495	n/a
6	Windsor Public Schools windsorct.org A school district in Windsor, CT, serving nearly 4,000 students with diverse educational opportunities, technology integration, and strong community partnerships for educators	Primary and Secondary Education	🇺🇸 Windsor	458	n/a
7	Oxford Academy oxfordacademy.net A top independent boarding school on the CT Shoreline offering one-to-one education for all boys, focusing on academic success and individualized instruction	Primary and Secondary Education	🇺🇸 Westbrook	436	1906
8	Danbury Public Schools CT danbury.k12.ct.us A diverse and inclusive city in northern Fairfield County offering transformational learning experiences through its public schools and community partnerships	Primary and Secondary Education	🇺🇸 Danbury	424	n/a
9	Kent School kent-school.edu Independent co-ed boarding school in Northwestern Connecticut offering college prep education, arts, athletics, clubs, and leadership opportunities for grades 9-12	Primary and Secondary Education	🇺🇸 Kent	360	1906
10	Greenwich Country Day School gcds.net Co-ed independent school in Greenwich, CT prepares Nursery through Grade 12 students for college and beyond as ethical, confident leaders	Primary and Secondary Education	🇺🇸 Greenwich	357	1926
11	Brunswick School brunswickschool.org A college-preparatory day school for boys offering education from Pre-K to grade 12, focusing on academic rigor, character development, and self-discipline	Primary and Secondary Education	🇺🇸 Greenwich	349	1902
12	The Hotchkiss School hotchkiss.org An independent boarding school in Connecticut providing quality education to students in grades 9-12, focusing on personal growth and development Offering career opportunities	Primary and Secondary Education	🇺🇸 Lakeville	345	1891
13	Madison Public Schools madison.k12.ct.us Provides quality education to students at Island Avenue Elementary within the Madison Public Schools district	Primary and Secondary Education	🇺🇸 Madison	334	n/a
14	The Loomis Chaffee School loomischaffee.org A prestigious New England boarding school offering a challenging academic program, close faculty-student bonds, and a diverse community preparing students for higher education	Primary and Secondary Education	🇺🇸 Windsor	332	n/a
15	Canterbury School cbury.org A college preparatory boarding and day school emphasizing values like honesty, respect, and compassion to develop well-rounded students for college and life	Primary and Secondary Education	🇺🇸 New Milford	326	1915
16	St. Luke's School stlukesct.org A secular, private day school for grades 5-12 in CT, focused on outstanding academics, strong community connections, moral development, and leadership skills	Primary and Secondary Education	🇺🇸 New Canaan	322	1928
17	Hopkins School hopkins.edu A traditional coeducational day school for grades 7-12 with a distinguished history spanning over 360 years, located in New Haven	Primary and Secondary Education	🇺🇸 New Haven	322	1660
18	Southington Board Of Education southingtonschools.org This primary/secondary educational institution is located in Southington, Connecticut, dedicated to providing education to students in the area	Primary and Secondary Education	🇺🇸 Southington	313	n/a
19	Miss Porter's School porters.org A prestigious college preparatory boarding and day school for girls in grades 9-12, empowering young women to become global citizens Visit wwwportersorg for more information	Primary and Secondary Education	🇺🇸 Farmington	255	1843
20	Salisbury School salisburyschool.org A private, all-boys college-preparatory boarding school in Connecticut focusing on building character, leadership, and academic preparedness for college and beyond	Primary and Secondary Education	🇺🇸 Salisbury	219	1901
21	Greenwich High School ghs.greenwichschools.org A collaborative community of learners focused on academic excellence, integrity, and responsibility at a Primary/Secondary school in Greenwich, Connecticut	Primary and Secondary Education	🇺🇸 Greenwich	180	n/a
22	S&S Worldwide ssww.com The company develops and distributes tools that promote activity, creativity, communication, and growth to support educators, professionals, and individuals	Primary and Secondary Education	🇺🇸 Colchester	179	1906
23	Ellington Public Schools ellingtonpublicschools.org The company focuses on developing exceptional learners and leaders who are courageous, reflective, and contributing citizens in the world	Primary and Secondary Education	🇺🇸 Ellington	169	n/a
24	Suffield Academy suffieldacademy.org An independent secondary school with a diverse community offering academic excellence, individualized teaching, and a structured environment preparing students for leadership and citizenship	Primary and Secondary Education	🇺🇸 Suffield	169	1833
25	Cooperative Educational Services ces.k12.ct.us CES provides educational support and services in Fairfield County, CT through school programs, training, and community initiatives for educators, students, and families	Primary and Secondary Education	🇺🇸 Trumbull	165	1976
26	Regional School District #4 reg4.k12.ct.us Regional School District 4, located in Deep River, Connecticut, is an educational institution serving the local community with academic programs and resources	Primary and Secondary Education	🇺🇸 Deep River	165	n/a
27	Educational Playcare educationalplaycare.com A leader in high-quality childcare, providing educational programs for children from 6 weeks to 12 years old in Connecticut	Primary and Secondary Education	🇺🇸 Windsor	161	1986
28	New Milford High School nmhs.newmilfordps.org A public high school in New Milford, Connecticut, preparing students to excel in a changing world, embrace challenges, and contribute to society	Primary and Secondary Education	🇺🇸 New Milford	157	n/a
29	Bristol Board of Education bristol.k12.ct.us The company focuses on teaching and learning with passion and purpose, striving to make a positive impact on education	Primary and Secondary Education	🇺🇸 Bristol	156	n/a
30	Farmington Public Schools fpsct.org A K-12 public school system in Farmington, CT, known for academic excellence and innovation, located just outside of Hartford	Primary and Secondary Education	🇺🇸 Farmington	155	n/a
31	Fairfield College Preparatory School fairfieldprep.org An all-boys high school located in Fairfield, Connecticut, providing college preparatory education to students	Primary and Secondary Education	🇺🇸 Fairfield	152	1942
32	Suffield Public Schools suffield.org Public school district providing education services in Suffield, Connecticut	Primary and Secondary Education	🇺🇸 Suffield	152	n/a
33	Staples High School shs.westportps.org A top-rated public high school in Westport, CT with 1800 students founded in 1884 named after Horace Staples	Primary and Secondary Education	🇺🇸 Westport	150	1884
34	Hamden Hall Country Day School hamdenhall.org They are an inclusive PreSchool through Grade 12 community promoting academic excellence, individual growth, and socially considerate atmosphere	Primary and Secondary Education	🇺🇸 Hamden	150	1912

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Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Oct 24, 2026.

Primary and Secondary Education companies headquartered in Connecticut

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