Largest Counties in Connecticut

One of the original 13 colonies, Connecticut was settled by the English in the early 1600s. It played a significant role in early American industry. Connecticut has 9 counties, though they no longer have governmental functions.

Counties in Connecticut

1. Fairfield County

County Facts

  • Population: 957,419 (2020 Census)
  • Area Codes: 203, 475
  • ZIP Codes: 06601-06928
  • County Seat: Bridgeport

Geography and History

Fairfield County, located in southwestern Connecticut, spans 837 square miles and is the most populous county in the state. It is bordered by the Long Island Sound to the south and New York State to the west. Historically, Fairfield County was settled in the 1630s by Puritans from Massachusetts. The county became a central part of early American trade and industry, with towns like Bridgeport and Stamford growing as industrial hubs in the 19th century. By the 20th century, the county saw a shift toward finance, insurance, and professional services, becoming a commuter region for New York City. Its mix of coastal areas, affluent suburbs, and urban centers gives Fairfield a unique balance of residential and commercial life.

Colleges and Universities

  • University of Connecticut (Stamford Campus): A satellite campus offering undergraduate and graduate programs with a focus on business and liberal arts.
  • Fairfield University: A private Jesuit university known for its programs in business, nursing, and the humanities.
  • Sacred Heart University: A private Catholic university in Fairfield offering a wide range of undergraduate and graduate degrees.
  • Western Connecticut State University: A public university in Danbury known for its arts, business, and education programs.

Major Landmarks

Fairfield County is home to landmarks like The Maritime Aquarium in Norwalk, which highlights marine life from Long Island Sound, and Beardsley Zoo in Bridgeport, the only zoo in Connecticut. Weir Farm National Historic Site in Wilton preserves the legacy of American Impressionist painter Julian Alden Weir. The Bruce Museum in Greenwich features art and science exhibits, while Sherwood Island State Park in Westport offers beaches and nature trails. The Aldrich Contemporary Art Museum in Ridgefield is renowned for its modern art exhibits, and Stamford Museum & Nature Center blends art, science, and agriculture.


2. Hartford County

County Facts

  • Population: 899,498 (2020 Census)
  • Area Codes: 860, 959
  • ZIP Codes: 06001-06199
  • County Seat: Hartford

Geography and History

Hartford County is located in central Connecticut and spans 751 square miles. The Connecticut River runs through the county, contributing to its early settlement in the 1630s by Dutch traders and English Puritans. Hartford, the county seat, became an important center for trade, insurance, and government, known as the “Insurance Capital of the World.” The county played a significant role during the American Revolution, with notable figures like Nathan Hale and George Washington visiting the area. By the 19th century, Hartford County’s industrial base grew with the production of firearms, typewriters, and bicycles. Today, Hartford County remains a center for government, education, and finance.

Colleges and Universities

  • University of Hartford: A private university offering a wide range of programs in arts, business, engineering, and health sciences.
  • Trinity College: A private liberal arts college in Hartford known for its rigorous academic programs and historic campus.
  • Central Connecticut State University (CCSU): A public university in New Britain, offering diverse undergraduate and graduate programs.
  • Goodwin University: A private institution in East Hartford focusing on career-oriented programs in health care, business, and technology.

Major Landmarks

Hartford County boasts significant landmarks such as the Mark Twain House and Museum, where the famous author lived and wrote many of his works. The Wadsworth Atheneum is the oldest public art museum in the U.S. Bushnell Park in downtown Hartford is the nation’s oldest publicly funded park, and The Connecticut Science Center offers interactive exhibits on science and technology. Elizabeth Park, known for its rose gardens, is a popular spot for nature lovers. New Britain Museum of American Art is the first museum in the country dedicated to American art. Dinosaur State Park in Rocky Hill preserves early Jurassic-era dinosaur tracks.


3. New Haven County

County Facts

  • Population: 864,835 (2020 Census)
  • Area Codes: 203, 475
  • ZIP Codes: 06401-06799
  • County Seat: New Haven

Geography and History

New Haven County is located along the southern coast of Connecticut, covering 862 square miles. The county is anchored by the city of New Haven, one of the oldest cities in the U.S., founded in 1638 by Puritan settlers. It developed into a hub for education and industry, especially with the establishment of Yale University in 1701. During the 19th century, New Haven County’s economy was driven by manufacturing, including firearms production at the Winchester Repeating Arms Company. The county’s coastal location along Long Island Sound also made it important for trade and shipping. Today, New Haven is known for its rich cultural heritage and academic institutions.

Colleges and Universities

  • Yale University: One of the most prestigious universities in the world, known for its law, business, and medical schools as well as its contributions to research and the humanities.
  • Southern Connecticut State University: A public university in New Haven with strong programs in education, business, and health sciences.
  • Quinnipiac University: A private university in Hamden known for its law school and health sciences programs.
  • Albertus Magnus College: A private Catholic liberal arts college in New Haven offering undergraduate and graduate programs in business, education, and the arts.

Major Landmarks

New Haven County is rich in historical and cultural landmarks, including Yale University, with its stunning Gothic architecture and world-class museums such as the Yale University Art Gallery and the Yale Peabody Museum of Natural History. East Rock Park offers scenic views of New Haven and Long Island Sound. The Knights of Columbus Museum highlights the history of this Catholic organization, while Wooster Square is known for its Italian heritage and famous pizzerias. Lighthouse Point Park in New Haven provides beach access and a historic lighthouse, while Sleeping Giant State Park in Hamden offers hiking trails and panoramic views.


4. New London County

County Facts

  • Population: 268,555 (2020 Census)
  • Area Codes: 860
  • ZIP Codes: 06320-06415
  • County Seat: New London

Geography and History

New London County is located in southeastern Connecticut, bordered by the Long Island Sound and covering 666 square miles. The county’s history dates back to the 1600s when it became a center for shipbuilding and trade, thanks to its strategic coastal location. New London was a key port during the American Revolution and later became one of the busiest whaling ports in the world. The county’s maritime history continued into the 20th century with the establishment of the U.S. Coast Guard Academy in New London and the nearby Naval Submarine Base in Groton. Today, New London County’s economy is supported by tourism, military, and education.

Colleges and Universities

  • Connecticut College: A private liberal arts college in New London known for its environmental studies, art, and international relations programs.
  • U.S. Coast Guard Academy: A federal service academy in New London, training officers for the Coast Guard.
  • Mitchell College: A small, private liberal arts college offering associate and bachelor’s degrees with a focus on individualized learning.
  • Three Rivers Community College: Located in Norwich, offering associate degrees and vocational training.

Major Landmarks

New London County is home to significant landmarks such as Mystic Seaport, the largest maritime museum in the U.S., and Mystic Aquarium, known for its marine life exhibits. Fort Trumbull State Park in New London preserves a historic fort used in various conflicts. The Submarine Force Museum in Groton features the USS Nautilus, the world’s first nuclear-powered submarine. Ocean Beach Park in New London offers beautiful sandy beaches, while Harkness Memorial State Park in Waterford features gardens and a historic mansion. Gillette Castle State Park in East Haddam showcases a unique medieval-style mansion.


5. Litchfield County

County Facts

  • Population: 185,186 (2020 Census)
  • Area Codes: 860
  • ZIP Codes: 06018-06794
  • County Seat: Litchfield (historical, no longer active county government)

Geography and History

Litchfield County is located in the northwestern corner of Connecticut, covering 945 square miles, making it the state’s largest county by area. The region is known for its rolling hills, forests, and scenic countryside. Established in 1751, Litchfield County was originally an agricultural center, but by the 19th century, it became known for its iron industry. The towns of Litchfield and Torrington were early industrial hubs, producing everything from ironworks to textiles. The county also played an important role in education, with the Litchfield Law School being one of the first law schools in the U.S. Today, Litchfield County is known for its quaint towns, historical sites, and outdoor recreation.

Colleges and Universities

  • Northwestern Connecticut Community College: Located in Winsted, offering associate degrees and vocational training.
  • Western Connecticut State University (Satellite Campus): A smaller branch of the main university in Danbury, offering a variety of courses and programs.
  • Litchfield Hills Preparatory School: A private institution focusing on college preparatory programs for students with diverse learning needs.

Major Landmarks

Litchfield County is known for its scenic beauty and historic sites such as Topsmead State Forest, which offers hiking trails and a historic English-style manor. White Memorial Conservation Center in Litchfield provides nature trails and educational exhibits on local wildlife. Kent Falls State Park is a popular destination for its waterfall and hiking. Lime Rock Park in Salisbury is a famous race track for auto enthusiasts. The town of Litchfield is known for its well-preserved colonial architecture and historical significance as an early American legal center. Mount Tom State Park offers picturesque views of the surrounding countryside.


6. Middlesex County

County Facts

  • Population: 164,245 (2020 Census)
  • Area Codes: 860
  • ZIP Codes: 06409-06498
  • County Seat: Middletown

Geography and History

Middlesex County is located in the central part of Connecticut, covering 439 square miles, with the Connecticut River running through it. The county was established in 1785 and has a rich maritime and industrial history. The city of Middletown, the county seat, was once one of the most important shipping and shipbuilding centers in New England, thanks to its position along the Connecticut River. During the 19th century, the county’s economy diversified into manufacturing, with textiles, firearms, and silverware becoming major industries. Today, Middlesex County is known for its blend of suburban living, historical sites, and natural beauty.

Colleges and Universities

  • Wesleyan University: A prestigious private liberal arts university in Middletown known for its rigorous academic programs and research opportunities.
  • Middlesex Community College: Offers associate degrees and vocational programs with a focus on transfer opportunities to four-year institutions.
  • Whelen Engineering School: A private institution offering specialized programs in engineering and technical fields.

Major Landmarks

Middlesex County is home to Gillette Castle State Park, a unique medieval-style mansion built by actor William Gillette. Wesleyan University’s Center for the Arts offers performances and exhibits in music, theater, and art. The Connecticut River Museum in Essex showcases the river’s history and role in shaping the region. Haddam Meadows State Park provides scenic views of the Connecticut River, while Cockaponset State Forest offers hiking and fishing opportunities. The Goodspeed Opera House in East Haddam is a renowned theater producing musicals and plays, and Harbor Park in Middletown offers riverfront dining and recreation.


7. Windham County

County Facts

  • Population: 117,335 (2020 Census)
  • Area Codes: 860
  • ZIP Codes: 06226-06350
  • County Seat: Willimantic (historical, no longer active county government)

Geography and History

Windham County, located in the northeastern part of Connecticut, covers 521 square miles and is often referred to as the “Quiet Corner” due to its rural character. The county was established in 1726 and became an important center for textiles during the Industrial Revolution. Willimantic, one of the largest towns in the county, was known for its cotton mills and silk production. Windham County’s economy was largely based on agriculture and manufacturing in the 19th century, but by the 20th century, much of the region became more residential, serving as a quiet retreat from the busier parts of the state.

Colleges and Universities

  • Eastern Connecticut State University (ECSU): A public liberal arts university in Willimantic known for its programs in education, business, and the arts.
  • Quinebaug Valley Community College: Offers associate degrees and technical training, serving students from across northeastern Connecticut.
  • Windham Technical High School: A vocational-technical high school preparing students for careers in various skilled trades.

Major Landmarks

Windham County is known for Roseland Cottage in Woodstock, a historic Gothic Revival house, and Nathan Hale Homestead in Coventry, which was home to the Revolutionary War hero. The Prudence Crandall Museum in Canterbury honors the abolitionist who opened one of the first schools for African American girls in the U.S. Mashamoquet Brook State Park in Pomfret offers hiking trails and camping. Air Line State Park Trail is a popular trail for biking and hiking, offering scenic views of the rural countryside. The Windham Textile & History Museum in Willimantic preserves the history of the county’s textile industry.


8. Tolland County

County Facts

  • Population: 149,788 (2020 Census)
  • Area Codes: 860
  • ZIP Codes: 06029-06282
  • County Seat: Rockville (historical, no longer active county government)

Geography and History

Tolland County, located in the northeastern part of Connecticut, covers 410 square miles and is known for its rural charm and small towns. The county was established in 1785, and its early economy was based on agriculture. By the 19th century, Tolland County became known for its mills and factories, particularly in towns like Rockville, which developed as a center for textile manufacturing. Although the county remains largely residential today, its proximity to the University of Connecticut has influenced its development, with many residents commuting to work in nearby cities like Hartford.

Colleges and Universities

  • University of Connecticut (UConn): The state’s flagship public university located in Storrs, known for its programs in law, agriculture, business, and sports management.
  • Tolland County Agricultural High School: A specialized school focusing on agricultural education and vocational training.
  • Eastern Connecticut State University (Satellite Programs): Provides educational opportunities for students in the county through various outreach programs and partnerships with local schools.

Major Landmarks

Tolland County is home to the University of Connecticut, whose campus features the Jorgensen Center for the Performing Arts and the William Benton Museum of Art. Bolton Notch State Park offers hiking trails and scenic views, while Nathan Hale State Forest honors the Revolutionary War patriot who was born in the area. Rockville Historic District showcases Victorian-era architecture and mill buildings. Bigelow Hollow State Park in Union provides outdoor recreation with its extensive hiking trails and lakes. The Ballard Institute and Museum of Puppetry at UConn is a unique cultural attraction featuring exhibits on puppetry arts.


9. Windham County

County Facts

  • Population: 117,335 (2020 Census)
  • Area Codes: 860
  • ZIP Codes: 06226-06350
  • County Seat: Willimantic (historical, no longer active county government)

Geography and History

Windham County, located in the northeastern part of Connecticut, covers 521 square miles and is often referred to as the “Quiet Corner” due to its rural character. The county was established in 1726 and became an important center for textiles during the Industrial Revolution. Willimantic, one of the largest towns in the county, was known for its cotton mills and silk production. Windham County’s economy was largely based on agriculture and manufacturing in the 19th century, but by the 20th century, much of the region became more residential, serving as a quiet retreat from the busier parts of the state.

Colleges and Universities

  • Eastern Connecticut State University (ECSU): A public liberal arts university in Willimantic known for its programs in education, business, and the arts.
  • Quinebaug Valley Community College: Offers associate degrees and technical training, serving students from across northeastern Connecticut.
  • Windham Technical High School: A vocational-technical high school preparing students for careers in various skilled trades.

Major Landmarks

Windham County is known for Roseland Cottage in Woodstock, a historic Gothic Revival house, and Nathan Hale Homestead in Coventry, which was home to the Revolutionary War hero. The Prudence Crandall Museum in Canterbury honors the abolitionist who opened one of the first schools for African American girls in the U.S. Mashamoquet Brook State Park in Pomfret offers hiking trails and camping. Air Line State Park Trail is a popular trail for biking and hiking, offering scenic views of the rural countryside. The Windham Textile & History Museum in Willimantic preserves the history of the county’s textile industry.