Fairfield County is a county in the southwestern corner of the U.S. state of Connecticut. It is the most populous county in the state and was also its fastest-growing from 2010 to 2020. As of the 2020 census, the county's population was 957,419, representing 26.6% of Connecticut's overall population. The closest to the center of the New York metropolitan area, the county contains four of the state's seven largest cities—Bridgeport (first), Stamford (second), Norwalk (sixth) and Danbury (seventh)—whose combined population of 433,368 is nearly half the county's total population.
Interstate 89 (I-89) is an Interstate Highway in the New England region of the United States traveling from Bow, New Hampshire, to the Canada–United States border between Highgate Springs, Vermont, and Saint-Armand, Quebec. As with all odd-numbered primary Interstates, I-89 is signed as a north–south highway. However, it follows a primarily northwest-to-southeast path. The route forms a major part of the main connection between the cities of Montreal and Boston. In Quebec, the route continues as Route 133. The eventual completion of Autoroute 35 will lead to a nonstop limited-access highway route between Boston and Montreal, following I-93 south from I-89's terminus. The largest cities directly served by I-89 are Concord, the state capital of New Hampshire; Montpelier, the state capital of Vermont; and Burlington, Vermont. I-89 is one of three main Interstate highways whose route is located entirely within New England, along with I-91 and I-93.
U.S. Route 202 (US 202) is a spur route of US 2. It follows a northeasterly and southwesterly direction stretching from Delaware in the south to Maine in the north and traveling through the states of Pennsylvania, New Jersey, New York, Connecticut, Massachusetts, and New Hampshire. The highway has borne the number 202 since at least 1936. Before this, sections of the highway were designated U.S. Route 122, as it intersected US 22 in New Jersey. It intersects its parent route, US 2, in Bangor, Maine.
U.S. Route 6 (US 6) or U.S. Highway 6 (US 6), also called the Grand Army of the Republic Highway, honoring the American Civil War veterans association, is a main route of the United States Numbered Highway System. While it currently runs east-northeast from Bishop, California, to Provincetown, Massachusetts, the route has been modified several times. The highway's longest-lasting routing, from 1936 to 1964, had its western terminus at Long Beach, California. During this time, US 6 was the longest highway in the country.
U.S. Route 3 (US 3) is a United States Numbered Highway running 277.90 miles (447.24 km) from Cambridge, Massachusetts, through New Hampshire, to the Canada–United States border near Third Connecticut Lake, where it connects to Quebec Route 257.
U.S. Route 4 (US 4) is a 253-mile-long (407 km) United States Numbered Highway that runs from East Greenbush, New York, in the west to Portsmouth, New Hampshire, in the east, traversing Vermont.
Route 15 is a state highway in the U.S. state of Connecticut that runs 83.53 miles (134.43 km) from a connection with New York's Hutchinson River Parkway in Greenwich, Connecticut, to its northern terminus intersecting with Interstate 84 (I-84) in East Hartford, Connecticut. Route 15 consists of four distinct sections: the Merritt Parkway, the Wilbur Cross Parkway, most of the Berlin Turnpike, and part of the Wilbur Cross Highway. The unified designation was applied to these separate highways in 1948 to provide a continuous through route from New York to Massachusetts. The parkway section of Route 15 is often referred to locally as "The Merritt".
Interstate 84 (I-84) is an Interstate Highway in the Northeastern United States that extends almost 233 miles from Dunmore, Pennsylvania, near Scranton at an interchange with I-81 east to Sturbridge, Massachusetts, at an interchange with the Massachusetts Turnpike (I-90). Among the major cities that the road passes through is Hartford, Connecticut, and the road provides a major portion of the primary route between New York City and Boston. Another highway named I-84 is located in the Northwestern United States.
The New England road marking system was a regional system of marked numbered routes in the six-state region of New England in the United States. The routes were marked by a yellow rectangular sign with black numbers and border. Many signs were painted on telephone poles. The routes were approved by the highway departments of the six New England states in April 1922.
New Hampshire Route 101 is a state-maintained highway in southern New Hampshire extending from Keene to Hampton Beach. It is the major east–west highway in the southern portion of the state. Most of its eastern portion is a major freeway linking the greater Manchester area to the Seacoast Region. At 95.189 miles (153.192 km) in length, NH 101 nearly spans the entire width of southern New Hampshire.
Interstate 95 (I-95) is the main north–south Interstate Highway on the East Coast of the United States, running in a general east–west compass direction for 111.57 miles (179.55 km) in Connecticut, from the New York state line to the Rhode Island state line. I-95 from Greenwich to East Lyme is part of the Connecticut Turnpike, during which it passes through the major cities of Stamford, Bridgeport, and New Haven. After leaving the turnpike in East Lyme, I-95 is known as the Jewish War Veterans Memorial Highway and passes through New London, Groton, and Mystic, before exiting the state through North Stonington at the Rhode Island border and goes on.
Route 25 is a 28.59-mile (46.01 km), primary state highway connecting the city of Bridgeport and the town of Brookfield in the U.S. state of Connecticut. Route 25 is a six-lane freeway from Bridgeport to northern Trumbull and a two-lane surface road the rest of the way to Brookfield.
Route 67 is a secondary state highway in the U.S. state of Connecticut, from the town of New Milford in the Greater Danbury area to the town of Woodbridge in the outskirts of New Haven. The route runs for 31.00 miles (49.89 km). It generally follows a northwest-southeast path, and is signed north-south.
U.S. Route 6 (US 6) within the state of Connecticut runs for 116.33 miles (187.21 km) from the New York state line near Danbury to the Rhode Island state line in Killingly. West of Hartford, the route either closely parallels or runs along Interstate 84 (I-84), which has largely supplanted US 6 as a through route in western Connecticut. East of Hartford, US 6 serves as a primary route for travel between Hartford and Providence.
U.S. Route 4 (US 4) in the U.S. state of Vermont extends for 66.059 miles (106.312 km) between the New York state line at Fair Haven and the New Hampshire state line at White River Junction. It is one of the main arteries between New York and New Hampshire.
U.S. Route 7 (US 7) is a north–south highway extending from southern Connecticut to the northernmost part of Vermont. In Vermont, the route extends for 176 miles (283 km) along the western side of the state as a mostly two-lane rural road, with the exception of an expressway section between Bennington and East Dorset. US 7 is known as the Ethan Allen Highway for its entire length through the state, named after the US Revolutionary War general. US 7 ends at an interchange with Interstate 89 (I-89) in the town of Highgate, just south of the Canada–United States border. I-89 continues to the border crossing.
In Connecticut, U.S. Route 202 is usually signed as an east–west route. It enters from the New York state line in Danbury overlapped with U.S. Route 6 and ends at the Massachusetts state line in Granby overlapped with Route 10. Although the route serves no major city centers for most of its run, with the largest city being Danbury, it does pass through Hartford County, serving the northern fringe of Greater Hartford. US 202 is overlapped with other routes for most of its length.
U.S. Route 7 (US 7) is a north–south United States Numbered Highway which runs 78 miles (126 km) in the state of Connecticut. The route begins at Interstate 95 (I-95) in Norwalk starting out as a four-lane freeway until the Wilton town line. The route then proceeds north as a two-lane surface road through Redding and Ridgefield, where it becomes a four-lane surface road until it reaches Danbury. The route becomes a four-lane freeway again, eventually merging with I-84 for a brief period before it turns and proceeds north with US 202 in Brookfield. The freeway section terminates at an intersection with US 202 at the Fairfield–Litchfield county line next to Candlewood lake. The route then continues north as a four-lane arterial road to New Milford, where it becomes a two-lane surface road, running north to the Massachusetts border in North Canaan. US 7 was aligned to its current route around 1930, and, since then, three sections totaling around 12 miles (19 km) have been upgraded to freeway standards.
U.S. Route 7 (US 7) in of Massachusetts is a 54-mile (87 km) section of the larger federal route extending from southern Connecticut to the northernmost part of Vermont. The entire route in Massachusetts is within Berkshire County.
Interstate 84 (I-84) is an east–west Interstate Highway across the state of Connecticut through Danbury, Waterbury, Hartford, and Union.
I-95 in Norwalk, CT 
I-89 near Highgate Springs, VT 
