The state that shares its northern border with Connecticut is Massachusetts.
Kentucky forms most of the northern border of Tennessee.
Vermont shares its northern border with New York.
Canada.
Washington
West Virginia, Ohio, Illinois, and Indiana form the northern border of Kentucky, along the Ohio River.
New Hampshire does it all
The Connecticut River forms the state line between New Hampshire and Vermont.
Rio Grande forms the Southern border of the United states.
The Connecticut River, which flows into Long Island Sound.
The Connecticut river which forms the border of New Hampshire and Vermont except a couple towns in the extremem northern part of each state near the 3 Connecticut lakes that serves as it's water sou.rce
Yes, Connecticut is in the northern hemisphere, along with the rest of the state of Connecticut and most of the United States. The northern hemisphere includes all land and water north of the equator.