Route 104 is a Connecticut state highway in the city of Stamford, starting from the Bulls Head section of the city then through North Stamford, with the highway ending at New York state line.

Route 104 begins at an intersection with Route 137 in the Bulls Head section of Stamford and heads north, passing by GE Capital, then crossing the Rippowam River, up through North Stamford and onto New York state line.

After another 3.2 miles (5.1 km), Route 104 crosses over the Mianus River, through the Long Ridge section of the city, as it heads towards the New York state line.

Route 104 is known as Long Ridge Road throughout its entire length and is classified as a principal arterial road, carrying traffic volumes of as much as 30,000 vehicles per day, particularly near the Merritt Parkway interchange.

It ran from U.S. Route 1 along Bedford Street and Long Ridge Road up to the New York state line.