Dillon is a home rule municipality in Summit County, Colorado, United States. The population was 802 at the 2000 census.
Dillon is located at 39°37′40″N 106°2′39″W / 39.62778°N 106.04417°W / 39.62778; -106.04417 (39.627659, -106.044199).
According to the United States Census Bureau, the town has a total area of 2.4 square miles (6.2 km²), of which, 1.5 square miles (4.0 km²) of it is land and 0.9 square miles (2.2 km²) of it (35.71%) is water. Dillon Dam and its reservoir (Lake Dillon) are nearby. The continental divide is approximately 10 miles (16 km) east.