San Juan is located a few miles north of Espanola.

According to the United States Census Bureau, the CDP has a total area of 0.6 square mile (1.5 km2), all land.

As of the census[2] of 2000, there were 592 people, 193 households, and 152 families residing in the CDP.

There were 227 housing units at an average density of 397.2 per square mile (153.4/km2).

19.2% of all households were made up of individuals, and 6.2% had someone living alone who was 65 years of age or older.