San Juan is a district of the Tibás canton, in the San José province of Costa Rica. San Juan has an area of 3.56 km² and an elevation of 1,…San Juan is a district of the Tibás canton, in the San José province of Costa Rica. San Juan has an area of 3.56 km² and an elevation of 1,162 metres. For the 2011 census, San Juan had a population of 21,745 inhabitants.