About 170 thousand people.

Bayamon is a big, lively city just next to San Juan and is one of the most crowded places on the island. People sometimes call it the City of Chicharron because of a famous fried snack.
You can ride the modern Tren Urbano train, visit the science park with dinosaurs and a planetarium, and enjoy busy parks and plazas full of music.
The Luis A. Ferre Science Park has a zoo, model rockets, an art museum, and a planetarium where you can look up at the stars indoors.
Bayamon is famous for crunchy chicharron and other tasty roadside snacks that locals share with big smiles.