San Juan San Juan was founded 1521 Estimated Population 2006  442,447 Land area 122 sq. Km. Housing Units  182,101

Guaynabo

Bayamon Bayamon was founded in 1772 Estimated population 221,546 Land Area 44.38 sq. Km Housing Units 79,476

Carolina Carolina was founded 1857 Estimated Population 187,468 Land area 120.9 sq.Km Housing Units 71,347

Dorado Dorado was founded 1842 Estimated Population 34,017 Land Area 60 sq. Km Housing Units 13,067