San Juan–Caguas–Guaynabo metropolitan area
The San Juan metropolitan area is a United States Census Bureau defined metropolitan statistical area (MSA) in northeastern Puerto Rico centered around the city of San Juan. A July 1, 2009, Census Bureau estimate placed the population at 2,617,089, a 4.31% increase over the 2000 census figure of 2,509,007. San Juan Metro Area (Área Metro). The unofficial but colloquial San Juan metropolitan area (in Spanish; "área metropolitana de San Juan", abbreviated AMSJ), also referred to as the Área Metro is the sprawling area surrounding the Municipality of San Juan which includes San Juan and  its conurbation of the municipalities of Bayamón, Carolina, Cataño, Guaynabo and Trujillo Alto, and in some cases it also includes Toa Baja (particularly the suburb of Levittown). After San Juan, many of these municipalities are the most populous in the commonwealth of Puerto Rico. It represents the inner urban area of the metropolitan statistical area of San Juan. This urban area is also known as the "Área metro de Puerto Rico" based on the misconception that San Juan is the only urbanized metropolitan area in the island. Municipalities in the San Juan–Caguas–Guaynabo metropolitan area. San Juan–Caguas–Guaynabo  metropolitan area is the largest metropolitan area (by population) in Puerto Rico, covering approximately half of the island. Its principal cities are San Juan, Bayamón and Carolina. A total of forty-one municipalities (Spanish: "municipios") are included as part of the San Juan–Caguas–Guaynabo MSA. The total area for the MSA is 1,902.45 square miles. As of 2020, the San Juan metropolitan statistical area is the 35th most populated MSA (slightly smaller than Greater Cleveland but larger than San Jose metropolitan area in population). Combined Statistical Area. The San Juan-Caguas-Fajardo Combined Statistical Area (CSA) includes two metropolitan  areas, one micropolitan area, and forty-five municipalities. A July 1, 2009 Census Bureau estimate placed the population at 2,732,036, a 4.16% increase over the 2000 census figure of 2,622,876. The San Juan-Caguas-Fajardo Combined Statistical Area comprises 68.9% of Puerto Rico's total population. As of 2020, the San Juan combined statistical area is the 29th largest CSA (slightly smaller than Indianapolis and larger than Las Vegas in population).