787 Area Code: San Juan, Puerto Rico

Puerto Rico is served principally by the 787 area code, the original code for the territory and the most widely associated with Puerto Rican phone numbers. San Juan, the territorial capital and largest city, anchors the directory's records here. San Juan sits on the northern coast of the island, organized around two distinct districts — the historic core of Old San Juan, set on a small islet that holds a famously preserved Spanish colonial fortified town, and the broader modern city that extends along the coast and inland into the surrounding municipalities of Bayamón, Carolina, and Guaynabo. The 787 designation joins Puerto Rico to the same dialing framework used across the United States.

Because 787 covers Puerto Rico in its entirety, the directory's records associated with 787 numbers do not surface a recurring set of secondary cities through the standard cross-state linkage patterns that dominate larger codes. Where other-place names do appear, they reflect the same kinds of public-record dynamics seen elsewhere — numbers porting between carriers, addresses tied to multiple residences, and prior registrations surfacing alongside current ones. The directory currently documents 590 distinct prefixes within 787 in detail, a working subset of the prefix population the code actually carries.

San Juan's median age sits notably above the US figure, in the mid-forties, a pattern shaped in part by population dynamics that have differed considerably from the fifty states. Median household income runs dramatically below the national reading. Home values come in below the US median, and population places San Juan as the largest city in Puerto Rico — the anchor of a metropolitan area that takes in a substantial share of the territory's overall population.