Adjuntas is a small mountainside town and municipality in Puerto Rico located central midwestern portion of the island on the Cordillera Central, north of Yauco, Guayanilla and Peñuelas; southeast of Utuado; east of Lares and Yauco; and northwest of Ponce. Adjuntas is spread over 16 barrios and Adjuntas Pueblo. Adjuntas is about two hours by car westward from the capital, San Juan. It is the principal city of and comprises the Adjuntas Micropolitan Statistical Area.
Adjuntas is nicknamed "the Switzerland of Puerto Rico", because of its relatively chilly weather. Many Puerto Rican mountain towns have cooler weather than the rest of the island; Adjuntas is no exception: the average yearly weather is 70 °F. Puerto Rico's lowest temperature were recorded in Adjuntas at 38°F in 2018. Its mild climate attracts a good number of island tourists during the summer months. The town has a small hotel named Monte Rio and a good-sized parador, or country inn, called Villa Sotomayor.
Adjuntas' ZIP Code, 00601, is the lowest standard ZIP code in the United States ZIP code system.