Adjuntas (Spanish pronunciation: [aðˈxuntas]) is a small mountainside municipality in Puerto Rico located central midwest 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 wards and Adjuntas Pueblo (the downtown area and the administrative center of the city). 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 (21 °C) (High: 83 °F/28 °C; Low: 58 °F/14 °C). Puerto Rico's lowest temperature were recorded in Adjuntas at 38°F. 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 code in the United States zip code system.
Although there are petroglyphs and traces of Taíno people in Adjuntas, there is no proof that the region was dominated by a specific cacique. Nearby caciques like Guarionex and Urayoán could have had some control over the area.