Municipalities in Baja California are administratively autonomous of the state according to the 115th article of the 1917 Constitution of Mexico.[3] Their legal framework derives from Title VI of the state Constitution[4] and the state's 2001 Law of the Municipal Regime.[5] Every three years, citizens elect a municipal president (Spanish: presidente municipal) by a plurality voting system who heads a concurrently elected municipal council (ayuntamiento) responsible for providing public services for their constituents.[4] The municipal council consists of a variable number of trustees and councillors (regidores y síndicos) who govern from the municipal seat.[6] Municipalities are responsible for public services (such as water and sewerage), street lighting, public safety, traffic, and the maintenance of public parks, gardens and cemeteries.[7] They may also assist the state and federal governments in education, emergency fire and medical services, environmental protection and maintenance of monuments and historical landmarks. Since 1984, they have had the power to collect property taxes and user fees, although more funds are obtained from the state and federal governments than from their own income.[7] Municipalities may establish functional and geographical subdivisions called delegaciones and subdelegaciones[8] in accordance with Article 29 of the Law of the Municipal Regime.[5]
The largest municipality by population in Baja California and in Mexico is Tijuana with 1,922,523 residents, representing around half (51%) of the population of the state. The smallest municipality by population is San Felipe: the areas which now make up San Felipe recorded a population of 18,369 inhabitants in the 2010 Mexican Census.[9] San Quintín, which spans 32,883.93 km2 (12,696.56 sq mi), is the largest municipality by area in the state and in the country. Playas de Rosarito is the smallest municipality by area spanning 500.67 km2 (193.31 sq mi).[2] The first municipality to incorporate was Ensenada on May 15, 1882[10] and the newest municipality is San Felipe which was formed from Ensenada and Mexicali on January 1, 2022.[11]
Tecate, the least populated municipality before the creation of San Felipe.
The following figures do not take into account the creation of San Felipe in 2022, for which current area and population figures from INEGI are not yet available.
^San Felipe was created from parts of the municipalities of Ensenada and Mexicali on January 1, 2022. INEGI has not yet provided current land area or population figures for San Felipe, or updated the land area and population figures of Ensenada and Mexicali to reflect the change.
^San Quintín was created from the Ensenada Municipality February 12, 2020 and thus does not appear in the 2010 census.[13]