The municipalities of Puerto Rico (Spanish: municipios de Puerto Rico) are the second-level administrative divisions in the Commonwealth of Puerto Rico. There are 78 such administrative divisions covering all 78 incorporated towns and cities. Each municipality is led by a mayor and divided into barrios, third-level administrative divisions, though the latter are not vested with any political authority. Every municipality is governed as stated by the Autonomous Municipalities Act of 1991, which establishes that every municipality must have an elected strong mayor with a municipal legislature as the form of government. Each legislature must be unicameral, with the number of members related to adequate representation of the total population of the municipality. In contrast to other jurisdictions, both the mayors and the municipal legislators are elected on the same date and for the same term of four years in office.

From a political and ekistic perspective, several differences and similarities exist between municipalities of differing population sizes. For instance, municipalities with 50,000 inhabitants or more are considered incorporated cities, while those with fewer than 50,000 are considered incorporated towns.^[1] Size affects the autonomy exercised by the jurisdiction: cities provide and manage their own services, while towns typically depend on nearby cities for certain services. Demographically, municipalities in Puerto Rico are equivalent to counties in the United States, and Puerto Rican municipalities are registered as county subdivisions in the United States census.^[2] Statistically, the municipality with the largest number of inhabitants is San Juan, with 342,259, while Culebra is the smallest, with around 1,792. Arecibo is the largest in terms of geography, with around 125 mi², and Cataño the smallest, with around 4.8 mi².^[3]

All municipalities have a barrio called pueblo proper, officially called barrio-pueblo (literally "district-town"), which typically is the site of the historic Spanish colonial settlement, administrative center and urban core of the municipality.^[4] Municipalities with large populations, however, may have an urban core that consist of several barrios.

Just like in Spain, in Puerto Rico the municipality is not "merely a city, but something similar to a wide-extending township in New England—like Plymouth, Massachusetts, or Barnstable, on Cape Cod comprising a central town or city with perhaps several outlying districts or barrios, usually rural in character, and occasionally having sizeable concentrated populations in villages, the municipality bearing the name of the central urban portion and all under one local government."^[5] Because Puerto Rico was a Spanish colony until 1898, its system of local government bears more resemblance to that of the Hispanophone nations of the Americas than to local government in the United States. Thus, there are no literal first-order administrative divisions akin to counties, as defined by the U.S. Federal Government; instead, Puerto Rico has 78 municipalities as the secondary unit of administration.^[6] For U.S. Census purposes, the municipalities are considered county equivalents. The municipalities are grouped into eight electoral districts, but these do not possess administrative functions. In 1991, the Autonomous Municipalities Act was passed, which slightly modified the rights and responsibilities of Puerto Rican municipalities with the aim of decentralizing control and improving government services.^[7]

Every municipality is composed of barrios, except for Florida, which has only one barrio. The municipality of Ponce has the largest number of barrios, 31.^{[8][9][10][11][12]}

Every municipality (except San Juan) also has an urban area made up of one or more barrios.^[13] When the urban area is made up of only one barrio, it is called "Barrio Pueblo". Some urban areas are made up of multiple barrios: Ponce's urban area, for example, is made up of 12 barrios. All of San Juan's barrios are urban barrios, and the municipality of San Juan is composed of urban barrios only - thus, the entire municipality of San Juan consists of one large urban zone.^[14]

The municipalities elect a mayor and a municipal legislature in the general elections every four years.

• Municipalities with more than 100,000 inhabitants
• San Juan, the largest municipality and capital of Puerto Rico.
• Bayamón, the second largest municipality of Puerto Rico, located just west of San Juan.
• Carolina, the third largest municipality of Puerto Rico, located just east of San Juan.
• Ponce, the fourth largest municipality of Puerto Rico and the largest municipality outside the San Juan metropolitan area.
• Caguas, the fifth largest municipality of Puerto Rico and the largest landlocked municipality.

Racial composition

This section needs to be updated. (September 2021)

The following is an alphabetical list of the municipalities and their population together with a breakdown of their racial composition.

More information Municipality (2020), Black (Both Hispanic and Non-Hispanic) ...

Municipality (2020)	White (both Hispanic and Non-Hispanic)[19][20]	Black (Both Hispanic and Non-Hispanic)[21]	Amerindian (Both Hispanic and Non-Hispanic)	Asian (Both Hispanic and Non-Hispanic)	Two or more races or some other race (Both Hispanic and Non-Hispanic)	Hispanic (Of any Race)
Adjuntas	22.2	3.4	4.2	0.1	65.1	99.7
Aguada	22.7	4.1	3.0	0.2	63.5	99.3
Aguadilla	21.0	4.1	3.5	0.2	62.9	98.4
Aguas Buenas	14.5	7.2	3.3	0.3	61.4	99.5
Aibonito	19.4	5.4	3.3	0.1	64.8	99.1
Añasco	18.4	5.7	3.4	0.2	63.9	99.0
Arecibo	19.0	4.6	2.2	0.2	66.6	99.3
Arroyo	11.5	12.5	1.9	0.4	60.4	99.1
Barceloneta	15.8	4.1	2.4	0.2	67.4	99.5
Barranquitas	20.8	5.2	2.1	0.1	66.2	99.7
Bayamón	17.9	6.2	3.0	0.3	62.5	99.0
Cabo Rojo	20.3	3.8	2.8	0.2	65.7	98.8
Caguas	15.9	6.3	3.1	0.3	63.9	99.2
Camuy	22.7	3.8	3.0	0.1	64.2	99.1
Canóvanas	13.4	15.1	2.6	0.3	50.3	99.3
Carolina	14.2	11.6	2.6	0.4	55.5	98.5
Cataño	13.0	8.2	2.9	0.3	62.0	99.0
Cayey	17.4	6.3	2.5	0.2	65.3	99.4
Ceiba	16.0	9.8	2.6	0.4	57.2	98.2
Ciales	20.8	2.9	2.1	0.3	69.6	99.5
Cidra	19.5	6.8	2.7	0.1	62.6	99.5
Coamo	20.0	7.4	2.8	0.2	61.6	99.4
Comerío	16.9	6.4	4.1	0.2	63.3	99.6
Corozal	19.8	3.7	2.5	0.2	67.7	99.5
Culebra	17.7	8.0	1.7	1.1	51.8	89.2
Dorado	17.6	7.5	3.1	0.6	58.1	96.6
Fajardo	14.5	9.3	2.5	0.4	61.3	98.2
Florida	13.8	2.1	1.4	0.3	74.9	99.5
Guánica	17.1	5.2	2.7	0.2	67.2	99.1
Guayama	19.0	9.6	2.6	0.2	56.6	99.3
Guayanilla	18.1	5.1	3.6	0.1	64.7	99.6
Guaynabo	17.2	4.8	2.6	0.4	66.2	97.9
Gurabo	15.2	7.1	3.3	0.2	61.8	99.2
Hatillo	21.2	3.5	2.5	0.2	66.1	99.2
Hormigueros	18.8	5.1	2.8	0.2	65.0	99.2
Humacao	13.5	8.8	2.5	0.3	62.4	98.0
Isabela	17.5	4.0	2.4	0.2	67.1	98.7
Jayuya	23.3	2.4	3.3	0.1	65.8	99.5
Juana Díaz	14.5	8.0	2.7	0.2	63.8	99.5
Juncos	13.0	9.3	2.9	0.2	61.0	99.4
Lajas	18.9	4.1	2.6	0.2	67.4	99.3
Lares	20.5	2.2	2.5	0.1	70.1	99.3
Las Marías	17.2	3.5	3.1	0.3	69.4	99.2
Las Piedras	15.6	8.3	2.9	0.2	60.3	99.4
Loíza	5.8	31.8	1.6	0.2	27.7	99.4
Luquillo	17.2	12.1	2.7	0.3	54.1	97.1
Manatí	17.1	4.3	2.2	0.2	67.8	99.3
Maricao	22.2	7.8	3.7	0.5	61.0	99.5
Maunabo	9.1	16.7	2.0	0.2	56.0	99.4
Mayagüez	19.7	4.6	3.0	0.3	63.2	98.7
Moca	17.0	3.1	2.6	0.1	70.8	99.6
Morovis	19.1	3.4	2.5	0.2	69.4	99.6
Naguabo	13.3	9.2	2.4	0.2	63.2	99.2
Naranjito	20.7	6.4	3.3	0.2	61.0	99.6
Orocovis	16.3	5.3	6.4	0.2	62.6	99.6
Patillas	15.9	12.3	2.6	0.2	57.2	99.3
Peñuelas	23.1	6.7	3.8	0.1	57.2	99.5
Ponce	19.0	4.9	3.0	0.3	64.4	99.1
Quebradillas	25.4	3.4	3.2	0.2	62.6	99.2
Rincón	21.4	5.9	4.9	0.2	58.5	94.9
Río Grande	14.7	14.7	2.6	0.3	50.4	98.8
Sabana Grande	19.9	4.0	2.4	0.2	66.6	99.4
Salinas	16.3	9.8	3.8	0.2	57.6	99.2
San Germán	18.5	4.6	3.8	0.3	64.1	99.2
San Juan	14.4	8.2	2.7	0.5	60.2	97.8
San Lorenzo	14.0	6.6	2.7	0.2	66.0	99.5
San Sebastián	19.2	2.1	2.9	0.1	70.4	99.4
Santa Isabel	15.7	8.2	2.6	0.2	60.8	99.4
Toa Alta	16.2	5.8	2.7	0.2	65.8	99.4
Toa Baja	16.3	10.1	2.2	0.3	59.1	99.0
Trujillo Alto	14.2	8.0	2.3	0.2	62.6	99.1
Utuado	21.6	2.4	4.0	0.2	66.3	99.2
Vega Alta	12.4	7.3	2.4	0.3	66.6	98.8
Vega Baja	18.5	6.4	3.5	0.2	61.2	99.3
Vieques	18.8	15.2	2.6	0.4	52.2	92.0
Villalba	15.5	6.2	2.9	0.2	65.4	99.6
Yabucoa	16.5	9.7	2.6	0.2	60.6	99.4
Yauco	21.4	4.7	3.2	0.2	63.5	99.4
Puerto Rico	17.1	7.0	2.8	0.3	62.3	98.9

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In 2012, 36 of the 78 municipalities (46%) were experiencing a budget deficit.^[22] In total, the combined debt carried by the municipalities stands at about US$590 million.^{[lower-alpha 1]}

Multiple times, politicians have discussed and proposed consolidating Puerto Rico's municipalities but so far no proposals has been adopted. In 1902 the Puerto Rico legislature, under pressure from the U.S.-appointed governor of Puerto Rico, passed a law consolidating the then-76 municipalities of Puerto Rico into 46.^[25] The law was repealed three years later.^[26][27] In October 2009, a Puerto Rican legislator proposed a bill that would reduce the current 78 municipalities of Puerto Rico down to 20. The bill called for a referendum to take place on June 13, 2010, which would let the people decide on the matter.^[28] However, the bill never made into law.^[29] With the Puerto Rican government-debt crisis that emerged in the first half of 2010s, a new plan to consolidate municipalities was again circulated in the legislature in 2017 as a way to alleviate the government debt crisis.^[30][31] In March 2019, then Governor Ricardo Rosselló created an initiative that would preserve the existing municipalities but create regional consolidation by sharing service overhead in the form of counties but he resigned prior to anything coming of his proposal.^[32]

• es:Organización territorial de Puerto Rico