La Paz (pronounced [la ˈpas] , English: "peace") is the capital and largest city of the Mexican state of Baja California Sur, with a 2020 census population of 250,141 inhabitants, making it the most populous city in the state. La Paz City is located in La Paz Municipality—the fourth-largest municipality in Mexico, by area and populace (with a reported 292,241 inhabitants), covering an area of 20,275 km (7,828 sq mi).

For air travelers, La Paz is served by Manuel Márquez de León International Airport, with connecting flights to some of Mexico's main cities (Guadalajara, Mexico City, Monterrey, Tijuana), as well as other destinations across the north-northwest of the country (including Chihuahua City, Ciudad Juárez, Ciudad Obregón, Culiacán, Hermosillo, Mazatlán and Querétaro, among others). Seasonal services to American Airlines hubs Dallas, Texas, and Phoenix, Arizona, are also provided. Additionally, two ferry services operate from the port of Pichilingue, outside the city, connecting the Baja California Peninsula to the eastern mainland at Mazatlán and Topolobampo, Sinaloa (near Los Mochis).

Beginning in November 2024, Alaska Airlines will begin offering twice- to thrice-weekly direct flights between La Paz and Los Angeles, California, with daily flights to Monterrey, Nuevo León, scheduled to begin in February 2025.

The first European known to have landed in Baja California was Fortún Ximénez. In 1533, shortly after the conquest of Tenochtitlan, Hernán Cortés sent two ships, Concepción, under the command of captain and commander of the expedition, Diego de Becerra [es], and San Lázaro under Capt. Hernando de Grijalva, to explore the South Seas of the Pacific Ocean. The ships set out 30 November 1533, to travel north along the coast of New Spain from present-day Manzanillo, Colima, in search of two ships that had been lost without a trace on a similar voyage the previous year. By 20 December the ships had separated; San Lázaro, which had gone ahead, waited three days for Concepción and after no sighting of its companion vessel, Capt. Grijalva dedicated himself to exploring the region and discovered the Revillagigedo Islands. On board the Concepción, Ximénez, the navigator and second in command, led a revolt in which Capt. Becerra was killed in his sleep by Ximénez. Also the crewmen loyal to the murdered captain were attacked and later rebel sailors abandoned both the wounded navigators and the Franciscan friars accompanying the expedition on the coast of present-day Michoacán.

Ximénez sailed to the northwest following the coast and at some point turned west and reached a bay that is now the port of the city of La Paz. Ximénez thought that he had found an island, and never knew that it was a large peninsula. There he met natives who wore few clothes and spoke an unknown language; their culture was very different from that of the inhabitants of the Mexican highlands. The crews of his ships saw the “scantily-clad” women and raped them. The Spaniards soon became aware of the large pearls that the natives extracted from the pearl oysters abounding in the bay, and proceeded to plunder the people and rape the women.

The abuse of the Indian women by the crew and their looting caused a violent confrontation with the natives that ended in the deaths of Ximénez and some of his companions; the survivors withdrew, and sailed erratically for several days until they reached the shores of the present-day Jalisco, where they encountered a subaltern of Nuño de Guzmán, who requisitioned the ship and took them prisoner.

Having sponsored two exploratory voyages in the South Seas just with some giant pearls samples, Cortés decided to lead a third exploration himself. Annoyed that his enemy, Nuño de Guzmán, had requisitioned one of his ships during the first expedition, Cortés decided to confront Guzmán on his own ground and from there set up the third expedition; consequently he prepared a large force of infantry and cavalry to march on the province of New Galicia (Nueva Galicia), of which Guzmán was governor.

The viceroy of New Spain, Antonio de Mendoza, warned Cortés on 4 September 1534, "not to confront he who had requisitioned his ships", a warning which Hernán Cortés ignored, claiming that he had been designated to conquer and discover new territories, and that he had spent more than 100 thousand gold ducats of his own fortune. The feared confrontation between the armies of Cortés and Nuño de Guzmán did not occur.

In Chametla, (Sinaloa), after crossing the present-day states of Jalisco and Nayarit, territory then known as part of New Galicia, Cortés and his entourage embarked the ships Santa Águeda and San Lázaro with 113 crewmen and 40 cavalrymen with their horses and gear, leaving 60 riders on land, as reported to the Real Audiencia and Governor Nuño de Guzmán. Cortés then sailed northwest, and on 3 May 1535 arrived at the bay he named Bahia de la Santa Cruz (Bay of Santa Cruz), currently the port of La Paz, where he confirmed the death of his subordinate, Fortún Ximénez, at the hands of the natives. Once Cortés had taken possession of the bay, he decided to establish a colony and summoned the soldiers and arms he had left in Sinaloa. The transport ships were lost in a storm, however, and only one ship, carrying a load of fifty bushels of corn, returned. This was insufficient to feed the population, so Cortés left to personally secure food, but was unable to procure enough, so he decided to return to New Spain with the intention of supplying the new colony from there.

Francisco de Ulloa was in command of the town of La Paz, but complaints by relatives of those who had stayed on the peninsula caused the viceroy to order the population to abandon the colony and return to New Spain. Following the failure of Cortés' third expedition to establish a colony in the newly discovered lands that belonged to him by royal decree, an enemy of Cortés, whom a writer of the time cites as Alarcón, applied the name "California," drawn from a contemporary novel, to the abandoned territory, perhaps in order to insult Cortés. The Baja California peninsula, the Gulf of California (also known as the Sea of Cortez), and the states of California, Baja California and Baja California Sur, bear the name today.

From 10 January 1854, to 8 May 1854, La Paz served as the capital of William Walker's Republic of Sonora. The project collapsed due to lack of US support and pressure from the Mexican government to retake the region.

La Paz is located on the Baja California peninsula on the Bay of La Paz, 210 kilometres (130 mi) south of Ciudad Constitución, municipality of Comondú, and 202 kilometres (126 mi) north of Cabo San Lucas, municipality of Los Cabos. It is located 81 kilometres (50 mi) north of the town of Todos Santos. Its geographical coordinates are 24°08′32″ N and parallel 110°18′39″W, it has an altitude of 0 to 27 meters above the sea level. It is one of the three state capitals of Mexico that are on the coast of the sea.

La Paz has a subtropical desert climate (BWh). The climate of La Paz is relatively consistent with generally little rainfall, with a year around average temperature of between 17 and 30 °C (63 and 86 °F). Summer months (July–September) typically see highs between 34 and 36 °C (93 and 97 °F) and dew points of 21–23 °C (70–73 °F). The winter months (December–February) are the coldest with temperatures dropping below 15 °C (59 °F) at night, but cold mostly are from 20 to 25 °C (68 to 77 °F). Breezes from Bahía de La Paz moderate the temperature. The bay also acts as a barrier against seasonal storms in the Gulf of California.

Rainfall is minimal at most times of year, although erratic downpours can bring heavy rains. Rain tends to be concentrated in a short, slightly rainier season that peaks in August and September, following the pattern of the North American Monsoon. The driest season, where it is common to have no rain, occurs March through June. La Paz averages over 300 days of sunshine annually and an average of 3148 sunshine hours.

During the summer the cooling Coromuel winds, a weather phenomenon unique to the La Paz area, blow during the night from the Pacific over the Peninsula and into the Bay of La Paz.

As with most of the Gulf of California, the temperature of the water changes substantially over the course of the year, with temperatures around 68 °F (20 °C) during winter and around 85 °F (29 °C) during summer.

Average Sea Temperature

Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
68 °F 20 °C	66 °F 19 °C	68 °F 20 °C	72 °F 22 °C	75 °F 24 °C	79 °F 26 °C	82 °F 28 °C	84 °F 29 °C	86 °F 30 °C	84 °F 29 °C	79 °F 26 °C	72 °F 22 °C

The population of La Paz has grown greatly since the 2000s.

Eco-tourism is by far the most important source of tourism income in La Paz. Tourists also visit the city's balnearios. There are some 900 islands and inlets in the Gulf of California with 244 now under UNESCO protection as World Heritage Bio-Reserves and the Isla Espíritu Santo group, which borders the northeast portion of the Bay of La Paz, the primary tourist destination of the area.

Industries include silver mining, agriculture, fishing and pearls. Tourism is also an important source of employment for this coastal community.

The now defunct airline Aero California had its headquarters in La Paz.

La Paz is served by Manuel Márquez de León International Airport with flights to Mexico's 3 largest cities and the main cities of northwest Mexico on Aeroméxico Connect, Volaris, VivaAerobus, Calafia and TAR airlines; and American Airlines seasonal service to its hubs in Dallas and Phoenix. Two ferry services operate from the port of Pichilingue outside the city, connecting the Baja California peninsula to the mainland at Mazatlán and Topolobampo, near Los Mochis.

Running along the coast in front of La Paz is 5 km (3.1 mi) long Malecon Road. The main purpose of this road is to allow easy movement across the city. However, it quickly became the focal point of tourist related activities with a large number of bars, restaurants and shops opening along its length. Since 2004 extensive development has taken place which included a large sidewalk which offers safety for large numbers of people to walk along the coastal front of La Paz.

In September 2011, a bicycle lane was added to Malecon Road, providing cyclists protection from cars and pedestrians.

La Paz is served mainly by two highways; Mexican Federal Highway 1 that links the south of the state from Cabo San Lucas to the north of the peninsula to Tijuana, and Mexican Federal Highway 19, that connects La Paz with the population of the south pacific towns such as Todos Santos and El Pescadero. It is also served by two secondary roads, the Los Planes highway (286) that connects La Paz with towns such as La Ventana, Ensenada de los Muertos and Los Planes. The other is the Pichilingue highway which links La Paz with its maritime port.

Local specialties are characterized by seafood dishes, especially of lobster, sole, clams and shrimp. Oregano is frequently used as a spice, and damiana, an ingredient in a traditional liqueur, is widely regarded as an aphrodisiac and brewed as a tea.

Regional cuisine also includes traditional dishes such as machaca, made from beef that has been well-cooked, shredded, and then cooked in its own juices, fresh cheeses and the typical flour tortillas. Abundantly available clams are prepared in various ways such as pickling, breading and frying, or stuffing. Shrimp are plentiful also, and eaten grilled, fried, or baked as in the regional specialty, filete imperial de camarones. Other popular seafood dishes include callo garra de león, made with scallops, fish tatemado, and ceviche.

Regional sweets are represented by fruits such as guava, mango and pitaya, green papaya and fig in syrup, as well as dehydrated regional fruits such as white fig and mango. Cheese empanadas (empanadas de queso) and empanadas made with sweet beans are also popular.

The city had a 2020 census population of 250,141 inhabitants, making it the most populous city in the state. Its metropolitan population is somewhat larger because of surrounding towns, such as El Centenario (pop. 6,068), Chametla (pop. 1,731 as of 2010) and San Pedro. Its surrounding municipality, which is the fourth-largest municipality in Mexico in geographical size, reported a population of 290,286 inhabitants.

Historical population

Year	Pop.	±%
1960	24,253	—
1970		—
1980		—
1990	136,759	—
1995	154,314	+12.8%
2000	162,954	+5.6%
2005	189,178	+16.1%
2010	215,178	+13.7%
2015	244,219	+13.5%
Sources:

La Paz is the state capital and center of commerce, as well as the home of the three leading marine biology institutes in Latin America (UABCS, CIBNOR & CICIMAR), largely because it sits on the Gulf of California, which is home to exceptional marine biodiversity. It also supports several other university-level institutes of learning, such as the Universidad Autonoma de Baja California Sur.

La Paz is the headquarters of several higher education centers, the main ones being:

• Universidad Autónoma de Baja California Sur (UABCS)
• Universidad Tecnológica de La Paz (UTLP)
• Instituto Tecnológico de La Paz (ITLP)
• Universidad Mundial (UM)
• Centro Interdisciplinario de Ciencias Marinas (CICIMAR)
• Centro de Investigaciones Biológicas del Noroeste (CIBNOR)
• Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE) Campus La Paz
• Benemérita Escuela Normal Urbana Prof. Domingo Carballo Félix (BENU)
• Escuela Normal Superior del Estado de Baja California Sur (ENSBCS)
• Universidad Internacional de La Paz (UNIPAZ)
• Universidad de Tijuana Campus La Paz (CUT)
• Tecnológico de Baja California
• Universidad Católica Campus La Paz
• Universidad del Desarrollo Profesional (UNIDEP) Plantel La Paz
• Universidad Intercontinental
• Instituto Mar de Cortés
• Instituto Cultural Tecnológico Cuincacalli (ICTEC)
• Centro de Capacitación para el Trabajo Industrial (CECATI 39)
• Escuela Superior de Cultura Física para Baja California Sur (ESCUFI)

La Paz has several medical centers; the Secretariat of Health operates the Juan María de Salvatierra general hospital, which has medical specialists and an exclusive area for pediatric oncology, as well as a unit that provides medical care under the national health insurance program, as well as a hemodialysis unit, a blood bank, a mental health division, health centers and other units. The Mexican Social Security Institute (IMSS) provides a family clinic and an ambulatory medical unit in which ambulatory surgeries are performed. There is also a new ISSSTE hospital, the Naval Sanatorium, and the Secretariat of National Defense hospital, which offers external consultation services, hospitalization and medical specialists.

Reflecting high national rates, there are similarly high local rates of diabetes mellitus, arterial hypertension, and renal insufficiency, as well as of automobile accidents resulting in injury, despite public health dissemination programs and driver education programs.

According to the Baja California Sur State Development Plan 2005-2011, during 2006 there were 24 deaths due to cervical cancer in the state. The health sector seeks to reduce cervical cancer mortality by providing timely treatment to women aged 25 to 64 years, and improving the efficiency of diagnostic laboratories and the monitoring of patients.

As of 1 March 2021, the municipality reported 11,558 recoveries, 577 active cases, and 436 deaths from the COVID-19 pandemic in Mexico.

John Steinbeck visited La Paz in 1940. He describes the town in his 1947 novel The Pearl and mentions it extensively in his 1951 travelogue The Log from the Sea of Cortez.

The city is also the setting of the 1967 Scott O'Dell children's novel The Black Pearl, chosen as a Newbery Honor Book in 1968; La Paz is the home of the main character.

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• Caughey, John W. California, second edition (Englewood: Prentice-Hall, 1953), 45-46.
• Chapman, Charles E. A History of California: The Spanish Period (New York: The MacMillan Co., 1921), 50-51.
• Wilson, J. G.; Fiske, J., eds. (1900). "Becerra, Diego" . Appletons' Cyclopædia of American Biography. New York: D. Appleton.

• Official Ayuntamiento de La Paz (Municipality of La Paz) website (in Spanish)