Twin cities are a special case of two neighboring cities or urban centres that grow into a single conurbation – or narrowly separated urban areas – over time. There are no formal criteria, but twin cities are generally comparable in status and size, though not necessarily equal; a city and a substantially smaller suburb would not typically qualify, even if they were once separate. Tri-cities and quad cities are similar phenomena involving three or four municipalities.
Oaxaca, officially the Free and Sovereign State of Oaxaca, is one of the 32 states that compose the Federative Entities of Mexico. It is divided into 570 municipalities, of which 418 are governed by the system of usos y costumbres with recognized local forms of self-governance. Its capital city is Oaxaca de Juárez.
Toa Baja is a town and municipality of Puerto Rico located in the northern coast, north of Toa Alta and Bayamón; east of Dorado; and west of Cataño. Toa Baja is spread over five barrios, including Toa Baja Pueblo. Toa Baja is part of the San Juan-Caguas-Guaynabo Metropolitan Statistical Area. Toa Baja is located fifteen minutes by car from San Juan and two hours from Ponce.
Sanlúcar de Barrameda, or simply Sanlúcar, is a city in the northwest of Cádiz province, part of the autonomous community of Andalucía in southern Spain. Sanlúcar is located on the left bank at the mouth of the Guadalquivir River opposite the Doñana National Park, 52 km from the provincial capital Cádiz and 119 km from Sevilla capital of the autonomous region Andalucía. Its population is 68,656 inhabitants.
Villavicencio is a city and municipality in Colombia. The capital of Meta Department, it was founded on April 6, 1840. The municipality had a population of 531,275 in 2018. The city is located at 4°08'N, 73°40'W, 75 km southeast of the Colombian capital city of Bogotá (DC) by the Guatiquía River. It is the most important commercial center in the Llanos Orientales of Colombia.
Vila Real de Santo António is a city, civil parish, and municipality in the Algarve, Portugal. The population in 2011 was 19,156, in an area of 61.25 km2. It is one of the few municipalities in Portugal without territorial continuity: its territory comprises two parts, with the municipal seat located in the eastern part. Vila Real de Santo António was founded after the 1755 Lisbon earthquake, and largely expanded in 1774 using the same architectural and construction techniques employed in the reconstruction of Lisbon after the disaster.
Cuajinicuilapa is the head town of the municipality of the same name in the Costa Chica region of the Mexican state of Guerrero. A low-lying area, it borders the Pacific Ocean and the state of Oaxaca. The municipality has the state's largest population of Afro-Mexicans with most of the population of this ethnicity. The town and municipality are highly socioeconomically marginalized and it is the poorest municipality of the state, with the economy dependent on livestock and fishing.
Cavalcante is a town located in the northern state of Goiás, Brazil. It used to be a big gold producer during the colonial times, but today Cavalcante is more known by its natural beauties, rivers and waterfalls. It is home to a large number of quilombolas, communities of descendants of African-Brazilians who managed to escape from slavery.
Llanera is a municipality in the Autonomous Community of the Principality of Asturias, Spain. It is bordered on the north by Gijón and Corvera de Asturias, on the south by Oviedo, on the east by Gijón and Siero, and on the west by Illas and Las Regueras. Its capital is located 11 km from Oviedo, 20 km from Avilés, and 22 km from Gijón.
Las Regueras is a municipality in the Autonomous Community of the Principality of Asturias, Spain. It is bordered on the north by Illas and Llanera, on the south by Grado, on the west by Candamo, and on the east by Oviedo and Llanera.
Cantalapiedra is a village and municipality in the province of Salamanca, western Spain, part of the autonomous community of Castile and León. It is located 50 kilometres (31 mi) from the city of Salamanca and has a population of 1250 people. The municipality covers an area of 25 km2 (9.7 sq mi).
Canals is a municipality in the comarca of Costera in the Valencian Community, Spain.
Guadalupe is a town and municipality in the Santander Department in northeastern Colombia. It was founded in 1715 by the family Camacho Sabidos, in the lead of the Spanish Captain José Camacho Sabidos and management of Don Juan de Herrera and Tovar, according to church records of the year 1713.
Nava de Roa is a municipality and town located in the municipality of Ribera del Duero, province of Burgos, Castile and León, Spain. It is located 92 km from Burgos, 26 km from Aranda de Duero, and 70 km from Valladolis. According to the 2004 census (INE), the municipality has a population of 246 inhabitants.
Jocotitlán is a municipality located in the northwestern part of the State of Mexico on the central highlands of the country of Mexico. The municipal seat is the town of Jocotitlán and is located at the foot of the Jocotitlán or Xocotépetl volcano, while most of the rest of the municipality is in the Ixtlahuaca Valley. The area has culturally been Mazahua since the pre-Hispanic period, with this indigenous group's traditions strongest in a number of smaller communities in the municipality. Jocotitlán is also home to the Pasteje Industrial Park, which was established in the 1960s, and began the industrialization of the economy. Today, about half of the municipality is employed in industry.
Lucky Lake is a village in the Canadian province of Saskatchewan within the Rural Municipality of Canaan No. 225 and Census Division No. 7. The Village is located at the junction of Highway 42, Highway 45 and Highway 646 approximately 90 km northeast of Swift Current, Saskatchewan.
Almolya del Río is a town and municipality located in the State of Mexico 26 km from the state capital of Toluca. It is located 2,600 meters above sea level. The name Almoloya comes from the Nahuatl phrase almoloyán which means place where water flows out. "del Rio" means "of the river" in Spanish and refers to the Lerma River, which originates here.
Xochistlahuaca is a town in Xochistlahuaca Municipality located in the southeast corner of the Mexican state of Guerrero. It is part of the state's Costa Chica region and while near the Pacific Ocean, most of the territory is mountainous. The population is dominated by the indigenous Amuzgo ethnicity, whose women are noted for their traditional hand woven garments, especially the huipil, which is made both for home use and for sale outside the area.
Torà is a town and municipality in the North East of the comarca (county) of Solsonès, in the province of Lleida, Catalonia, Spain. The urban structure of the center has retained most of its original design, with narrow, twisting streets and blocks formed by rows of attached buildings. The Medieval town grew around a castle or fortified place. A particular trait of the fortified origin of the town is the presence of a number of portals to allow several streets their pass through defensive barriers formed by the rows of buildings of the town and its walls. Torà is some 10 kilometers northeast from the more populated Guissona, a neighbor town that has experienced an important economic development in the last half century parallel to an unprecedented demographic growth sped up in the recent years.
Aceituna is a municipality in the province of Cáceres and autonomous community of Extremadura, Spain. The municipality covers an area of 620 square kilometres (240 sq mi) and as of 2011 had a population of 620 people.
Spain 
Valencian Community 
