1st federal electoral district of Yucatán

Yucatán gained a congressional seat in the 2023 redistricting process carried out by the National Electoral Institute (INE). Under the new districting plan, which is to be used for the 2024, 2027 and 2030 federal elections,^[6] the first district is located in the east and south-east of the state. It comprises 197 electoral precincts (secciones electorales) across 27 municipalities:^[7][8]

• Cantamayec, Yaxcabá, Cuncunul, Chacsinkín, Chankom, Chemax, Chichimilá, Chikindzonot, Dzitás, Espita, Kaua, Panabá, Peto, Quintana Roo, Río Lagartos, San Felipe, Sucilá, Tahdziú, Calotmul, Tekom, Temozón, Tinum, Tixcacalcupul, Tixméhuac, Tizimín, Uayma and Valladolid.

The head town (cabecera distrital), where results from individual polling stations are gathered together and tallied, is the city of Valladolid. The district had a population of 376,469 in the 2020 census and, with Indigenous and Afrodescendent inhabitants accounting for over 84% of that total, Yucatán's first – like all the state's electoral districts, both local and federal – is classified by the INE as an indigenous district.^[1][a]

2017–2022

Between 1996 and 2022, Yucatán had five federal electoral districts. Under the 2017 scheme, the first district's head town was at Valladolid and it covered 35 municipalities in the east of the state:^[12][11]

• Buctzotz, Calotmul, Cenotillo, Cuncunul, Chankom, Chemax, Chichimilá, Chikindzonot, Dzinzantún, Dzilam de Bravo, Dzilam González, Dzitás, Dzoncauich, Espita, Izamal, Kantunil, Kaua, Panabá, Quintana Roo, Río Lagartos, San Felipe, Sucilá, Sudzal, Tekal de Venegas, Tekom, Temax, Temozón, Tepakán, Tinum, Tixcacalcupul, Tizimín, Tunkás, Uayma, Valladolid and Yaxcabá.

2005–2017

Under the 2005 districting scheme, the district covered 33 municipalities in the east and south-east portions of the state and had its head town at Valladolid.^[13][14]

1996–2005

Between 1996 and 2005, the district's head town was at Valladolid and it covered 35 municipalities in an area broadly similar to its 2005 configuration, but with more of the northern coast and less of the south-eastern border with the state of Quintana Roo.^[15][14]

1978–1996

The districting scheme in force from 1978 to 1996 was the result of the 1977 electoral reforms, which increased the number of single-member seats in the Chamber of Deputies from 196 to 300. Under that plan, Yucatán's district allocation rose from three to four.^[9] The first district had its head town at the state capital, Mérida, and it covered a portion of that city.^[16]