The 9th federal electoral district of Tamaulipas () is a defunct federal electoral district of the Mexican state of Tamaulipas. It was in existence from 1978 to 1996 and again from 2017 to 2022.
During those periods, it returned one deputy to the Chamber of Deputies for each three-year legislative session by means of the first-past-the-post system. Votes cast in the district also counted towards the calculation of proportional representation ("plurinominal") deputies elected from the country's electoral regions.
The 9th district was first created as part of the 1977 electoral reforms, which increased the state's seat allocation from six to nine. Because of shifting population dynamics, it was subsequently abolished in 1996, re-established in 2017, and abolished again in 2023.
District territory
2017âÂÂ2022
In its final form, the 9th district was located in the north of the state. Its head town (), where results from individual polling stations were gathered together and tallied, was the city of Reynosa and it covered 221 electoral precincts () in the south of the municipality of Reynosa. The remainder of the municipality was assigned to the 2nd district.
1996âÂÂ2017
Between 1996 and 2017, Tamaulipas's seat allocation was reduced to eight.
1978âÂÂ1996
Tamaulipas's seat allocation rose from six to nine under the 1977 electoral reforms, which increased the number of single-member seats in the Chamber of Deputies from 196 to 300. The newly created 9th district's head town was at Ciudad Mante and it covered six municipalities in the south of the state:
*Antiguo Morelos, Gómez FarÃÂas, Mante, Nuevo Morelos, Ocampo and Xicoténcatl.
Deputies returned to Congress
Presidential elections
Notes
References