1907Civil Rights
Mercedes was founded September 15, 1907, by the American Rio Grande Land & Irrigation Company, and was incorporated March 8, 1909.
1909Government
Mercedes incorporated in 1909 and formed a City Council style government.
1916Government
During President Woodrow Wilson's administration, Camp Llano Grande was founded in 1916 southwest of Mercedes.
1917Architecture
Construction of Camp Mercedes on an 80-acre tract southeast of town was completed in early 1917.
1922History
After the armistice, the camp was demobilized and closed in 1922.
1970Government
Colegio Jacinto Treviño located in Mercedes, Texas, was a pioneering Chicano institution of higher education founded in 1970.
2000History
=== 2000 census ===
At the 2000 census, there were 13,649 people, 4,170 households and 3,348 families residing in the city.
2006Architecture
== Shopping ==
The Rio Grande Valley Premium Outlets, owned by Chelsea Property Group which is a brand of Simon Property Group, opened in November 2006.
2007History
It is one of the oldest towns in the Rio Grande Valley, and the city celebrated its centennial in 2007.
2015Education
In 2015, the city joined other cities in south Texas in support of the newly formed University of Texas Rio Grande Valley by adopting a resolution declaring August 31 as UTRGV day.