Jose Antonio Montalvo was born on 29 Apr 1770, the son of Antonio Montalvo and Maria Petra Salinas.
He married Nestora (Nicolasa) Gonzalez on 1 Jan 1797.
He married Maria Juana Ramirez on 7 Feb 1809.
In 1782, he lived at Las Jaras. The church census recorded that he was a child, español. His household included 14 people:
Don Antonio Montalvo, español, married. He was the ranch owner.
Maria Petra Salinas, española, married.
Maria del Carmen Montalvo, española, an unmarried girl.
Francisco Ignacio Montalvo, español, a youth.
Maria Josefa Montalvo, española, an unmarried girl.
Maria Cirila Montalvo, española, an unmarried girl.
Maria Teodora Montalvo, española, an unmarried girl.
Jose Antonio Montalvo, español, a child.
Maria Rosa Montalvo, española, a child.
Francisco Antonio Montalvo, español, a young child.
Juana Maria Montalvo, española, a young child, age 4.
Maria Gertrudis Montalvo, española, a young child, age 3.
Maria Antonia Montalvo, española, a young child, age 2.
Joaquin Montalvo español, age 48.