As of 2022, 98.5% of Terrebonne Parish, LA residents were US citizens, which is higher than the national average of 93.5%. In 2021, the percentage of US citizens in Terrebonne Parish, LA was 98.5%, meaning that the rate of citizenship has been increasing.

The following chart shows US citizenship percentages in Terrebonne Parish, LA compared to that of it's neighboring and parent geographies.