[2] The county's name comes from the Battle of San Jacinto which secured Texas' independence from Mexico and established a republic in 1836.

[3] The TTC-69 component (recommended preferred) of the once-planned Trans-Texas Corridor went through San Jacinto County.

[4] As of the census[10] of 2000, there were 22,246 people, 8,651 households, and 6,401 families residing in the county.

22.60% of all households were made up of individuals, and 10.10% had someone living alone who was 65 years of age or older.

District 18: Ernest Bailes (R) – first elected in 2016 School districts include Areas of San Jacinto County in Coldspring-Oakhurst CISD and Shepherd ISD are assigned to Angelina College.