Welcome to Mark Lyon!

It will be available online for one year

The 2019-20 District Calendar has been approved. The calendar is now available for download on the Texas City ISD website.

Students at TCHS will be required to wear their student ID on a lanyard on their neck at school at all times.

New Administrative Code rules effective May 3, 2018, implement SB 463 and establish a procedure to allow TCISD to determine whether their student qualifies to graduate and receive a high school diploma.