What is Texas code for kitchen electrical outlet near sink and cooktop
The NEC has you covered

This limit is set at 20" above the countertop by NEC 210.52(C)(5):


  (5) Receptacle Outlet Location. Receptacle outlets shall
  be located on or above, but not more than 500 mm (20 in.)
  above, the countertop. Receptacle outlet assemblies listed
  for the application shall be permitted to be installed in
  countertops. Receptacle outlets rendered not readily accessible by appliances fastened in place, appliance garages,
  sinks, or rangetops as covered in 210.52(C)(1), Exception,
  or appliances occupying dedicated space shall not be considered as these required outlets.