For Thyroglossal Cyst Most Common site is
Although Thyroglossal Duct cysts may occur anywhere from the Base of the tongue to the thyroid gland , most are found at or just below the hyoid bone. Source : Sabiston 20th edition Pg : 1862
Suprahyoid
Subhyoid
Foreman caecum
At Thyroid Isthmus
Endocrinology and breast