The club is planning to continue the groundbreaking offers, by setting up a two-for-one deal next season if the current 9,000 adult season ticket holders sign up again.
City's current attendance is more than three times higher than the League Two's average of 4,212 and several other clubs are believed to be considering a similar scheme for next year.
Bantams manager Stuart McCall said: "We keep saying it but the backing we get is tremendous. Not just at home but when we go away we take around 1,000 with us every time."