Nearly one in three Northland abortions are for women aged 20 to 24, according to Statistics NZ.
Figures show 532 abortions took place in the Northland region last year, 180 of which were for women in this age group.
Nationally, 15,863 abortions were performed last year, 33 per cent for women aged 20 to 24.
Abortion Law Reform Association of New Zealand (ALRANZ) says contraception should be freely available to all women.
"If we want to lower the abortion rate, the way to do it is not to restrict abortions," member Alison McCulloch said. "It is to ensure there are fewer unplanned and unwanted pregnancies [and] the way to do that is to increase access to contraception and to have education programmes."