The de Blasio administration managed to boost enrollment in after-school programs for middle-schoolers this year — but still fell short of its lofty goals, a Post ­review found.

On Wednesday, the Mayor’s ­Office boasted that enrollment had reached “121 percent” for the 75,000 city-funded after-school seats available, but atypically didn’t hold a press conference to tout the achievement.

It turns out the 91,204 enrollment figure doesn’t meet any earlier targets announced by the administration, like the nearly 120,000-seat goal in a March 2014 press release and white paper.

After the state failed to provide the full funding sought by the ­administration, the city quietly stretched the one-year effort to two years, while amending this year’s goal to 107,000. More ­recently, de Blasio reduced the ­enrollment target even further, putting it at “almost 100,000.”

Department of Youth and Community Development officials say comparing the figures is unfair — like comparing apples and ­oranges — and say the city is planning to enroll more students at 2,500 non-public-school sites that were announced this week.

They said when 5,000 seats are added in September, they expect to hit an enrollment of roughly 105,000 middle-schoolers in after-school programs.