Preheat oven to 350 degrees.
Butter and flour a bundt pan.
Whisk flour, baking powder and salt together.
With a electric mixer, beat together sugar and butter until fluffy.
Continue beating, adding eggs, one at a time.
Add vanilla and zest, mix well.
Gradually add in dry ingredients alternating with buttermilk, ending with flour mixture.
Turn off mixer and gently fold in blueberries.
Pour batter into bundt pan.
Bake until a cake tester or wooden skewer comes out clean about 50 minutes to an hour.
Cook cake on rack for 15 minutes.
Turn cake onto cake plate and cool completely before frosting.