Where is chlorophyll located in plants?

It's the pigmentation. It's found in the sacs of the chloroplast

Chlorophyll is found in the thylakoid sacs of the chloroplast.

Explanation:

This pigment is responsible for absorbing sunlight required for the production of sugar molecules, and ultimately of all biochemicals, in the plant. The chloroplast is a specialized part of the cell that functions as an organelle.