You Do Need power plug adapter while traveling from Dominican Republic to Sint Maarten.

Here is Why You Need An Adapter

The outlet and plug type used in Sint Maarten are A and B and in Dominican Republic are A, B and C. This is how they look like.

Dominican Republic

In Dominican Republic, outlets of type A, B and C are in use.

Type A

Type B

Type C

Sint Maarten

In Sint Maarten, outlets of type A and B are in use.

Type A

Type B