The coordinates 20° North, 155° West fall in the middle of the Pacific Ocean. There are no major islands located at those exact coordinates.

However, you're likely looking for islands nearby. Here are some possibilities depending on what you mean by "nearby":

* Hawaii: The main Hawaiian Islands are located to the northwest, roughly between 19°N and 22°N and 155°W and 160°W.

* French Polynesia: Some of the islands of French Polynesia, like Tahiti, lie to the south, closer to 17°S and 150°W.

* Midway Atoll: This U.S. territory is located to the north, around 28°N and 177°W.

To be more precise, you would need to specify how close you're interested in.