Yes, there are three:
Given grants, US scientists are free to study at any location supported by any research station on the continent. This privilege is given to any scientist from any nation that is a signatory or has ratified the Antarctic Treaty. The United States supports three permanent stations on Antarctica: Amundsen-Scott South Pole Research Station, McMurdo Research Station and Palmer Station on the Antarctic Peninsula. In summer, several temporary research stations are supported from each of these permanent locations.
The US has McMurdo, Amundsen-Scott and Palmer stations on Antarctica
Three research stations are funded and supported by the US government. They are Palmer Station, Amundsen-Scott South Pole Station and McMurdo Station.
There are permanent, semi-permanent and temporary research stations on Antarctica. The number of permanent stations exceeds 40, on a continent that covers 10% of the surface of Earth. From the permanent stations, seasonal/ semi-permanent and temporary research stations are established as needed.
The United States of America supports three research stations on the Antarctic continent: McMurdo Station, Amundsen-Scott South Pole Station, and Palmer Station.
The United States supports research on Antarctica to address questions about the health of planet earth. This is the charter of every nation that supports scientific research south of 60 degrees S, which includes Antarctica.
For example, McMurdo Station in Antarctica, which is run by the National Science Foundation and supported by the US Military, has a military designated zip code, which changes annually. All NSF stations research stations there supported by the government of the United States have their own, annually-designated postal assignments. Technically, you are posting to a military base: APO-Army Post Office; AP-Armed Forces Pacific. Service is for any temporary scientist or worker in support of science, whether military or civilian. The mail transits through New Zealand where it is transferred to Antarctica via US Military C-17 transport/cargo planes. Other countries have their own mail and postal designations for their stations on the continent.
Most research stations are built near the coast, simply because of access. It's easier to transport supplies for building and maintaining the station from ships than it is from other modes of transport. The interior of Antarctica is home to several research stations. Vostok Station was built and is maintained by the Russian expeditions that drive over the ice from Mirny or Progress, both of which research stations are located on the coast. The South Pole Station, a US research station, is served by irregular air transport, based on the vagaries of weather in both the point of origin and at the pole.
Antarctica is protected by the Antarctic Treaty that, in fact, protects -- and governs -- all of earth south of 60 degrees S. The United States, like governments representing about 80% of the planet's population, supports a presence in Antarctica through work of its National Science Foundation. Three research stations are supported on the continent by USA, including Palmer Research Station, Amundsen-Scott South Pole Station, and McMurdo Research Station.
Your question may assume that there are countries established on the Antarctic continent -- which is an incorrect assumption. Research stations are established in Antarctica by countries interested in learning more about the health of planet earth. Under the Antarctic Treaty, Antarctica belongs to no one, and thus, essentially belongs to us all. All research performed on the continent is shared among all the nations that signed the Treaty.
Scientific research in the Antarctic brings us news about the health of planet earth.
You can find:Amundsen-Scott South Pole Station at 90 degrees S.McMurdo Station at 77°50′43.4″S, 166°40′11.2″E.Palmer Station at 64°46′27.1″S 64°03′11″W.