What is the approximate longitude of the most westerly boundary of the United States?

Question

I know its around 168W longitude, and it's somewhere in Alaska, but I need to know the exact longitude of the most westerly boundary of the U.S.

Answer 1

Cape Prince of Wales, at 168°05′05″W, is the westernmost point on the mainland of the Americas.
Udall Point, Guam ( 13°26′51″N, 144°37′5.5″E) is the westernmost point in all of US territory.

Answer 2

From wikipedia:

* Udall Point, Guam ( [show location on an interactive map] 13°26′51″N, 144°37′5.5″E) — westernmost point in all of US territory
* Peaked Island, offshore from Cape Wrangell, Attu Island, Alaska (172°26'E) — westernmost point in the 50 states and last sunset in all of US territory
* Adak, Alaska — westernmost town in the 50 states[4]
* Amatignak Island, Alaska (179°6'W) — highest western longitude in all of US territory
* Cape Prince of Wales, Alaska (168°7'W) — westernmost point on the North American continent
* Bodelteh Islands offshore from Cape Alava, Washington (124°46'W) — westernmost point in the 48 contiguous states
* Cape Alava (during low tide) and tie between Cape Alava and Cape Flattery (during high tide) - westernmost point on the U.S. mainland (contigous)
* Ozette, Washington — westernmost town in the 48 contigous states

Answer 3

The furthest west would be the west end of the Aleutian at 172 EAST. The border is probably in the ocean at 170 East.

Answer 4

172.5

Attu Island