List of extreme points of the United States

There are a number of different interpretations for "easternmost" and "westernmost"; see below for full treatment.

This is a list of the extreme points of the United States, the points that are farther north, south, east, or west than any other location in the country. Also included are extreme points in elevation, extreme distances, and other points of peculiar geographic interest.

Extreme points in the 50 states: Point Barrow, Ka Lae, Sail Rock, Peaked Island
Extreme points in the contiguous 48 states: Northwest Angle, Ballast Key, Sail Rock, Bodelteh Islands
Extreme points of the U.S. on the North American continent: Point Barrow, Cape Sable, West Quoddy Head, Cape Prince of Wales
Extreme points in all U.S. territory: Point Barrow, Rose Atoll, Wake Island, Peaked Island (red dots); Point Udall, Guam, and Point Udall, USVI are shown as green dots. The International Date Line is shown in yellow.

Northernmost points

Southernmost points

Easternmost points

Westernmost points

Interpretation of easternmost and westernmost

There are three methods for reckoning the eastern and western extremes of the United States.

One method is to use the Prime Meridian as the dividing line between east and west. This meridian running through Greenwich, London, is defined as zero degrees longitude and could be called the least eastern and least western place in the world. The 180th meridian, on the opposite side of the globe, is therefore the easternmost and westernmost place in the world.

Another method is to use the International Date Line as the easternmost–westernmost extreme. On the equinox, the easternmost place would be where the day first begins, and the westernmost is where the day last ends.

Still another method is to first determine the geographic center of the country and from there measure the shortest distance to every other point. All U.S. territory is spread across less than 180° of longitude, so from any spot in the U.S. it is more direct to reach Point Udall, U.S. Virgin Islands, by traveling east than by traveling west. Likewise, there is not a single point in U.S. territory from which heading east is a shorter route to Point Udall, Guam, than heading west would be, even accounting for circumpolar routes. The two Udalls for whom the two Points are named were brothers, Mo Udall in Guam and Stewart Udall in the Virgin Islands.[4]

Highest points

Lowest points

Other points




Extremes in distance

Note that some map projections make diagonal lines appear longer than they actually are. However, the diagonal line from Kure Atoll, Hawaii to West Quoddy Head, Maine is only 5,797 miles (9,329 km) and the diagonal from Cape Wrangell, Attu Island, Alaska to Log Point on Elliott Key, Florida is only 5,505 miles (8,859 km).

See also


  1. The summit of Mount Whitney is the highest point of the Sierra Nevada, the State of California, and the contiguous United States.
  2. The summit of Mount Elbert is the highest point of the Front Range and the Continental Divide of North America.
  3. The summit of Mauna Kea is the highest point of the Island of Hawaiʻi, the State of Hawaiʻi, and the entire Pacific Ocean. Mauna Kea is also the tallest mountain on Earth as measured from base to summit. The shield volcano sits on the ocean floor at a depth of 19,678 feet (5,998 m) for a total height of 33,474 feet (10,203 m).


  1. International Boundary Commission
  3. The Milepost 61st edition pg. 626 ISBN 978-1892-15426-2
  4. Donald Winslow Carson; James W. Johnson (2001). Life and times of Morris K. Udall. University of Arizona Press. p. 220. ISBN 0-8165-2049-6.
  5. Mark Newell; Blaine Horner (September 2, 2015). "New Elevation for Nation's Highest Peak" (Press release). USGS. Retrieved September 26, 2015.
  6. "Mount Whitney". NGS Station Datasheet. United States National Geodetic Survey. Retrieved September 9, 2012.
  7. "Mount Whitney". Summits of the World. Retrieved September 9, 2012.
  8. The summit elevation of Mount Whitney includes an adjustment of +1.869 m (+6.1 ft) from NGVD 29 to NAVD 88.
  9. "Mount Elbert". NGS Station Datasheet. United States National Geodetic Survey. Retrieved June 21, 2016.
  10. "Mount Elbert". Summits of the World. Retrieved June 21, 2016.
  11. "Mauna Kea". Summits of the World. Retrieved April 1, 2012.
  12. "About Taos Ski Valley". Taos Ski Valley Chamber of Commerce. Retrieved February 29, 2012.
  13. "USGS National Elevation Dataset (NED) 1 meter Downloadable Data Collection from The National Map 3D Elevation Program (3DEP) - National Geospatial Data Asset (NGDA) National Elevation Data Set (NED)". United States Geological Survey. September 21, 2015. Retrieved September 22, 2015.
  14. Furnace Creek, in Death Valley, California, set the world record for the highest reliably reported ambient air temperature of 134 °F (57 °C) on July 10, 1913. This record has been eclipsed only once by a questionable reading of 136 °F (58 °C) recorded in 'Aziziya, Libya, on September 13, 1922.
  15. Sounding at 46° 54' 31"N, 86° 35' 52"W on NOAA chart 14963, Grand Marais to Big Bay Point, scale 1:120,000, 2006. Chart datum (as shown on the chart) is 601.1 feet above mean sea level at Rimouski, Quebec
  16. Two identical soundings at 47° 45.2'N, 122° 26.0'W and 47° 44.6'N, 122° 25.4'W on NOAA chart 18446, Puget Sound: Apple Cove Point to Keyport, scale 1:25,000, 2005. Chart datum (as shown on the chart) is lower low water.
  17. "Baker Island". Geographic Names Information System. United States Geological Survey. Retrieved February 24, 2009.
  18. "State University Encyclopedia: Equator". State University Encyclopedia. Retrieved July 3, 2009.
  19. "CIA World Factbook: Jarvis Island". CIA World Factbook. Retrieved July 3, 2009.
  21. 2009 Crater Lake National Park map
  23. 1 2 3 4 5
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