North America

North America was a continent on the planet Earth, located above Central and South America. It was inhabited by the Native Americans. (TV: "The Sea of Death") The Americas were separated from Europe and Africa to the east by the Atlantic Ocean. (TV: War of the Sontarans) Several UNIT bases were established in North America by the 21st century. (TV: The Stolen Earth)

Geography
North America included the bordering nations of America (TV: Dalek, Revenge of the Slitheen) and Mexico. (TV: The Zygon Invasion) The Bering Strait ran between East Russia and Alaska, (PROSE: Doctor Who: The Encyclopedia) the latter of which was called the "stepping stone between America and Asia" by the Fifth Doctor. (AUDIO: The Land of the Dead)

21st century
In the 2000s, transducers used by the Slitheen briefly caused a massive power loss stretching westwards from the West Coast of North America, including Los Angeles. (TV: Revenge of the Slitheen)

By the 2000s, North America was part of the worldwide nuclear grid overseen by UNIT. (TV: The Poison Sky)

In the 2010s, the Mexico border was among the places where newly-hatched Zygons were settled across Earth as part of Operation Double, resulting in a minority of Zygons residing in New Mexico, USA under the pretence of being British migrants. (TV: The Zygon Invasion)

The North American blizzard occurred in March 2017. (PROSE: Time Lapse)

22nd century
In the 2190s, the Daleks dug up most of North America to build a mineshaft through which they could place a propulsion unit at the planet's core. (AUDIO: Lucie Miller, To the Death)

Parallel universe
In Roma I, Marcus Americanius Scriptor's family ruled Northern America from their family home since Marcus' great-great-grandfather Americanus was sent to quell a republican revolution 140 years before Marcus' birth. When Marcus was ten years old, he wrote a three-volume history of America and its people. 100 million people lived in America at this time. (PROSE: Warlords of Utopia)

Other references
While undercover at the Pharm, "Samantha Jones" claimed North America among the places she had visited. (TV: Reset)