According to the Canada 2001 Census, 250,005 Canadians reported American as being their ethnicity, at least partially. The Canada 2001 Census was a detailed enumeration of the Canadian population
There are also between 900,000 and 2 million Americans living in Canada.
Americans have fled to Canada throughout history. During the American Revolution, many Americans loyal to the British crown left the United States and settled in Canada. In this article the inhabitants of the thirteen colonies that supported the American Revolution are primarily referred to as "Americans" with occasional references to "Patriots" These early settlers are called United Empire Loyalists. The name United Empire Loyalists is a honorific name which has been given after the fact to those American Loyalists who resettled in British North America and other Similar waves of American immigration occurred during the War of 1812. The War of 1812 was fought between the United States of America and the British Empire, particularly Great Britain and her North American colonies Many Black Canadians are descendants of African American slaves (Black Loyalist) who fled to Canada during the American Revolution. Black Canadians', Caribbean Canadians, and African Canadians are designations used for people of Black African descent who reside in African Americans or Black Americans are citizens or residents of the United States who have origins in any of the black populations of Africa A Black Loyalist or African American Loyalist was a formerly enslaved African American or Free Negro who escaped to the British during the In this article the inhabitants of the thirteen colonies that supported the American Revolution are primarily referred to as "Americans" with occasional references to "Patriots" The Black Refugees in the War of 1812 also fled to Canada and many American slaves also came to via the Underground Railroad. The Black Refugees from the War of 1812 were African American slaves who fought for the British and were relocated to Nova Scotia The War of 1812 was fought between the United States of America and the British Empire, particularly Great Britain and her North American colonies The United States of America —commonly referred to as the The Underground Railroad was an informal network of secret routes and Safe houses used by 19th century Black slaves in the United States A more recent example of American immigration to Canada was during the Vietnam War era, where many American draft dodgers fled to Canada to avoid the war. The Vietnam War, also known as the Second Indochina War, or the Vietnam Conflict, occurred in Vietnam, Laos and Cambodia A draft dodger, draft evader or draft resister, is a person who avoids ("dodges" or otherwise violates the Conscription policies of the
In 2006 a record 10,200 Americans moved to Canada, the highest since 1977. 
For a list of notable Canadians of American descent see Category:Canadians of American descent. For notable American expats see Category:American expatriates in Canada.