How many accidents per year occur in the U.S.?

About 28 million.

From 2004 to 2006, an average of 28,050,333 accidents per year is recorded in the United States. This is based on the Emergency Department Summaries of the National Hospital Ambulatory Medical Care Surveys by the US Department of Health and Human Services for 2004-2006. For all 3 years the top reported cause of accidents is from falls, followed by motor vehicle traffic accidents.