Who was Jefferson's vice president?
http://millercenter.virginia.edu/academic/americanpresident/jefferson
Thomas Jefferson served as the third President of the United States from 1801 to 1809. During his presidency, his vice president was Aaron Burr from 1801 to 1805, and then later George Clinton from 1805 until Jefferson's second term ended in 1809.
To find this information, you could search for "Thomas Jefferson's vice president" using a search engine like Google. The first result will likely provide you with the answer. You can also visit authoritative websites like the Miller Center at the University of Virginia, which has a comprehensive collection of resources on American presidents. By navigating to the page dedicated to Thomas Jefferson on that site, you can find information about his vice presidents.