Thomas Jefferson and five other US Presidents were elected after serving as Vice Presidents:
1. Thomas Jefferson (1801-1809) served as Vice President under John Adams before being elected as President in 1800.
2. Martin Van Buren (1837-1841) served as Vice President under Andrew Jackson before being elected as President in 1836.
3. John Tyler (1841-1845) served as Vice President under William Henry Harrison before becoming President upon Harrison's death.
4. Millard Fillmore (1850-1853) served as Vice President under Zachary Taylor before becoming President upon Taylor's death.
5. Andrew Johnson (1865-1869) served as Vice President under Abraham Lincoln before becoming President upon Lincoln's assassination.
6. Chester A. Arthur (1881-1885) served as Vice President under James A. Garfield before becoming President upon Garfield's assassination.
These Presidents all served as Vice Presidents before being elected to the presidency, either through the death of the incumbent President or through election as President in their own right.