Keeping up with elections can be a daunting task with the different term lengths for local, state and federal offices. Understanding the rotation for the U.S. House of Representatives and the U.S. Senate takes some of the confusion from the equation, and it's relatively easy to remember.

How Long and When

Congressional elections roll around every two years. All of the U.S. House of Representative positions are on the ballot each time, as the members of this legislative body serve an unlimited number of two-year terms. One-third of U.S. Senators face elections each time, as senators serve six years in each term, unless they fill a position vacated by the death or resignation of a legislator. Congressional elections that fall two years into a president's term of office are nicknamed "midterm elections."