U.S. Reps. Dennis Moore and Jerry Moran have guaranteed their spots on the ballot as they run for re-election this year.
Both filed for office this week by paying a $1,672 fee with the Kansas secretary of state's office.
Moore, a Democrat, represents the 3rd District, which covers part of Lawrence and the state's portion of the Kansas City metropolitan area. He was first elected in 1998.
Moran, a Republican, is seeking another term in the 1st District of western Kansas. He was first elected in 1996.
Rep. Todd Tiahrt, a Republican who represents the 4th District of south-central Kansas, filed for re-election in March.
Rep. Nancy Boyda, a Democrat who represents the 2nd District of eastern Kansas, has submitted petitions. But the secretary of state's office is still validating signatures on those petitions.