Bartlett, who was first elected to Congress in 1992, filed with the state election board after holding his annual meeting with state lawmakers from his congressional district to discuss matters of mutual concern.
Only one other person, Jefferson, Md., resident Tim D. McCown, has announced his candidacy for Bartlett's 6th District seat. McCown, a Democrat, is seeking his first elective office.
McCown said he will avoid taking campaign contributions from political action committees, limiting himself to individual donations.
With the upcoming campaign in mind, Bartlett said he will continue to promote campaign finance reform, including his plan to require that 75 percent of all money raised come from within the congressional district.
"We run too long, we spend too much money," said Bartlett, who spent about $250,000 in his last campaign.
Bartlett said true campaign finance reform is likely to take place only if a bipartisan commission studies the matter and issues recommendations.
"If it's a good (law), then we'll be shamed into voting for it," he said.
Bartlett's district includes all of Western Maryland, as well as Frederick and Carroll counties and much of Howard County.
Members of the House of Representatives make $136,673 a year. The primary election this year is Sept. 15. The general election is Nov. 3.