The Air Force said using existing bomber bases would reduce operational impact, lower overhead, and minimize costs.
"Our current bomber bases are best suited for the B-21," Air Force Secretary Heather Wilson said in a release. Sen. Mike Rounds of South Dakota has said Ellsworth is a candidate to be the first to get the new, next-generation bomber.
Barksdale Air Force Base in Louisiana and Minot Air Force Base in North Dakota will continue to host the B-52 Stratofortress, the workhorse bomber that was first introduced in 1952 and is expected to remain in service until the 2050s.
A final basing decision is expected in 2019 after compliance with the National Environmental Policy Act and other regulations.
"We are designing the B-21 Raider to replace our aging bombers as a long-range, highly survivable aircraft capable of carrying mixed conventional and nuclear payloads, to strike any target worldwide," Air Force chief of staff Gen. David L. Goldfein said in the release.
Air Force Brig. Gen. Carl Schaefer, commander of the 412th Test Wing, said in March that the B-21 will head to Edwards Air Force Base in California for testing "in the near future." His announcement appeared to confirm that the Raider would undergo operational testing sooner than expected.
The B-21 is being engineered to have next-generation stealth capability to allow it to elude the most advanced air defenses in the world, and it has been developed under a high level of secrecy.
There are no known photographs of the bomber, and few details about it have been released. A report in November suggested the Air Force could have been preparing Area 51 to host the bomber for testing.
The name "Raider" was selected from suggestions submitted by airmen in a contest in early 2016. The name refers to the daring Doolittle raid over Tokyo on April 18, 1942.
The raid was the first US strike on Japan in World War II, and it boosted morale in the US and led the Japanese military to divert resources for defense of its homeland. Lt. Col. Richard Cole, who was Lt. Col. James Doolittle's copilot and the last surviving member of the raid, announced the new name in September 2016.
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