1998 United States Senate election in Idaho

1998 United States Senate election in Idaho
	County results; Crapo: 40–50% 50–60% 60–70% 70–80% 80–90% >90%
U.S. senator before election; Dirk Kempthorne; Republican	Elected U.S. Senator ; Mike Crapo; Republican

The 1998 United States Senate election in Idaho was held November 3, 1998 alongside other elections to the United States Senate in other states as well as elections to the United States House of Representatives and various state and local elections. Incumbent Republican U.S. Senator Dirk Kempthorne decided to retire after one term to run for governor. Republican nominee Mike Crapo won the open seat.

Democratic primary

Democratic primary results^[1]
Party		Candidate	Votes	%
	Democratic	Bill Mauk	22,503	100.00%
Total votes			22,503	100.00%

Republican primary results^[2]
Party		Candidate	Votes	%
	Republican	Mike Crapo	110,205	87.27%
	Republican	Matt Lambert	16,075	12.73%
Total votes			126,280	100.00%

General election results^[3]
Party		Candidate	Votes	%	±%
	Republican	Mike Crapo	262,966	69.54%	+13.01%
	Democratic	Bill Mauk	107,375	28.39%	-15.08%
	Natural Law	George J. Mansfeld	7,833	2.07%	+2.07%
Majority			155,591	41.14%	+28.10%
Turnout			378,174		-20.97%
	Republican hold

^ "98 Primary - Senate". Archived from the original on September 30, 2011. Retrieved April 24, 2011.
^ "98 Primary - Senate". Archived from the original on September 30, 2011. Retrieved April 24, 2011.
^ "Office of the Clerk, U.S. House of Representatives".