← Who holds officeWisconsinRon JohnsonU.S. Senator from WisconsinRepublicanPartyRepublicanOfficeU.S. Senator from WisconsinIn this chamber since2011Current term endsJanuary 2029Official websiteronjohnson.senate.govPhone202-224-5323Washington office328 Hart Senate Office Building Washington DC 20510Official portrait: U.S. Government Publishing Office, public domain. Service record: the public congress-legislators dataset.