← Who holds officeIowaChuck GrassleyU.S. Senator from IowaRepublicanPartyRepublicanOfficeU.S. Senator from IowaIn this chamber since1981Current term endsJanuary 2029Official websitegrassley.senate.govPhone202-224-3744Washington office135 Hart Senate Office Building Washington DC 20510Official portrait: U.S. Government Publishing Office, public domain. Service record: the public congress-legislators dataset.