Iowa's 20th Senate district

The 20th District of the Iowa Senate is located in central Iowa, and is currently composed of part of Polk County.

Current elected officials

Mike Pike is the senator currently representing the 20th District.
The area of the 20th District contains two Iowa House of Representatives districts:

The district is also located in Iowa's 3rd congressional district, which is represented by Zach Nunn.

Map	Description	Years effective	Notes
	Boone County Bancroft County Calhoun County Cerro Gordo County Dallas County Emmet County Franklin County Greene County Guthrie County Hancock County Hamilton County Hardin County Humboldt County Jasper County Kossuth County Marshall County Palo Alto County Pocahontas County Polk County Story County Webster County Winnebago County Worth County Wright County	1852–1855	From 1846 to 1857, district numbering was not utilized by the Iowa State Legislature. This convention was added with the passing of the 1857 Iowa Constitution. Numbering of districts pre-1857 is done as a matter of historic convenience.
	Iowa County Johnson County	1856–1859
	Clinton County	1860–1863
	Warren County	1864–1877
	Muscatine County	1878–1887
	Louisa County Muscatine County	1888–1962
	Linn County	1963–1966
	Polk County	1967–1970
	Black Hawk County	1971–1972
	Grundy County Hardin County Jasper County Marshall County Story County	1973–1982
	Scott County	1983–1992
	Cedar County Clinton County Jones County Scott County	1993–2002
	Benton County Grundy County Iowa County Honey Creek Township Marengo Township Washington Township Marengo Tama County Excluding Columbia Township Richland Township Salt Creek Township Chelsea	2003–2012
	Polk County Jefferson Township Grimes Johnston Urbandale	2013–2022
	Polk County Altoona Des Moines *North East part of the city Pleasant Hill	2023–present	-