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Iowa's 18th State Senate district
Senator	Janet Petersen D

The 18th District of the Iowa Senate is located in central Iowa, and is currently composed of part of Polk County.

Current elected officials

Janet Petersen is the senator currently representing the 18th District.

The area of the 18th District contains two Iowa House of Representatives districts:

• The 35th District (represented by Sean Bagniewski)
• The 36th District (represented by Austin Baeth)

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

List of representatives

Historical District Boundaries

Source:

Map	Description	Years Effective	Notes
	Cedar County Clinton 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.
	Adair County Cass County Madison County Warren County	1856-1859
	Marion County	1860-1863
	Mahaska County	1864-1877
	Adair County Cass County Madison County	1878-1883
	Adair County Adams County Cass County	1884-1887
	Cass County Shelby County	1888-1962
	Clinton County	1963-1966
	Iowa County Poweshiek County	1967-1970
	Grundy County Marshall County	1971-1972	In 1970, the Iowa Legislature passed an amendment to the Iowa Constitution setting forth the rules for legislative redistricting in order to abide by the rules established by the Reynolds v. Sims Supreme Court Case. The first reapportionment map created by the Republican controlled legislature was deemed Unconstitutional, but was still used for the 1970 Election.
	Black Hawk County (partial) Primarily composed of Cedar Falls	1973-1982
	Dubuque County (partial) Primarily composed of Dubuque	1983-2002	Some minor boundary changes may have occurred after the redistricting of 1992.
	Linn County (partial) Excluding Bertram Township College Township Marion Township (partial) Marion Township South of Marion and West of US-151 was not part of Senate District 18, the remainder was. Putnam Township Bertram Cedar Rapids Ely	2003-2012
	Polk County (partial) Webster Township (partial) Small Section between I-35/I-80, the Des Moines River and Des Moines Des Moines (partial) North Western Portions of the City	2013-2022
	Polk County (partial) Des Moines (partial) Western portions of the city	2023-Present

See also

• Iowa General Assembly
• Iowa Senate

References

1. "SENATE DISTRICT 18" (PDF). Iowa General Assembly. Retrieved March 28, 2024.
2. Agency, Iowa Legislative Services. "Iowa Legislature - Legislator List". Retrieved July 15, 2016.
3. "Iowa House Districts" (PDF). Iowa Legislative Services Agency. Retrieved July 15, 2016.
4. "Iowa Congressional Districts" (PDF). Iowa Legislative Services Agency. Retrieved July 15, 2016.
5. "Historic Legislator List SD 16".
6. "Dubuque Encyclopedia entry for Robert Carr".
7. Iowa Redbook for GA 74. Iowa State Government. p. 482.
8. "Iowa historic district map database".
9. "1846 Iowa Constitution" (PDF).
10. "Reapportionment in Iowa".

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