Note: Iowa's 3rd congressional district (that includes Dallas County, Iowa) is a congressional district in the U.S. state of Iowa that covers its southwestern quadrant, which roughly consists of an area stretching from Des Moines to the borders with Missouri.

Note: Iowa Senate District 23 in central Iowa is currently composed of part of Dallas and Polk counties.

Note: Iowa House District 23 represents Adair, Madison, SW Dallas, NE Union and W Clarke Counties.

Note: Iowa House District 27 is currently composed of part of Dallas County.

Note: Iowa House District 28 represents areas of Dallas County including southwestern West Des Moines, Adel and Van Meter.