Wisconsin's 1st CD is made up of six southeastern Wisconsin counties: Kenosha, Milwaukee, Racine, Rock, Walworth, and Waukesha. Major municipalities in the 1st CD include Burlington, Elkhorn, Kenosha, Lake Geneva, Oak Creek, Racine, Janesville, and South Milwaukee.

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Each county in the 1st CD has a Democratic Party chapter - by joining one (linked above), you are automatically a member of the 1st CD Democrats AND the Democratic Party of Wisconsin. ​