The territorial jurisdiction of Iron Workers Local Union 577 which extends halfway to the nearest outside Local Union of the International Association of Bridge, Structural and Ornamental Ironworkers.
IOWA: Davis County, Des Moines County, Henry County, Jefferson County, Keokuk County, Lee County, Louisa County, Van Buren County, Wapello County, and Washington County.
MISSOURI: Adair County, Clark County, Knox County, Lewis County, Macon County, Marion County, Monroe County, Ralls County, Schuyler County, Scotland County, and Shelby County.
ILLINOIS: Adams County, Hancock County, Henderson County, West Portion of Knox County (West of Highway 41), McDonough County, Brown County, Warren County and Lock and Dam 17 in Mercer County