Missouri has 114 counties plus 1 city independent of any county and 9 congressional districts: 111 counties are wholly within a given congressional district while 3 counties plus the independent City of St. Louis are divided among more than one congressional district.

UNDIVIDED COUNTIES (wholly within one Congressional District):

• CD # 3: Jefferson and Ste. Genevieve
• CD # 4: Bates, Benton, Camden, Cass, Cole, Dallas, Henry, Hickory, Johnson, Laclede, Lafayette, Maries, Miller, Moniteau, Morgan, Osage, Pettis, Pulaski, St. Clair, Saline, Vernon and Webster
• CD # 6: Andrew, Atchison, Buchanan, Caldwell, Carroll, Charlton, Clay, Clinton, Cooper, Daviess, DeKalb, Gentry, Grundy, Harrison, Holt, Howard, Linn, Livingston, Mercer, Nodaway, Platte, Putnam, Ray, Schuyler, Sullivan and Worth
• CD # 7: Barry, Barton, Cedar, Christian, Dade, Douglas, Greene, Jasper, Lawrence, McDonald, Newton, Ozark, Polk, Stone and Taney
• CD # 8: Bollinger, Butler, Cape Girardeau, Carter, Crawford, Dent, Dunklin, Howell, Iron, Madison, Mississippi, New Madrid, Oregon, Pemiscot, Perry, Phelps, Reynolds, Ripley, St. Francois, Scott, Shannon, Stoddard, Texas, Washington, Wayne and Wright
• CD # 9: Adair, Audrain, Boone, Callaway, Clark, Franklin, Gasconade, Knox, Lewis, Lincoln, Macon, Marion, Monroe, Montgomery, Pike, Ralls, Randolph, Scotland, Shelby and Warren

DIVIDED COUNTIES (split between more than one Congressional District):

• Jackson: CDs 4, 5 and 6
• St. Charles: CDs 2 and 9
• St. Louis County: CDs 1, 2 and 3

independent City of St. Louis: CDs 1 and 3
[NOTE: the City of St. Louis is completely independent of St. Louis County which surrounds it.]

CD # 5 is wholly within Jackson County