60.410. 1. For the purpose of the use of this system, Missouri is divided into three separate zones, to be officially known as "The East Zone", "The Central Zone", and "The West Zone".
2. The area now included in the following counties shall constitute the east zone: Bollinger, Butler, Cape Girardeau, Carter, Clark, Crawford, Dent, Dunklin, Franklin, Gasconade, Iron, Jefferson, Lewis, Lincoln, Madison, Marion, Mississippi, Montgomery, New Madrid, Oregon, Pemiscot, Perry, Pike, Ralls, Reynolds, Ripley, St. Charles, Ste. Genevieve, St. Francois, St. Louis, St. Louis (city), Scott, Shannon, Stoddard, Warren, Washington and Wayne.
3. The area now included in the following counties shall constitute the central zone: Adair, Audrain, Benton, Boone, Callaway, Camden, Carroll, Chariton, Christian, Cole, Cooper, Dallas, Douglas, Greene, Grundy, Hickory, Howard, Howell, Knox, Laclede, Linn, Livingston, Macon, Maries, Mercer, Miller, Moniteau, Monroe, Morgan, Osage, Ozark, Pettis, Phelps, Polk, Pulaski, Putnam, Randolph, Saline, Schuyler, Scotland, Shelby, Stone, Sullivan, Taney, Texas, Webster and Wright.
4. The area now included in the following counties shall constitute the west zone: Andrew, Atchison, Barry, Barton, Bates, Buchanan, Caldwell, Cass, Cedar, Clay, Clinton, Dade, Daviess, DeKalb, Gentry, Harrison, Henry, Holt, Jackson, Jasper, Johnson, Lafayette, Lawrence, McDonald, Newton, Nodaway, Platte, Ray, St. Clair, Vernon and Worth.
(L. 1965 p. 173 § 2)
Missouri General Assembly