601--Carol Stream, IL
602--Evanston, IL
603--Oak Park, IL
604--Chicago, IL (SW)
605--Fox Valley, IL
606--Chicago, IL (Main/1)
607--Chicago, IL (Main/2)
608--Chicago, IL (Main/3)
609--Kankakee, IL
610--Rockford, IL (Vicinity)
611--Rockford, IL (Main)
612--Rock Island, IL
613--La Salle, IL
614--Galesburg, IL
615--Peoria, IL (Vicinity)
616--Peoria, IL (Main)
617--Bloomington, IL
618--Champaign, IL (North)
619--Champaign, IL (South)
620--St. Louis, MO (NE)/IL Suburbs
621--N/A
622--St. Louis, MO (SE)/IL Suburbs
623--Quincy, IL
624--Effingham, IL
625--Springfield, IL (East)
626--Springfield, IL (West)
627--Springfield, IL (Main)
628--Centralia, IL
629--Carbondale, IL
630--St. Louis, MO (SW)
631--St. Louis, MO (Main)
632--N/A
633--St. Louis, MO (and St. Charles)
634--Quincy, IL/MO Suburbs (and Hannibal, MO)
635--Quincy, IL/MO Suburbs (and Kirksville, MO)
636--Cape Girardeau, MO (and Flat River)
637--Cape Girardeau, MO (Main)
638--Cape Girardeau, MO (and Sikeston)
639--Cape Girardeau, MO (and Poplar Bluff)
640--Kansas City, MO (Vicinity)
641--Kansas City, MO (Main)
642--N/A
643--N/A
644--St. Joseph, MO (Vicinity)
645--St. Joseph, MO (Main)
646--Chillicothe, MO
647--Harrisonville, MO
648--Springfield, MO (and Joplin)
649--Kansas City, MO (IRS)
650--Columbia, MO (and Jefferson City area)
651--Columbia, MO (and City of Jefferson City)
652--Columbia, MO (Main)
653--Columbia, MO (and Sedalia)
654--Springfield, MO (and Rolla: A-I)
655--Springfield, MO (and Rolla: J-Z)
656--Springfield, MO (A-L)
657--Springfield, MO (M-Z)
658--Springfield, MO (Main)
659--N/A
660--Kansas City, KS (West)
661--Kansas City, KS (Main)
662--Shawnee Mission, KS
663--N/A
664--Topeka, KS (A-L)
665--Topeka, KS (M-Z)
666--Topeka, KS (Main)
667--Fort Scott, KS
668--Topeka, KS (SW)
669--Salina, KS (North)
670--Wichita, KS (A-L)
671--Wichita, KS (M-Z)
672--Wichita, KS (Main)
673--Independence, KS
674--Salina, KS (South)
675--Hutchinson, KS
676--Hays, KS
677--Colby, KS
678--Dodge City, KS
679--Liberal, KS
680--Omaha, NE (West)
681--Omaha, NE (Main)
682--N/A
683--Lincoln, NE (A-L)
684--Lincoln, NE (M-Z)
685--Lincoln, NE (Main)
686--Norfolk, NE (and Columbus)
687--Norfolk, NE (Main)
688--Grand Island, NE (Main)
689--Grand Island, NE (and Hastings)
690--McCook, NE
691--North Platte, NE
692--Valentine, NE
693--Alliance, NE
694--N/A
695--N/A
696--N/A
697--N/A
698--N/A
699--N/A