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166 zip codes in the 423 area code
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Cities and zips in BLEDSOE County:
PIKEVILLE: 37367

Cities and zips in BRADLEY County:
CHARLESTON: 37310
CLEVELAND: 37311 37364 37323 37320 37312
MC DONALD: 37353

Cities and zips in CAMPBELL County:
CARYVILLE: 37714
DUFF: 37729
JACKSBORO: 37757
JELLICO: 37762
LA FOLLETTE: 37766
NEWCOMB: 37819
PIONEER: 37847

Cities and zips in CARTER County:
ELIZABETHTON: 37643 37644
HAMPTON: 37658
MILLIGAN COLLEGE: 37682
ROAN MOUNTAIN: 37687
WATAUGA: 37694

Cities and zips in CLAIBORNE County:
ARTHUR: 37707
CLAIRFIELD: 37715
CUMBERLAND GAP: 37724
EAGAN: 37730
HARROGATE: 37752
LONE MOUNTAIN: 37773
NEW TAZEWELL: 37825 37824
PRUDEN: 37851
SHAWANEE: 37867
SPEEDWELL: 37870
TAZEWELL: 37879

Cities and zips in GREENE County:
AFTON: 37616
CHUCKEY: 37641
GREENEVILLE: 37744 37745 37743
MIDWAY: 37809
MOHAWK: 37810
MOSHEIM: 37818

Cities and zips in HAMILTON County:
APISON: 37302
BAKEWELL: 37304
BIRCHWOOD: 37308
CHATTANOOGA: 37409 37408 37410 37407 37411 37416 37412 37421 37414 37415 37419 37422 37424 37406 37405 37404 37403 37402 37401 37450
COLLEGEDALE: 37315
HARRISON: 37341
HIXSON: 37343
LOOKOUT MOUNTAIN: 37350
LUPTON CITY: 37351
OOLTEWAH: 37363
SALE CREEK: 37373
SIGNAL MOUNTAIN: 37377
SODDY DAISY: 37379 37384

Cities and zips in HANCOCK County:
KYLES FORD: 37765
SNEEDVILLE: 37869

Cities and zips in HAWKINS County:
BULLS GAP: 37711
CHURCH HILL: 37642
EIDSON: 37731
MOORESBURG: 37811
MOUNT CARMEL: 37645
ROGERSVILLE: 37857
SURGOINSVILLE: 37873

Cities and zips in JOHNSON County:
BUTLER: 37640
LAUREL BLOOMERY: 37680
MOUNTAIN CITY: 37683
SHADY VALLEY: 37688
TRADE: 37691

Cities and zips in LOUDON County:
PHILADELPHIA: 37846

Cities and zips in MARION County:
GUILD: 37340
JASPER: 37347
SEQUATCHIE: 37374
SOUTH PITTSBURG: 37380
WHITESIDE: 37396

Cities and zips in MCMINN County:
ATHENS: 37303 37371
CALHOUN: 37309
ENGLEWOOD: 37329
ETOWAH: 37331
NIOTA: 37826
RICEVILLE: 37370

Cities and zips in MEIGS County:
DECATUR: 37322
GEORGETOWN: 37336
TEN MILE: 37880

Cities and zips in MONROE County:
COKER CREEK: 37314
MADISONVILLE: 37354
TELLICO PLAINS: 37385
VONORE: 37885

Cities and zips in MORGAN County:
COALFIELD: 37719
DEER LODGE: 37726
LANCING: 37770
OAKDALE: 37829
PETROS: 37845
RUGBY: 37733
SUNBRIGHT: 37872
WARTBURG: 37887

Cities and zips in POLK County:
BENTON: 37307
CONASAUGA: 37316
COPPERHILL: 37317
DELANO: 37325
DUCKTOWN: 37326
FARNER: 37333
OCOEE: 37361
OLD FORT: 37362
RELIANCE: 37369
TURTLETOWN: 37391

Cities and zips in RHEA County:
DAYTON: 37321
EVENSVILLE: 37332
GRANDVIEW: 37337
GRAYSVILLE: 37338
SPRING CITY: 37381

Cities and zips in SCOTT County:
ELGIN: 37732
HELENWOOD: 37755
HUNTSVILLE: 37756
ONEIDA: 37841
ROBBINS: 37852
WINFIELD: 37892

Cities and zips in SEQUATCHIE County:
DUNLAP: 37327
WHITWELL: 37397

Cities and zips in SULLIVAN County:
BLOUNTVILLE: 37617
BLUFF CITY: 37618
BRISTOL: 37621 37620 37625
KINGSPORT: 37662 37663 37660 37664 37665 37669
PINEY FLATS: 37699 37686

Cities and zips in UNICOI County:
ERWIN: 37650
FLAG POND: 37657
UNICOI: 37692

Cities and zips in WASHINGTON County:
FALL BRANCH: 37656
JOHNSON CITY: 37601 37604 37615 37614 37605 37602
JONESBOROUGH: 37659
LIMESTONE: 37681
MOUNTAIN HOME: 37684
TELFORD: 37690

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