| Numerical prefix | Recommended central office names (1955) |
|---|---|
| 22x | ACademy, BAldwin, CAnal, CApital, CAstle |
| 23x | ADams, BElmont, BEverly, CEdar, CEnter, CEntral |
| 24x | CHapel, CHerry, CHestnut, CHurchill, CIrcle |
| 25x | ALpine, BLackburn, CLearbrook, CLearwater, CLifford, CLinton |
| 26x | AMherst, ANdrew, COlfax, COlony, COngress |
| 27x | BRidge, BRoad(way), BRown(ing), CRestview, CRestwood |
| 28x | ATlantic, ATlas, ATwater, ATwood, AVenue, BUtler |
| 29x | AXminster, AXtel, CYpress |
| 32x | DAvenport, DAvis, EAst(gate), FAculty, FAirfax, FAirview |
| 33x | DEerfield, DEwey, EDgewater, EDgewood, EDison, FEderal |
| 34x | DIamond, DIckens, FIeldbrook, FIeldstone, FIllmore, FIrestone |
| 35x | ELgin, ELliot, ELmwood, FLanders, FLeetwood |
| 36x | EMerson, EMpire, ENdicott, FOrest, FOxcroft |
| 37x | DRake, DRexel, ESsex, FRanklin, FRontier |
| 38x | DUdley, DUnkirk, DUpont, EVergreen, FUlton |
| 39x | EXbrook, EXeter, EXport, EXpress |
| 42x | GArden, GArfield, HAmilton, HArrison, HAzel |
| 43x | GEneral, GEneva, HEmlock, HEmpstead, IDlewood |
| 44x | GIbson, GIlbert, HIckman, HIckory, HIllcrest, HIlltop |
| 45x | GLadstone, GLencourt, GLendale, GLenview, GLobe |
| 46x | HObart, HOmestead, HOpkins, HOward, INgersoll |
| 47x | GRanite, GReenfield, GReenleaf, GReenwood, GRidley, GRover |
| 48x | HUbbard, HUdson, HUnter, HUntley, HUxley, IVanhoe |
| 49x | GYpsy, HYacinth, HYatt |
| 52x | JAckson, LAfayette, LAkeside, LAkeview, LAmbert, LAwrence |
| 53x | JEfferson, KEllogg, KEystone, LEhigh, LEnox |
| 54x | KImball, KIngsdale, KIngswood, LIberty, LIncoln, LInden |
| 56x | JOhn, JOrdan, LOcust, LOgan, LOwell |
| 58x | JUniper, JUno, JUstice, LUdlow, LUther |
| 59x | LYceum, LYndhurst, LYnwood, LYric |
| 62x | MAdison, MAin, MArket, MAyfair, NAtional |
| 63x | MEdford, MElrose, MErcury, NEptune, NEwton, NEwtown |
| 64x | MIdway, MIlton, MIssion, MItchell, NIagara |
| 65x | OLdfield, OLive, OLiver, OLympia, OLympic |
| 66x | MOhawk, MOntrose, MOrris, NOrmandy, NOrth(field) |
| 67x | ORange, ORchard, ORiole, ORleans, OSborne |
| 68x | MUrdock, MUrray, MUseum, MUtual, OVerbrook, OVerland |
| 69x | MYrtle, OWen, OXbow, OXford |
| 72x | PAlace, PArk(view), PArk(way), RAndolph, RAymond, SAratoga |
| 73x | PErshing, REd(field), REd(wood), REgent, REpublic |
| 74x | PIlgrim, PIoneer, RIver(side), RIver(view), SHadyside, SHerwood |
| 75x | PLateau, PLaza, PLeasant, PLymouth, SKyline |
| 76x | POplar, POrter, ROckwell, ROger(s), SOuth(field) |
| 77x | PRescott, PResident, PRospect, SPring, SPruce |
| 78x | STate, STerling, STillwell, STory, SUffolk, SUnset, |
| 79x | PYramid, SWarthmore, SWift, SWinburne, SYcamore |
| 82x | TAlbot, TAlmadge, TAylor, VAlley, VAndyke |
| 83x | TEmple(ton), TEnnyson, TErminal, TErrace, VErnon |
| 84x | THornwell, TIlden, VIctor(ia), VIking, VInewood |
| 85x | ULrick, ULster, ULysses |
| 86x | TOwnsend, UNderhill, UNion, UNiversity, VOlunteer |
| 87x | TRemont, TRiangle, TRinity, TRojan, UPtown |
| 88x | TUcker, TUlip, TUrner, TUxedo |
| 89x | TWilight, TWinbrook, TWining, TWinoaks |
| 92x | WAbash, WAlker, WAlnut, WArwick, WAverly |
| 93x | WEbster, WEllington, WElls, WEst(more), YEllowstone |
| 94x | WHitehall, WHitney, WIlliam(s), WIlson, WIndsor |
| 96x | WOodland, WOodlawn, WOodward, WOrth, YOrktown |
| 98x | YUkon |
| 99x | WYandotte, WYman, WYndown |