The unofficial tandem list of the MCI network (now part of Verizon Business)
The following is a list of MCI tandems circa 2000. This list was provided by the late telephone researcher Mark Cuccia (1961-2014). This is a list of native MCI tandems that does not include Worldcom or any other systems, as they were pretty much kept as separate entities, even in 2023. This is not assumed to be an all inclusive list, and nowhere near correct. If you know of any corrections, please contact us and we will work on getting this fixed. Thanks!
ID SWITCH REGION 211 PRY2 MID ATL 212 CHT1 NOR EAST 213 WPL2 White Plains NY NOR EAST 215 BRW2 Bridgewater MA MID WEST? 216 WRG4 West Orange NJ MID ATL 21A AUB2 ?Auburn AL? KY? SO EAST 21B DNJ1 Denver CO WEST 21C SAJ3 San Antonio TX SO WEST 21E BRK1 ?Brownsville TX? SO WEST 21F GRN2 Greensboro NC SO EAST 21G CHT2 NOR EAST 21H RIA1 Rialto CA PACIFIC 21K CRJ1 Corpus Christi TX SO WEST 21L DNJ2 Denver CO WEST 21M SEJ5 Seattle WA WEST - ? US/Canada gateway ? 21N LUB2 ?Lubbock TX? SO WEST 21Y POT2 Pottstown PA MID ATL 23E SCR2 Sacramento CA PACIFIC 23I MEM2 Memphis TN SO EAST 23J WYV2 MID WEST 23K IRV3 ?Irving TX? SO WEST 23N POT1 Pottstown PA MID ATL 23T HLB2 NOR EAST 25I OMJ2 Omaha NE WEST 2AK DMG1 PACIFIC 2AL SFC3 San Francisco CA PACIFIC 2AM SHO1 Sherman Oaks CA PACIFIC 2AP JKV1 Jacksonville FL SO EAST 2AZ HOU6 Houston TX SO WEST 2BE DNG2 MID WEST 2BF IPL2 Indianapolis IN MID WEST 2BG PIT4 Pittsburgh PA MID ATL 2BJ IRV2 ?Irving TX? SO WEST 2BK NYCD New York City NY NOR EAST 2BL NEO1 New Orleans LA SO EAST 2BM WRG2 West Orange NJ MID ATL 2BP AST2 Austell GA SO EAST 2BR GRN1 Greensboro NC SO EAST 2BZ NYCE New York City NY NOR EAST 2CB HAY1 Hayward CA PACIFIC 2CD BRW1 Bridgewater NJ MID WEST? 2CE DMG2 PACIFIC 2CG WAS6 Washington DC MID ATL 2CH PHL6 Philadelphia PA MID ATL 2CJ WIT1 (several possible AZ) WEST 2CK NRL1 MID WEST - US/Canada gateway 2CL DAL9 Dallas TX SO WEST 2CQ PRY1 Perryman, MD MID ATL 2CS WSP1 MID WEST 2CT WYV1 MID WEST 2CU WPL1 White Plains NY NOR EAST 2CV AUB1 ?Auburn AL? KY? SO EAST 2CX NBW1 ?New Brunswick NJ? MID ATL 2CY SRD1 ?Springfield MA? NOR EAST 2CZ IDC2 ?Independence MO? SO WEST 2D4 POB1 SO EAST 2DK MIM3 Miami FL SO EAST 2EA RIC2 Richmond VA MID ATL 2EB NRL2 MID WEST - US/Canada gateway 2ED MNJ1 Minneapolis MN WEST 2EE HOU5 Houston TX SO WEST 2EF PHI7 Philadelphia PA MID ATL 2EG OMJ1 Omaha NE WEST 2EH HAY2 Hayward CA PACIFIC 2EJ AST3 Austell GA SO EAST 2EK SEJ1 Seattle WA WEST - ? US/Canada gateway ? 2EL WSP2 ?Western Springs IL? MID WEST 2EO RIA2 Rialto CA PACIFIC 2HH IRV1 ?Irving TX? SO WEST 2II DNG1 MID WEST 2OP HLB3 NOR EAST 2QQ ATL2 Atlanta GA SO EAST 2RR AST1 Austell GA SO EAST 2XX WAS5 Washington DC MID ATL 2ZZ IDC1 ?Independence MO? SO WEST A07 DNJH Denver CO WEST A26 WAS7 Washington DC MID ATL AAD WIT6 (several possible AZ) WEST ACY MNJK Minneapolis MN WEST AGQ CHTG NOR EAST AGW RCH1 ?Richardson TX? SO WEST AHA HAYD Hayward CA PACIFIC AUL SAR1 PACIFIC AWT ATLC Atlanta GA SO EAST AYM PLV3 MID ATL AYU RIA6 NOR EAST ELB ELM1 NOR EAST