Agere Systems inherited the Allentown, Reading, and Orlando facilities. Reading is now closed, all production at Allentown has ceased and the production buildings have been demolished (some office buildings are still in use, however). Orlando was up for sale a couple of years ago, but I don't know the current status of production there.
Hawthorne, Kearny, and Baltimore are long closed. Phoenix was sold to local management, who moved several cable lines from the Atlanta works to Phoenix. Teletype's plants in Skokie and Little Rock went to Avaya, but I'm not familiar with the current status of those plants, although last I heard Shreveport and Denver (also went to Avaya) were still in business.
I believe that the Northern Illinois works is closed and all switching manufacturing for Lucent domestically is in Dallas. Last I heard Merrimac Valley (Massachusetts) was still doing manufacturing, but at a reduced level. The North Carolina plants are all closed, AFAIK. Kansas City works has also closed.
Lucent is shadow of the former Western Electric and is doing more manufacturing overseas (after all, they are a global supplier now).
E. Tappert (former WECo employee)[TELECOM Digest Editor's Note: I am not certain, but I think in the case of Cicero, Illinois at that location now is a shopping mall/ condominium apartment complex called 'Hawthorne Place'. PAT]