Los Angeles Area Telephone Service Area Map
Blue areas are AT&T monopoly territory. Green areas are Verizon monopoly territory.
The first map is LA area. The second shows surrouding areas. A larger map may be found on the website of the California Public Utilities Commission at: ftp://ftp.cpuc.ca.gov/acmaps/2007_CPUC_map_46X54_2.pdf
Los Angeles telco service areas
Telco service areas in areas surrounding Los Angeles
Source: ftp://ftp.cpuc.ca.gov/acmaps/2007_CPUC_map_46X54_2.pdf