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Madison Telephone companies
This information is taken from Madison city directories.
| Year | Company | Office location |
|---|---|---|
| 1887 | Union Telephone Company | 110 East Main Street |
| 1890 | Central Union Telephone Company | 110 East Main Street |
| 1903 | Madison Telephone Company | 117 East Main Street |
| 1907 | Madison Telephone Company | 117 East Main Street |
| 1909 | Madison Telephone Company | 112-114 East Third Street |
| 1912 | Madison Telephone Company | 112 East Third Street |
| 1914 | Madison Telephone Company | 112 East Third Street |
| 1923 | Madison Telephone Company | 112 East Third Street |
| 1925 | Madison Telephone Company | 112 East Third Street |
| 1927 | Madison Telephone Company | 112 East Third Street |
| 1936 | Indiana Telephone Corporation | East Third Street |
| 1939 | Indiana Telephone Corporation | 112 East Third Street |
| 1942 | Indiana Telephone Corporation | 112 East Third Street |
| 1947 | Indiana Telephone Corporation | 112 East Third Street |
| 1954 | Indiana Telephone Corporation | 112 East Third Street |
| 1961 | Indiana Telephone Corporation | 419 Mulberry Street |
In 1978 Indiana Telephone sold out to the Continental Telephone Corporation. Offices remained at the 419 Mulberry Street address.
In 1992 GTE bought the Contel Company.
In 2000 Bell Atlantic purchased GTE and renamed the merged company Verizon.