1906-1920 - Cincinnati & Columbus Traction Co.
Interurban line:
Cincinnati-Hillsboro (completed 1906)
Abandoned 1920
1902-1928 - Cincinnati Georgetown & Portsmouth Railroad Co.
1928-1936 - Cincinnati Georgetown Railroad Co.
Interurban lines:
Cincinnati-Georgetown (electrified 1902, discontinued 1936)
Georgetown-Russellville (constructed 1904, discontinued 1933)
Lake Allyn-Batavia (constructed 1902, discontinued 1936)
1900-1928 - Cincinnati Lawrenceburg & Aurora Electric Street Railroad Co.
1928-1930 - Cincinnati Lawrenceburg & Aurora Electric Railway Co.
Interurban lines:
Cincinnati-Aurora/Harrison (completed 1900)
Abandoned 1930
1903-1918 - Cincinnati Milford & Loveland Traction Co.
1918-1926 - Cincinnati Milford & Blanchester Traction Co.
Interurban line:
Cincinnati-Blanchester (completed 1906)
Abandoned 1926
1902-1923 - Interurban Railway & Terminal Co.
Interurban lines:
Cincinnati-New Richmond (constructed 1902, discontinued 1923)
Cincinnati-Bethel (constructed 1903, discontinued 1918)
Cincinnati-Lebanon (constructed 1903, discontinued 1923)
1904-1919 - Lebanon & Franklin Traction Co.
Interurban line:
Lebanon-Franklin (completed 1904)
Abandoned 1919
1897-1898 - Cincinnati Hamilton Middletown & Dayton Street Railroad Co.
1898-1902 - Mill Creek Valley Street Railroad Co.
1902-1905 - Cincinnati Interurban Co.
1905-1926 - Ohio Traction Co.
Interurban line:
Cincinnati-Hamilton (completed 1901)
Abandoned 1926
Some segments of these interurban railways, closer to Cincinnati, evolved to bus routes still operating in Cincinnati.