There are many Yellow Cab taxicab operators around the world (some with common heritage, some without). The original Yellow Cab Company, based in Chicago, Illinois is one of the largest taxicab companies in the United States.
In 1908, Albert Rockwell, (founder and General Manager of the New Departure Manufacturing Co. of Bristol, Connecticut) traveled to Europe to evaluate their taxi systems, hoping to develop a similar one in Washington, D.C. 'Wyckoff, Church and Partridge' had a number of orange-yellow colored Rockwell taxicabs operating on Manhattan streets in 1909. By March 1910, the Connecticut Cab Co. (essentially the directors of New Departure Manufacturing Co.) assumed operating control of Wyckoff, Church and Partridge's taxis.
The 'Yellow Taxicab Co.' was incorporated in New York on April 4, 1912. Its fares that year started at 50¢/mile (equivalent to $11.44 in 2011 adjusted for inflation). Among its directors and major stockholders were Albert F. Rockwell and the Connecticut Cab Co. Shortly after incorporation the Yellow Taxicab Co. merged with the Cab and Taxi Co., and with the strength of Connecticut Cab with whom its name was interchangeably used, the young business assumed a large share of the New York market. Its independent corporate life was fairly short, however, as fare wars and restrictions forced a merger with the Mason-Seaman Transportation Co. on March 3, 1914.
The Yellow Cab Company of Chicago (not to be confused the Yellow Taxicab Co.) was founded by John Hertz in 1914. Their specially designed taxicabs were powered by a 4-cylinder Continental engine equipped with a purpose-built taxicab body supplied by the Racine Body Co., of Racine, Wisconsin. According to Yellow Cab Co. tradition, the color (and name) yellow was selected by John Hertz as the result of a survey by the University of Chicago which indicated it was the easiest color to spot.
'Yellow cab' companies in the United States and in other countries
- The Yellow Cab Company of Baltimore, Maryland, was founded in 1909. (U.S.)
- The Yellow Cab Company of Vancouver, British Columbia was founded in 1921. (Canada)
- Yellow Cab of Victoria, British Columbia, formerly Empress Taxi. (Canada)
- Yellow Checker Cab of Peoria, Illinois, was founded in 1922 and is the largest taxi fleet in downstate Illinois. (U.S.)
- The 'Yellow Cab Group' in Australia was founded in 1924. (Australia)
- Yellow Cab Co. in Oklahoma City, Oklahoma was founded in 1918. It ultimately became the Yellow Roadway, a major U.S. truck operator (now YRC Worldwide). (U.S.)
- Yellow Cab of Edmonton, Alberta was purchased and given the Yellow name in 1945. (Canada)
- The Yellow Cab Cooperative of San Francisco, California, was founded on November 8, 1977, succeeding a failed private company. (U.S.)
- Yellow Cab of San Diego, California, has been in continuous operation since the 1920s. Yellow Cab of San Diego has since sold all of its vehicles; the company operates now as a radio system only. (U.S.)
- Yellow Cab Company of Toronto (U.S.)
- Yellow Cab Co of Bay Area (U.S.)
- Peter Pan Bus Lines was founded as Yellow Cab Air Line in Springfield, Massachusetts, which was purchased by Peter Carmen Picknelly in 1933. (U.S.)
- Louisville Transportation Company of Louisville, Kentucky, operates as Yellow Cab as well as Checker Cab and Cardinal Cab. Yellow Cab of Louisville has been in continuous operation since 1893, when it was founded as Louisville Carriage Company. (U.S.)
- NYC Cab  (U.S.)
- Yellow Cab Of Buffalo Is Part Of Liberty Cab
- NYC Cab in NJ. 
- The New York Times June 14, 1908
- "Yellow taxicab...". Coachbuilt.
- The New York Law Journal, March 10, 1910
- As calculated by the U.S. Bureau of Statistics' CPI Inflation Calculator; year selected is 1913, the closest year available.
- "Internet Archive Wayback Machine". Web.archive.org. 2004-07-06. Retrieved 2011-09-21.
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- "Peoria Transportation Systems". Peoria-taxi.com. Retrieved 2011-09-21.
- "Welcome to YRC!". Myyellow.com. Retrieved 2011-09-21.
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- "Our History". Yellowcabsf.com. 1977-11-08. Retrieved 2011-09-21.
- "San Diego Yellow Cab". sandiego.driveu.com. Retrieved 2011-09-21.
- "Home - Yellow Cab Co". Order1taxi.com. Retrieved 2011-09-21.
- Yellow Cab Celebrates 50 Years of "Service to the Public", published in Trips 'n' Tips March 1965 
- Yellow Cab NYC
- Why does every city seem to have a Yellow Cab company? - Cecil Adams, Chicago Reader
- Yellow Cab Comprehensive article on Coachbuilt.com