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, was one of the largest taxicab companies in the United States.
Yellow cabs date back to at least 1798, when the musical comedy, Cabriolet Jaune (Yellow Cab), debuted at Paris' Theatre de l’Opera Comique National. Yellow cabs were known in Paris and London throughout most of the 1800s. A yellow cab company shook up the New York Cab system in the mid-1880s, offering cheaper, more predictable fares than competitors. One of the first automobile cabs in London, in the 1890s, were yellow electric cabs.
The Yellow Cab Company of Chicago (not to be confused the Yellow Taxicab Co.) was founded by John D. Hertz in 1907. 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. However, "he was certainly not the first taxicab operator to use that color and the university study that Forbes refers to has yet to be discovered." 
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 $12.12 in 2016 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.
In 2017, a study showed that the color yellow, for taxis, was more noticeable, resulting in 9% fewer accidents.
Yellow cab companies
- The Yellow Cab Company of Baltimore, Maryland, was founded in 1909. It is currently owned by Transdev. (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 was founded in 1924 and operates in Queensland and Tasmania, Yellow Cabs operate in Melbourne and Yellow and Coastal Cabs are in Perth, WA (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.)
- California Yellow Cab, serving Orange County, California, has been in operation for over 60 years. It is owned by Keolis. (U.S.)
- Yellow Cab Company of Toronto (Canada)
- 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
- In Melbourne, all taxi companies have yellow-painted cabs.
- Yellow Cab of Burlington, Ontario
- Yellow Cab of Hyderabad, India
- New Yellow Taxi company based in Moscow, Russia
- ComfortDelGro in Singapore.
- Los Angeles Yellow Cab
- Brown, Peter Jensen. "New York, Paris, London (but not Munich); a Checkered History of Yellow Cabs". Early Sports 'n' Pop-Culture History Blog. Retrieved 3 February 2016.
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- "Yellow taxicab...". Coachbuilt.
- Forbes, Bertie C. (1927). Automotive Giants of America: Men Who Are Making Our Motor Industry. New York: B. C. Forbes. p. 147.
- Theobald, Mark. "Yellow Cab Mfg. Co.". Coachbuilt.com. Retrieved 3 February 2016.
- The New York Times (June 14, 1908)
- 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.
- Rice, Doyle (March 8, 2017). "If you want a safe taxi ride, yellow could be the way to go". USA Today. Melbourne, Florida. pp. 4B. Retrieved March 8, 2017.
- "Internet Archive Wayback Machine". Web.archive.org. 2004-07-06. Archived from the original on December 10, 2004. Retrieved 2011-09-21.
-  Archived December 20, 2008, at the Wayback Machine.
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- "Welcome to YRC!". Myyellow.com. Retrieved 2011-09-21.
-  Archived March 23, 2006, at the Wayback Machine.
- "Our History". Yellowcabsf.com. 1977-11-08. Retrieved 2011-09-21.
- "San Diego Yellow Cab". sandiego.driveu.com. Retrieved 2011-09-21.
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- "Taxi - KeolisNorthAmerica.com".
- "Home - Yellow Cab Co". Order1taxi.com. Retrieved 2011-09-21.
- "NYC Cab a.r.t.s llc 973-539-2500 NYC Taxi call a.r.t.s llc 973-539-2500".
- "Los Angeles Taxi, Taxi Cab Services In Los Angeles by RideYellow". Retrieved 2017-05-11.
- "The Yellow Cab Man". 7 April 1950 – via IMDb.
- 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