Central Ohio Transit Authority

Prior to COTA's founding, bus service in the area was managed by the privately owned Columbus Transit Company (CTC). In 1971 the CTC was in the midst of budget problems, so in order to maintain bus service in the area, the local governments of central Ohio created COTA. COTA acquired the assets from the CTC on January 1, 1974, and began operations the same day. COTA acquired the CTC bus service for $4.8 million. In mid-1974 COTA established its Park & Ride program and sets up the first routes at area shopping centers. At that time, cash fares were 50 cents.

In 1975, COTA launched the Key Card program, which provided a discount fare for those passengers with disabilities. By the summer of 1976, COTA had established 50 bus shelters. In 1977, COTA started the Commuter Club that offered unlimited riding for $20 a month. One of the first express bus services, the Beeline, was introduced in 1979 giving passengers a speedy ride up and down High Street. That same year, planning began on COTA's 400,000-square-foot (37,000 m2) operations center on McKinley Ave. In 1992, a 24-hour pass was introduced to allow riders unlimited trips to local and crosstown routes provided by COTA's new lift-equipped buses. From 2007 to 2008, the agency removed all exterior advertisements from its buses, citing diminishing ad revenue and desiring a clean, neat look to the buses.

The agency purchased its downtown office, the William J. Lhota Building, in 2008. Also in 2008, the city of Dublin was added into COTA service areas. In 2016, COTA introduced 4G connectivity in its buses, giving passengers better internet access and allowing for real-time bus tracking to improve communication and efficiency. Real-time bus tracking for passengers began in May 2016 through the Transit app.

On May 1, 2017, the agency overhauled its bus network, the first redesign since COTA's establishment in 1971. The effort simplified routes, increased bus frequency, connected more locations, and reduced bus congestion in downtown Columbus. The redesign doubled the agency's number of frequent lines (from four to eight) and significantly increased weekend service. The project caused a 3.6 percent increase in ridership by May 2018. In August 2017, COTA became the third large transit agency with fleet-wide passenger WiFi. On June 1, 2018, COTA began the C-Pass program, giving employees of certain companies downtown free rides on COTA buses. By 2019, the program enrolled about 420 companies. C-Pass is scheduled to be discontinued on December 31, 2020; property owners will decide whether to fund the program further.

In July 2019, the agency's customer service center at its headquarters closed for renovations. The project involved creating a larger, more inviting space, installing new ticket machines and a large display with transit information, and redesigning part of the building's exterior. The agency opened the new Customer Experience Center in November 2019. In the first "tactical urbanism" project COTA and the City of Columbus operated a temporary busway on Third Street in downtown Columbus from July 22 to August 2, 2019 in an area heavily congested during rush hour. The results were significantly decreased travel times, the average dropping over two minutes from Long Street to Noble Street. The project was inspired by the city of Boston converting a bike lane and on-street parking into a temporary busway. Also in 2019, COTA introduced the COTA Connector system for fare payments. The system includes a smart card that is available for purchase and refills, and a digital wallet through a smartphone app, allowing the use of displayed QR codes to pay when boarding buses.

In 2020, COTA reported 19.1 million riders in 2019, the system's highest ridership since 1988. Ridership had been steadily increasing over several decades, due to rising gas prices, COTA's bus network redesign, and other improvements. In March 2020, as the COVID-19 pandemic began affecting Ohio, ridership dropped approximately 40 percent. COTA introduced several measures in mid-March, including thorough cleaning measures, suspending fare collection, reducing all rush hour lines, and suspending its AirConnect and Night Owl services. On March 20, the agency recommended only using its services for essential travel; two days later it shut down several rush hour services and reduced frequencies of nine crosstown lines. On March 24, it stopped all rush hour services until further notice. On March 26, the agency began "dynamic service" to pick up customers left at bus stops by too-full buses, with bus capacity limited to 20 passengers.

On March 28, a COTA bus operator tested positive for the virus. On March 30, COTA suspended service on routes 21, 25, and 35. On April 7, a second driver tested positive for the disease. On the 11th, the agency announced it will require passengers to wear face masks. On April 27, following further route reductions and a third COTA worker testing positive, it announced all late-night and early hours would be cut, making all services only run from 7 a.m. to 9 p.m. Ridership declined, following a national and global trend. On May 2, as a portion of businesses began to reopen, COTA announced it will resume some early-morning services on May 5.

From May 30 to June 8, COTA rerouted service around downtown Columbus due to the city's George Floyd protests. On June 3, the agency gave a statement regarding its police transport activities during the protests. It had been criticized on social media, and responded that it is committed to breaking down institutional racism, and that its police transport role has been longstanding as part of its emergency service roles. The agency noted that it is not transporting arrested protesters as some agencies have been.

Services

CMAX

CMAX, a bus rapid transit service, runs along Cleveland Avenue from downtown to Westerville. The limited-stop service is estimated to be 20 percent faster than conventional service, using dedicated bus lanes during rush hours, and utilizing transit signal priority. The buses have USB charging ports; the stops have real-time information screens and some feature local art. The service began operation on January 1, 2018.

CMAX was created with $50 million in funding, primarily from the federal government. It was created to help reduce traffic congestion on Cleveland Avenue and bring economic activity to the area in and around Linden, a low-income neighborhood. The BRT line is the most modern in the transit system, with low-floor CNG buses painted red and blue, each with USB ports, and with bus shelters at each stop, many with local art and real-time countdown clocks, displaying the next buses to arrive.

CBUS

The CBUS was a free downtown circulator traveled along High Street between the Brewery District and German Village north through the Short North. The service had uniquely branded 30-foot buses stopping at round "CBUS" signs. The service operated every 10–15 minutes, seven days per week. The service began operation on May 5, 2014, and was ended in March 2020 during the COVID-19 pandemic. In August 2021, COTA announced that the service will not return.

COTA Plus

COTA Plus, stylized as COTA//PLUS, is a microtransit service in Grove City and northeast Franklin County. The service enables people to use a mobile app or call COTA's customer service to arrange a trip within service zones created for Grove City and northeast Franklin County. Fares are different than fixed-route COTA services, with single fares at $3, day passes at $6, and weekly passes at $20. C-Pass holders, university students, children, and those with discount IDs receive free or reduced fares relative to their eligibility for other COTA services.