In 1905 a by-election was held for a vacant London County Council seat at Fulham. Cobb was the candidate of the Conservative-backed Moderate Party, and succeeded in taking the seat from the majority Progressive Party. In 1907 the Moderates, reorganised as the Municipal Reform Party, gained control of the council. Cobb was to be a leading member of the authority for the next twenty-seven years, and was chairman in 1913 – 1914. He also served as chairman of the LCC's education committee. In 1934 the Labour Party gained control of the LCC, and Cobb lost his seat.
In the meantime, he had been elected to the Commons as Conservative Member of Parliament (MP) for Fulham West in 1918. He was briefly unseated at the 1929 general election, but regained the constituency at a by-election in the following year. He continued to represent Fulham West until his death.
He was made a member of the Royal Victorian Order in 1911 and a Knight of the Order of the British Empire in 1918. He also served as honorary secretary of St Saviour's Hospital, Regent's Park. He died at his London home in March 1938, aged 76.
- Obituary: Sir Cyril Cobb - Parliament and The L.C.C. The Times, 9 March 1938, p.16
- London County Council, The Times, 30 October 1905, p.9
- The Times House of Commons 1919. London: The Times Publishing Company (Limited). 1919. p. 19.
- Hansard 1803–2005: contributions in Parliament by Cyril Cobb
| Chairman of the London County Council
1913 – 1914
|Parliament of the United Kingdom|
|New constituency|| Member of Parliament for Fulham West
| Member of Parliament for Fulham West
1930 – 1938
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