The City of Singapore was the capital city of the Colony of Singapore, a British crown colony, and later served as the state capital of the State of Singapore within Malaysia, administered by the City Council as its local governing authority. Before 1951, the City Council was known as the Municipal Commission, and the area was referred to as the Town of Singapore. Singapore was formally accorded city status by the United Kingdom in 1951.

The remainder of the crown colony outside the urban boundaries was administered separately by the Singapore Rural Board. The city functioned as the capital of Singapore until its abolishment in 1965. Today, the former city boundary broadly corresponds to the modern Central Area, which sits in the south-eastern corner of the main island. For early elections under the colonial framework, electoral boundaries were directly mapped onto these municipal divisions. In the 1948 and 1951 legislative elections, constituencies were strictly bifurcated along the borders separating the Municipal Commission and the Rural Board territory.

Elevation to City Status (1951)

On 22 September 1951, the Town of Singapore was officially elevated to a city under a royal charter from King George VI. Following the proclamation, the Municipal Commission was renamed the City Council of Singapore, and the grand neoclassical Municipal Building was formally renamed City Hall.

The City Council quickly became a core political arena. Following local legislative reforms that introduced universal franchise, the 1957 City Council election resulted in a sweeping victory for the anti-colonial People's Action Party (PAP). To streamline resource allocation, reduce bureaucratic overlap, and avoid friction between the central government and local council leadership, Prime Minister Lee Kuan Yew began phasing out the city's separate administrative layer. The clause specified: