The following is a list of Singaporean electoral divisions from 1955 to 1959 that served as constituencies that elected members to the 1st Legislative Assembly of Singapore in the 1955 Singaporean general elections.[1] The number of seats had increased to 25 from 9 since the previous election in 1951.
| Constituency | Seats | Electorate |
|---|---|---|
| Bukit Panjang | 1 | 8,012 |
| Bukit Timah | 1 | 9,173 |
| Cairnhill | 1 | 13,528 |
| Changi | 1 | 11,239 |
| Farrer Park | 1 | 12,242 |
| Geylang | 1 | 16,604 |
| Havelock | 1 | 12,835 |
| Kampong Kapor | 1 | 13,815 |
| Katong | 1 | 22,196 |
| Pasir Panjang | 1 | 13,812 |
| Paya Lebar | 1 | 12,817 |
| Punggol–Tampines | 1 | 6,628 |
| Queenstown | 1 | 7,015 |
| Rochore | 1 | 12,073 |
| Sembawang | 1 | 10,675 |
| Seletar | 1 | 9,402 |
| Serangoon | 1 | 8,402 |
| Southern Islands | 1 | 3,548 |
| Stamford | 1 | 13,207 |
| Tanjong Pagar | 1 | 13,430 |
| Tanglin | 1 | 16,177 |
| Telok Ayer | 1 | 11,547 |
| Tiong Bahru | 1 | 12,664 |
| Ulu Bedok | 1 | 16,903 |
| Whampoa | 1 | 12,345 |