The Ministry of Health and National Environment Agency said in a joint statement this evening that of the 26 new cases reported today, 24 were linked to a cluster in the Aljunied district where the country's first locally-transmitted cases were reported.
The statement did not say where the other two cases were from.
A week after Singapore reported its first case of locally transmitted Zika infection, local scientists say they have completed genetic sequencing of the virus.
The Aedes mosquito-borne Zika, which has been detected in 67 countries and territories including hard-hit Brazil, causes only mild symptoms for most people such as fever and a rash.
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But pregnant women who catch it can give birth to babies with microcephaly, a deformation marked by abnormally small brains and heads.
Malaysia on Saturday confirmed its first locally transmitted case of Zika infection in a man living in the eastern Malaysian state of Sabah.