https://www.onemap.sg/index.html

http://www.onemap.sg/api/help/ evolved into

https://ohm.onemap.sg/#/index/main

https://services2.hdb.gov.sg/web/fi10/emap.html

Best view on PC

too bad there is no app developed yet

so far this can be the up to date official gov map

with block and postal code 

hope it be useful to you

One Historical Mapohm.onemap.sg

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