Singapore is divided into 28 postal districts and comprises of 3 market segments; namely Central Core Region (CCR), Rest of Central Region (RCR) and Outside Central Region (OCR).
Central Core Region - It comprises of postal districts 9, 10, 11, Downtown Core and Sentosa.
Rest of Central Region (RCR) - RCR refers to the rest of Central Region which are Bishan, Bukit Merah, Bukit Timah, Central Area, Geylang, Kallang, Novena, Marine Parade, Queenstown, Southern Islands, Tanglin and Toa Payoh.









