Singapore Postal Districts and Postcodes: Understanding the System

Singapore uses a highly organised postal district and postcode system to simplify mail delivery, identify locations, and uniquely code every building in the country. The system is critical for residential, commercial, and industrial addresses and is widely used by residents, businesses, and government agencies.

History and Format

The current six-digit postcode format in Singapore was introduced in 1995, replacing the previous four-digit postal code system. The four-digit system, in use since 1979, grouped addresses by larger postal zones, but could not uniquely identify every building. The new six-digit system ensures that each building, including HDB flats, condominiums, landed properties, and commercial premises, has a unique postal code.

Structure of the Postcode

Singapore’s six-digit postcode is designed to convey precise location information. The first two digits represent the postal district, which broadly corresponds to a specific region of Singapore. The remaining four digits uniquely identify a specific building or block within that district. This makes it possible, for anyone familiar with Singapore’s postal districts, to estimate the general location of an address just by looking at the postcode.

Map of Understand CCR, RCR and OCR in Singapore real estate

Postal Districts

Singapore is divided into 28 postal districts. In the above map and in the list below, I try to provide you an idea of where those districts are, and what the first two digits of their postcodes would be:

Postal Districts in the Real Estate Context

For real estate purposes, the postal districts are lumped into three groups: CCR, RCR and OCR. Click the link to understand these three acronyms.

In the context of Singapore real estate, the terms CCR (Core Central Region), RCR (Rest of Central Region), and OCR (Outside Central Region) are used to categorise properties into three broad market segments. These terms became widely recognised in the 2000s as Singapore’s property market developed into a global investment hub. Each region reflects a different level of prestige, price point, and location desirability.

Core Central Region (CCR)

The CCR represents the most prestigious and expensive parts of Singapore. It covers the traditional prime districts, the Downtown Core, and Sentosa. Properties here are considered luxury and command the highest price per square foot. The area includes many condominiums, upscale apartments, and landed properties, with proximity to shopping belts like Orchard Road and the central business district (CBD).

Districts in CCR:

Rest of Central Region (RCR)

The RCR consists of city-fringe neighbourhoods that are just outside the core but still centrally located. Homes here are more affordable than CCR yet enjoy easy access to the CBD. The RCR is popular among families and expatriates who want a balance between convenience and cost. Many areas here are seeing strong growth with new residential and commercial developments.

Districts in RCR:

Outside Central Region (OCR)

The OCR covers Singapore’s suburban areas, where the majority of HDB flats and mass-market condominiums are located. These districts are farther from the CBD but tend to be more affordable, making them highly attractive to local families. The OCR has been benefiting from infrastructure developments such as new MRT lines and town planning improvements, enhancing liveability and investment potential.

Districts in OCR:

The districts are still widely used in property listings, postal delivery, and even by locals when describing locations.

Singapore postal districts and postcodesSingapore postal districts and postcodes (27 August 2025 AI Generated)

How to Read a Postcode

Each postcode is unique to a building. To illustrate, let’s look at a fictitious example:

Fictitious character: Mr Tan Chee Seng

Fictitious address:
Blk 245 Ang Mo Kio Avenue 3
#07-156
Singapore 560245

Here’s how we can interpret this postcode:

So while the old four-digit system (used prior to 1995) grouped addresses by postal district 1–28, the six-digit system allows for each building to have a unique postcode. With this system, postal workers, delivery services, and residents can accurately pinpoint the exact building even if multiple blocks share the same street name.

With this system, postal workers, delivery services, and residents can easily pinpoint the exact building without confusion. Even if multiple blocks share the same street name, their unique postcode distinguishes them clearly.

Why the Postcode System Matters

Apps to Check Singapore Postal Districts

If you want to quickly find out the postal district of a building or address in Singapore, here are some useful apps and tools you can use:

1. OneMap by Singapore Land Authority

Platform: Web and mobile-friendly (via browser or official app)
Features: Search for any building or place name to view its address and postal code instantly. You can then compare the postal code’s first two digits with the postal district list.
Reliability: The most authoritative and up-to-date location data. Visit: onemap.gov.sg

2. Singapore Postal Code App (by Finmaxer)

Platform: Android
Features: Enter a six-digit postal code to get the full address, including building name, block number, and road name. Some versions also show the map location.
Download: APKPure

3. SG Map and Street Directory (by DxG Solutions)

Platform: Android
Features: Search addresses or postal codes and view detailed map information. Recommended for general street directory use. Does not label postal district explicitly.
Download: Google Play

4. SingPost Mobile App

Platform: Android & iOS
Features: Includes a “Find Postal Code” feature—enter a building number or street and it returns the six-digit postal code. Once obtained, you can determine the district from the first two digits.
Download: Google Play | SingPost Website

How to Determine the District from a Postal Code

Singapore’s postal codes are structured such that the first two digits indicate the postal district (1 to 28).

Once you obtain the postal code using any of the above apps, you can quickly identify its postal district by checking the first two digits against the district reference list.

Recommendation

For most users:

Quick Facts

References

  1. Singapore Post – Postal Code System
  2. Urban Redevelopment Authority – Postal Districts
  3. Singapore Infopedia – Postal Districts and Postcodes

Page Details

This page was created on 9 September 2025. Hi, my name is Timothy and created it from my research, for my own entertainment, knowledge and to satisfy my curiosity. I am providing the information to you in good faith and hope it is useful. I try to get the details as accurate as possible. I also try to update the page whenever I stumble on new details. So this and all my other pages are perpetual work in progress. If you discover any error, please politely inform me, pointing out where the error lies, and I will correct it as soon as possible. Your helpfulness will keep this page accurate, relevant and helpful to those who need the information.

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