Croydon Postal Codes & Phone Area Query - Greater London, United Kingdom

Croydon is located in Greater London, United Kingdom, with 8 postal codes indexed, using area code 20. This page provides a complete postal code list and a random phone number generation tool based on real dialing rules.

Postal Code Rules Notice

The postal codes displayed under the current city (e.g., WN7) are Outward Code prefixes. For your convenience, we have directly listed examples of partial real, complete postal codes corresponding to this prefix in the list below (format: SW1A 1AA). Clicking on the corresponding postal code will take you to the details page of that area, where you can view all complete postal code details and use local dialing rule-compliant phone generation tools.

UK Postal Code Structure and Rules:

1. First Part (Outward Code / Outward Postcode):

2 to 4 characters in length (e.g. SW1A, M1). Represents the Postal Area and the District under the postal area. Composed of 1-2 letters plus 1-2 digits (or alphanumeric combination), used to route mail to the correct UK sorting center.

2. Second Part (Inward Code / Inward Postcode):

Fixed at 3 characters (e.g. 1AA). Represents the specific postal sector (Sector) and the specific delivery point unit (Unit). The first digit is fixed as 0-9, and the last two are letters (C, I, K, M, O, V are not used to avoid confusion). Precise down to a street or specific building.

Postal Codes Directory

The following postal codes are indexed for this geographical region.

Postcode	District / Neighborhood
SE25 Examples of complete postal codes: SE25 6UG SE25 6UH SE25 6UJ SE25 6UL SE25 6UN	Croydon
SE19 Examples of complete postal codes: SE19 3JR SE19 3JS SE19 3JT SE19 3JU SE19 3JW	Croydon
CR9 Examples of complete postal codes: CR9 3WN CR9 3WQ CR9 3WX CR9 3XF CR9 3XT	Croydon
CR8 Examples of complete postal codes: CR8 5JU CR8 5JW CR8 5JX CR8 5JY CR8 5JZ	Croydon
CR7 Examples of complete postal codes: CR7 8RU CR7 8RW CR7 8RX CR7 8RY CR7 8RZ	Croydon
CR5 Examples of complete postal codes: CR5 3JT CR5 3LA CR5 3LB CR5 3LD CR5 3LE	Croydon
CR2 Examples of complete postal codes: CR2 9DS CR2 9DU CR2 9DW CR2 9DX CR2 9DY	Croydon
CR0 Examples of complete postal codes: CR0 9HY CR0 9HZ CR0 9JA CR0 9JB CR0 9JD	Croydon

Random Local Phone Numbers

Mock phone numbers matching local formatting and dialing area codes. (20) — Greater London

Frequently Asked Questions

How many ZIP codes are registered for this city?

There are currently 8 unique postal codes indexed for this city. The registered list includes: se25, se19, cr9, cr8, cr7, cr5, cr2, cr0.

What is the local dialing format for this region?

Local phone numbers follow the dialing prefix rules. Numbers generated locally are 11 digits long and utilize regional area codes: 20.

Local Dialing: Within the same area, dial the standard subscriber number directly without country prefix.
International Dialing: To dial internationally, prepend the country dial code followed by the local area code and number.

Can these numbers receive real verification codes?

No. These generated numbers are mock telephone numbers designed exclusively for software testing, quality assurance verification, and compliance mock databases. They cannot receive SMS or standard voice calls.

What do the digits in these postal codes represent?

In the United States, the first three digits of a ZIP code typically refer to a specific sectional center facility (regional mail hub), while the last two digits represent the specific delivery area or post office within that zone.

How can I find the exact ZIP code for a specific street address?

You can browse the detailed neighborhood mapping table on our site, or visit the official postal authority website (such as USPS for the USA) and input the complete street, city, and state information to retrieve the exact code.

Does this city support both 5-digit and ZIP+4 codes?

Yes. This website displays the standard 5-digit base postal codes. For actual mailing, a hyphen followed by a 4-digit extension (e.g., 90001-1234) can be appended to identify specific street segments, buildings, or post office boxes.

Can the phone numbers generated here be used for real calls?

No. The numbers use real regional area codes, but the subscriber numbers are randomly generated mock sequences. They are intended for developers to test input validation and UI formatting in application workflows. They cannot make or receive actual calls.

How frequently is the postal database updated?

Our database is periodically synchronized with official postal releases (like the USPS directories) to ensure that base codes and local district mapping rules remain accurate and up-to-date.

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Croydon, Greater London (United Kingdom)