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

Harrow is located in Greater London, United Kingdom, with 5 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
HA7 Examples of complete postal codes: HA7 4RQ HA7 4RR HA7 4RS HA7 4RT HA7 4RU	Harrow
HA5 Examples of complete postal codes: HA5 9HB HA5 9HH HA5 9HJ HA5 9HN HA5 9HR	Harrow
HA3 Examples of complete postal codes: HA3 9JS HA3 9JT HA3 9JU HA3 9JX HA3 9JY	Harrow
HA2 Examples of complete postal codes: HA2 9HJ HA2 9HL HA2 9HQ HA2 9HU HA2 9HX	Harrow
HA1 Examples of complete postal codes: HA1 4TN HA1 4TP HA1 4TQ HA1 4TR HA1 4TS	Harrow

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 5 unique postal codes indexed for this city. The registered list includes: ha7, ha5, ha3, ha2, ha1.

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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Harrow, Greater London (United Kingdom)