How to know your postal code: What is My Zip/Postal Code

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What is a Postal Code and Their Different Formats

What are Postal Codes and How Do They Work?

Businesses of all kinds are familiar with terms like address cleansing and ZIP+4 code. They are aware that you need a complete ZIP+4 code to send and receive packages via USPS without any delays and to ensure the mail’s deliverability. Yet, businesses often remain ignorant of what is what and focus solely on their campaigns/efforts and their reach.

Businesses must realize that they need to have a comprehensive idea of what is what if they are to come up with feasible and innovative solutions. You can’t be inspired to come up with a smart solution or alternative with a limited understanding of what you are dealing with. And as far as a company’s direct mail efforts are concerned, the postal code is the perfect place to start.

You need to understand what is postal code is so that you can have a better understanding of how your direct mail efforts work. This article discusses what postal code is, how the ZIP+4 code fits into pictures, and how it is important for your address verification and validation process.

What is Postal Code?

Postal codes are a set of numbers, a particular set of numbers (although it sometimes includes letters too) that helps postal services determine the destination of a mail. The postal code allows a mail to reach its destination, and full ZIP+4 ensures it reaches the destination ASAP.

The use of postal codes is standard practice across nations all around the world. Even though the details may be different, the basic functioning is similar everywhere.

The postal code system across different countries may vary, and so will their format but their purpose remains the same, and that is to make postal delivery easier. Every stage in postal delivery is optimized by the use of postal codes. This optimization includes the batching of posts sent to a particular state to the stage where the postman makes the delivery. In essence, the postal code dictates the extent of the delivery jurisdictions.

So, every address that falls under the same delivery jurisdiction will have the same postal code assigned to it. However, this broad classification only applies to a part of the code if you are referring to a full 9-digits postal code. It is also worth noting that sometimes the postal codes are based on their geographical areas or even administrative boundaries in some cases. On the flip side, sometimes they are free-floating in nature or integral to a certain organization or a single delivery point.

It may feel that the postal code allocation may very well be random with so many different bases for their allocations, but there exists a common element between all of them. And what is that?

Well, postal codes are closely linked to the delivery route of a postal employee. It makes perfect sense to do it this way because the purpose of the postal codes is to streamline their delivery process, reducing the time required for deliveries through effective planning.

How the Postal Code was Created

The postal codes had a massive impact on all the activities related to postal delivery, and this goes for every country in the world. A system that is simple yet effective enough to manage the postal operations of big countries such as the US. As an address verification company that works closely with postcodes, we can’t help but get a little excited when talking about the origin of postal codes.

So the story begins when the cities in the US start to grow bigger and bigger. As the cities kept on growing, the delivery of postal mail also became more and more challenging. Soon there were not enough postmen or post offices to deliver all the letters; keep in mind that this was at a time when letters were the only means of communication for the vast majority of the population.

The most obvious solution at this point was to simply meet the increased demand for postal services was optimize the logistic capability of the postal body. To optimize the logistical capabilities, more post offices were built and more postmen were hired. But the problems were only beginning because the postal delivery was potentially a management nightmare.

Why? Because despite having new post offices and new postmen to deliver the mails, it still did not rectify the problem of how one would find the different addresses.

There were a lot of questions that were left unanswered, such as which post office would deliver to an address that is exactly halfway between two post offices?

An efficient way had to be developed that is productive in a way that none of the resources went to waste.

A similar situation prevailed in different parts of the world during the time. It was in London that they first started using postal codes in the late 1800s. London was subdivided into ten different districts to meet the postal delivery requirements and is often signified as the first source of postal codes. They called these newly classified districts postal districts or postal zones.

To keep track of them effectively, they were all numbered, and that is how “postal district numbers” or “postal zone numbers” came into being. Although during the first World War, such systems already existed in various European countries, the one from London is often regarded as the origin.

The US began using the postal code system a bit later but not later than the 1920s. Since then, the postal delivery system has gone through numerous changes and optimized for better and faster deliveries. Even with all the progress that we have made since then, the district numbering system is still the foundation on which the modern-day postal codes are built.

Using Postal Codes Across the Country

The postal code that had its inception in London was merely the tip of the iceberg. The district code created in London was a primitive one because it only ever covered a big city and nothing more. As one would expect from a new system, even though it had some sound logic behind the first postal code was not effectively implemented. The system was perfected over the years and evolved itself to what we now see around the world.

For starters, the first postal code was created only for big cities like London. It was never equipped to cover larger areas like states or the country. They lacked the systematic superiority to implement them on a larger scale. It was the Ukrainian Soviet Socialist Republic that first implemented a country-wide postal code system back in 1932. However, this did not last as they failed to implement it efficiently, and it was finally discontinued in 1939.

If you are looking for a functioning example of a postal system in history, then you will have to go to Germany in 1941. Even though they were dealing with the war at the time, the Germans still managed to keep effective postal communication throughout the country. Later in 1963, the US also joined the club by implementing the ZIP-code system. In the meantime, it took another decade for the UK that actually began the practice of postal code to implement it nationwide.

But we have not once had to look back ever since the introduction of a nationwide postal code system. The beauty of the system and probably the reason that it has not been replaced by an alternative system is its ability to expand. It allows countries to expand and accommodate new or additional areas simply by adding new digits to the already existing code.

The postal codes are much more than just a means of delivering direct mail today. They help in geocoding, address validation, and more. They can help you with identity verifications and even check for stolen credit cards. At this point, the postal code is not something you can afford to be ignorant about because it has many real-life uses, and you never know when you might need one in your personal or professional life.

International Mailing Postal Code Names

We have already made it clear that countries around the world use a postal code system. However, it is not necessarily called a postal code everywhere around the globe. It’s similar to how in the US we call an elevator an “elevator,” and in the UK, they call it a “lift,” and we haven’t even considered the non-English speaking countries yet.

Every country has a different term, and below we take a look at some of the most popular ones.

  • In the US, we call the postal service the ZIP code or “Zone Improvement Plan.” The “Postal Code” is a generic term, and it is universally applicable, it also happens to be the name used by Canada’s postal service
  • Many English-speaking nations like the Netherlands use the name Postcode which, as you can see, is just a slightly different variant of the “postal code”
  • In Italy, they call it CAP, which is short for “Codice di Avviamento Postale” which further translates to Postal Expedition Code
  • In Ireland, the postal code goes by the name Eircode, which is their latest delivery code system. Brazil calls it “Código de Endereçamento” (CEP), which in English means Postal Addressing Code
  • In India, the postal codes go by the name “Postal Index Number code” or PIN code/Pincode
  • The Germans call it “Postleitzahl” or PAZ, which conveniently translates to “postal code”

Postal Code and Their Different Formats

Although there are certain generalities when it comes to postal code format, they still have many variations, and it is essential to understand these different formats.

Beginning with the characters used in the postal codes, you need to keep in mind that the actual composition may vary depending on the country, and hence all the places may not necessarily use all the characters.

You can expect three kinds of symbols in a postal code. The first of these symbols that you will notice are the numbers 0 to 9, or the ten base characters of the Arabic decimal system if you want it in technical terms. As you may have very well guessed, the second of these symbols is the alphabets A to Z, or all 26 letters of the basic Latin alphabet. The third and final one of these symbols is the hyphens and spaces.

The majority of countries use only the numbers in their postal codes. However, it is worth noting that the hyphens and spaces are also used in varying saturation levels. That being said, this is not always the case as some countries out there use a more complex system that throws in alphabets to the mix, making their postal codes alphanumeric.

Canada, Venezuela, the United Kingdom, Swaziland, the Netherlands, and Ireland are some of the more popular countries that employ an alphanumeric postal code.

The Role of Location in Mailing Postal Codes

Instead of assigning random numbers and letters to addresses around the city (or country, for that matter), the postal codes are attributed based on their location and deliverability. Grouping together the addresses in a systematic manner makes way for easier labeling. Take the ZIP codes in the US.

For example, the first digit of the full 9-digits ZIP code indicates the region of the country where the postal mail is destined to go.

Suppose the first digit of the ZIP code is 0, then it is headed for New England, and similarly, each digit specifies a particular region in the country. However, you should remember that this system may change from country to country.

As far as the US is concerned, its codes are generally based on administrative areas. This means that the first number of the ZIP code will give you a fairly accurate idea about the destination country.

That being said, on the practical side of things, ZIP codes often cross county, city, and state boundaries. So what does this mean for the postal code? Well, this means that although it is likely that the ZIP codes are closely linked to the administrative boundaries like cities and states, it is by no means compulsory. As we briefly mentioned before, it all comes down to optimizing the delivery process, and hence the most productive way for running the mail is adopted.

Another thing you should be aware of is that sometimes when the codes are not based on a boundary, they are tied to the recipients.

For example, PO boxes usually have their own postal code or postal code suffix. It is also normal for large buildings and organizations to have their unique codes because of the large volume of mail they send and receive.

Postal Code Accuracy

The postal code accuracy can also be subject to variation from country to country, meaning some codes can be more accurate, or some may be less accurate. The ZIP code used in the US comes with what is called a “block-level” accuracy. This implies that the mails sharing the same ZIP+4 code will be delivered by the same delivery man or share the same delivery route. This is one of the most accurate postal codes in the world, and the USPS assures delivery as long as you have a validated address.


The Postal Code system is an international system used across countries around the world. Although its name, application, and mode of operation can change from country to country, the basics remain the same. The postal code used in the US is the ZIP code, and it comes with a “block-level” accuracy which is one of the best in the world.

However, the postal code accuracy is not worth much if you do not have a validated set of addresses, and this is especially important for businesses that regularly send out postal mails. You need an advanced address verification tool like PostGrid that can provide you with an accurate ZIP+4 code of the addresses with its Address Verification API that has Zip Code API and Postal API so that you can ensure that your marketing efforts are functioning in their optimal condition.

What is a postal code, how to decipher it correctly and find out the required value?

Despite the rapid development of information technology, mail has not lost its relevance and is still used when it is necessary to transfer a parcel, documents, and so on. To do this, it is important to know what a postal code is, because without specifying the code it is impossible to send.

Postal code — what is it?

Nowadays, most correspondence services use different fonts to make their work easier. In the Russian Federation, a postal code is a specific sequence of letters or numbers that is added to an address to facilitate sorting of mail. It is important to understand that such a digital designation is not assigned to a specific address, but to a specific territory that belongs to a specific department.

History of the postal code

For the first time such a cipher appeared on the post office of the Ukrainian SSR in 1932. Then it looked like it included two numbers and a letter, for example, 14U8. The letter in sequence meant the country, the numbers: «14» — the city, and «8» — the postal district. Large cities had several city indexes. For example, numbers from 11 to 20 belonged to Kyiv. This innovation was experimental and lasted until 1939. Once again, military units learned about what a digital postal code is. The code was necessary to classify the address of the parcel. A conditional number with an arbitrary sequence of digits replaced the name of the military unit.

In the post-war period, such encryption for correspondence began to be used in the West. In 1962, this came to West Germany, and in 1971 the well-known six-digit combination appeared in the USSR, which has survived to this day. It is worth noting that an index for mail can be assigned not only to a certain area, but also to large organizations if they work with a large amount of correspondence. To date, 192 states use this cipher.

Why do you need a postal code?

A combination of numbers to determine the location of the addressee was invented to simplify and speed up the sorting of correspondence. Knowing what the correct postal code is, you need to know what it is used for:

  • mail optimization;
  • reduction of manual labor;
  • efficient sorting;
  • expedited mail delivery;
  • error exceptions when moving parcels.

Indexes are written in angular numerals, which makes it easy for computers to read this format. Envelopes contain sample writing characters and a special form of thin dotted lines. The standard stylized writing of numbers protects the sender from mistakes and makes mail sorting easier. Describing why a postal code is needed, it is worth noting such a nuance — if there is a filling error, or there is no code, the letter may be lost or arrive with a long delay. Numbers are allowed to be written in any color, except for green, yellow and red ink.

How is the index deciphered?

The modern postal division has corresponded to the administrative division since 1998. At present, the index numbers in Russia are the logical sequence of the XXXYYY format:

  • XXX is the numeric code of the city;
  • YYY is the numeric code of the branch.

For example, the postal address is 414041: 414 is the city code of Astrakhan, 042 is the number of the post office located on Bumazhnikov Avenue. The exceptions are Moscow and St. Petersburg. These are major cities and several codes are used here. In Kazakhstan, since 2015, a transition has been made to a seven-digit alphanumeric sequence in the form of XYY ZZZZ, where X is a region, YY is a city or district, ZZZZ is a separate building.

How can I find out my zip code?

There are several ways to find out your postal code today:

  1. Go to the nearest branch, where employees will provide all the information.
  2. Use a help program, such as 2GIS. It helps to determine the address of any building in Russia. To find out the postal code of the desired house, find it on the map and click on it.
  3. Use a directory indicating all Russian postal codes. Make sure the information is up to date.

Postcode at

The postal code is a sequence of letters or numbers that is added to the postal
address. The main task of the index is an additional designation
post office. Thanks to him
It is easier for postal employees to sort correspondence. Indices for today
almost everyone uses the day
postal services of the country.


For the first time the concept of «Index» began to be used in the Soviet Union from 1932 years old. It looked like this —
«number-letter-number». The letter in the middle denoted the country to which the postal item was addressed. Number
the end is the post office number. The first number that was before the letter corresponded to the city,
which the shipment is being forwarded. In 1932 the capital of the Ukrainian Soviet Socialist Republic
Kharkiv. It was here that the first special directory of postal addresses of Ukraine was published this year.
The index numbering in it started from 1 to 10.

West Germany introduced the first postal indexing system in 1962. After that in
Over the years, it has been actively introduced in other countries. It was the German postal indexing system that served
other countries as an example.

In our country, the postal code gained its popularity after the Second World War in 1972.

To date, postal codes appear in the address systems of 192 countries around the world. Exactly these
are members of the Universal Postal Union.

Application of postal code

Different countries of the world use completely different schemes for designing and placing a postal code on
forwarded correspondence.

In Europe, the postal code comes before the name of the locality and often contains an alphabetic code
countries. In America, the locality is indicated first, and only then its postal code. AT
The Soyuz 1 or 2-letter code always precedes the name of the locality, although often precedes it
there is a letter indicating the recipient country.

In most cases, the index is assigned to a specific area, sometimes it can indicate a code
with huge volumes of incoming mail. This is done to facilitate sending and receiving by this
company of letters and parcels. It can be both state institutions of different levels, and large
corporations with huge volumes of correspondence. Different countries of the world practice this scheme.

In the case of automated index recognition systems, a special template is used under
called «code stamp». In most cases, this is a stencil or grid for indicating numerical
Such an index grid may be indicated on envelopes or postcards. All that remains
is to enter the correct numbers. If there is any doubt about the correctness of the indicated numbers and
lack of time or opportunity to check the code, it is best to write the index of the city or town
where the mail is sent. In this case, the postal service employees at the address can easily
indicate the index of the post office where the letter or parcel is sent.

How to find out the index

There are several ways that a person can find out the postcode of the settlement.


Directly at your post office, before sending a letter, ask the postal staff
indexes. It is in it that the postal codes of all the settlements of our country are collected and structured.
In addition, to further verify, you can check the value found with the postal staff. It —
the most traditional index lookup method.


To date, information technology has firmly entered the life of almost every one of us. Now to
to know
The index can be dispensed with without going to the post office. All you need is to open the corresponding email
directory of indices of the Russian Federation and select the information you need. Find out the postal code
countries of the world is also not difficult. To do this, you need to visit other Internet resources where it is provided.

Interesting Facts

Finland has a postal code like «99999». It was created specifically for Korvantunturi — a place
Santa Claus lives. In Greenland, Santa Claus also has his own postal code, «2412».

But in Canada, the number of letters for Santa Claus increased every year at a tremendous pace, which the authorities in
The decision was made to launch a special response program to these letters.

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