science

List of ISO 3166 country codes

List of ISO 3166 country codes is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand List of ISO 3166 country codes rather than just read about it. In short: The International Organization for Standardization (ISO) created and maintains the ISO 3166 standard – Codes for the representation of names of countries and their subdivisions. The ISO 3166 standard contains three parts: ISO 3166-1 – Codes for the representation of names of countries and their subdivisions – Part 1: Country codes defines codes for the names of countries, dependent territories, and special areas of…

Key takeaways

List of ISO 3166 country codes belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect List of ISO 3166 country codes to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of List of ISO 3166 country codes from memory before moving on to harder problems.

Reference excerpt

The International Organization for Standardization (ISO) created and maintains the ISO 3166 standard – Codes for the representation of names of countries and their subdivisions. The ISO 3166 standard contains three parts:

ISO 3166-1 – Codes for the representation of names of countries and their subdivisions – Part 1: Country codes defines codes for the names of countries, dependent territories, and special areas of geographical interest. It defines three sets of country codes: ISO 3166-1 alpha-2 – two-letter country codes which are also used to create the ISO 3166-2 country subdivision codes and the Internet country code top-level domains. ISO 3166-1 alpha-3 – three-letter country codes which may allow a better visual association between the codes and the country names than the 3166-1 alpha-2 codes. ISO 3166-1 numeric – three-digit country codes which are identical to those developed and maintained by the United Nations Statistics Division, with the advantage of script (writing system) independence, and hence useful for people or systems using non-Latin scripts. ISO 3166-2 – Codes for the representation of names of countries and their subdivisions – Part 2: Country subdivision code defines codes for the names of the principal subdivisions (e.g., provinces, states, departments, regions) of all countries coded in ISO 3166-1. ISO 3166-3 – Codes for the representation of names of countries and their subdivisions – Part 3: Code for formerly used names of countries defines codes for country names which have been deleted from ISO 3166-1 since its first publication in 1974. The ISO 3166-1 standard currently comprises 249 countries, 193 of which are sovereign states that are members of the United Nations. Many dependent territories in the ISO 3166-1 standard are also listed as a subdivision of their administering state in the ISO 3166-2 standard, which is the case for China, Finland, France, the Kingdom of the Netherlands, Norway (Svalbard and Jan Mayen are listed, but Bouvet Island is not), and the United States of America, but not Australia, Denmark, New Zealand, or the United Kingdom of Great Britain and Northern Ireland.

Current ISO 3166 country codes The sortable table below contains the three sets of ISO 3166-1 country codes for each of its 249 countries, links to the ISO 3166-2 country subdivision codes, and the Internet country code top-level domains (ccTLD) which are based on the ISO 3166-1 alpha-2 standard with the few exceptions noted. See the ISO 3166-3 standard for former country codes.

For user-assigned codes used by certain organizations, see ISO 3166-1 alpha-2 § User-assigned code elements and ISO 3166-1 alpha-3 § User-assigned code elements.

Worked examples

Example 1 — a first encounter with List of ISO 3166 country codes

Start with the simplest possible case. Write down what List of ISO 3166 country codes claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to List of ISO 3166 country codes before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about List of ISO 3166 country codes ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of List of ISO 3166 country codes

In research: List of ISO 3166 country codes appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses List of ISO 3166 country codes in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: List of ISO 3166 country codes is common in secondary-school and first-year university syllabi. It links to neighbouring topics Geography-related lists, ISO 3166, ISO standards, so understanding it makes those chapters shorter.
In everyday life: Look for List of ISO 3166 country codes outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study List of ISO 3166 country codes in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what List of ISO 3166 country codes means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain List of ISO 3166 country codes out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is List of ISO 3166 country codes in simple terms?

Why does List of ISO 3166 country codes matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study List of ISO 3166 country codes?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on List of ISO 3166 country codes.