Postnummeret er riktig.

In Norwegian, compound nouns are usually written as one word, much more often than in English.

So:

• post = mail/post
• nummer = number
• postnummer = postal code / ZIP code

Then postnummeret means the postal code, because the definite ending is added to the noun.

This is very normal in Norwegian:

• telefonnummer = phone number
• husnummer = house number
• postkontor = post office

The ending -et is the definite article attached to the noun. It means the.

So:

• et postnummer = a postal code
• postnummeret = the postal code

This is a key feature of Norwegian. Instead of usually putting a separate word like the before the noun, Norwegian often adds the definiteness to the end of the noun.

Because postnummer is a neuter noun, its definite singular form is -et.

Because in Norwegian, the definite article is often built into the noun itself.

Compare:

• English: the postal code
• Norwegian: postnummeret

So postnummeret already includes the meaning of the postal code.

A separate definite word like det is not used here, because that would usually only appear in other structures, such as with adjectives:

• det riktige postnummeret = the correct postal code

But in Postnummeret er riktig, the noun is standing on its own, so the ending -et is enough.

Because postnummer is a neuter noun in Norwegian.

Norwegian nouns have grammatical gender:

• en for many masculine/feminine nouns
• et for neuter nouns

So:

• et postnummer = a postal code
• postnummeret = the postal code

You usually just have to learn the gender together with the noun.

Er means is / are / am, depending on context. It is the present tense of å være (to be).

In this sentence:

• Postnummeret er riktig = The postal code is correct

Some other examples:

• Jeg er lærer = I am a teacher
• Hun er hjemme = She is at home
• De er klare = They are ready

Here riktig means correct or right.

So the sentence means that the postal code is the correct one.

Depending on context, riktig can also mean things like:

• correct
• right
• true
• proper

Examples:

• Det er riktig. = That is correct.
• Høyre eller venstre? = Right or left?
• Det riktige svaret = the correct answer

In your sentence, correct is the best translation.

This is a very common question.

Normally, many Norwegian adjectives add -t in the neuter singular:

• en fin bil = a nice car
• et fint hus = a nice house

But adjectives ending in -ig usually do not add another -t in the neuter.

So:

• en riktig adresse = a correct address
• et riktig postnummer = a correct postal code

That is why riktig stays riktig, not riktigt.

Yes, in principle it is.

After er, the adjective is predicative (it comes after the verb), but it still follows the normal agreement pattern where relevant.

In this case, though, the form is still riktig, because adjectives ending in -ig do not change in the neuter singular.

Compare:

• Postnummeret er riktig. = The postal code is correct.
• Svarene er riktige. = The answers are correct.

So agreement becomes more visible in the plural:

• singular: riktig
• plural/definite adjective form: riktige

Yes. Postnummeret er korrekt is also grammatical and natural.

The difference is mostly one of style and nuance:

• riktig is very common in everyday language
• korrekt can sound a little more formal or technical in some contexts

Both can mean correct here.

This is the normal word order for a simple statement in Norwegian:

subject + verb + complement

So:

• Postnummeret = subject
• er = verb
• riktig = complement/adjective

This is similar to English:

• The postal code is correct

Norwegian does have a verb-second rule, but in a basic main clause like this, the subject simply comes first and the verb comes second.

Yes. In general Norwegian use, postnummer is the standard word for a postal code.

When translating into English, the best choice depends on the variety of English:

• postal code is the broadest translation
• ZIP code is the usual American English term

So if the learner is American, they may naturally think of ZIP code, but the Norwegian word is still just postnummer.

The indefinite version would be:

Et postnummer er riktig.

That means A postal code is correct, which sounds less natural unless the context makes it clear why you are saying a postal code rather than the postal code.

More often, you might see:

• Det er et riktig postnummer. = It is a correct postal code.
• Postnummeret er riktig. = The postal code is correct.

In most real situations, the definite form is more natural because you are talking about a specific postal code.

That would be:

det riktige postnummeret

This is different from your sentence.

Compare:

• Postnummeret er riktig. = The postal code is correct.

  • Here riktig comes after er.

• det riktige postnummeret = the correct postal code

  • Here the adjective comes before the noun.

When an adjective comes before a definite noun in Norwegian, you usually get:

1. a separate definite marker (det / den / de)
2. the adjective in the definite/plural form
3. the noun in the definite form

So:

• det riktige postnummeret

A rough guide is:

POST-num-mer-et

A few helpful points:

• Stress is on the first part: POST
• The u in nummer is not like English you
• The final -et is usually said lightly

If you are learning Bokmål pronunciation, it is best to listen to native audio, because exact pronunciation can vary somewhat by dialect. But the important thing for beginners is:

• clear stress on the first syllable
• smooth connection of the whole compound as one word

No, not in a normal full sentence.

Norwegian needs the verb er here, just as English needs is:

• Postnummeret er riktig. = correct
• Postnummeret riktig. = not a normal complete sentence

You may hear shortened language in notes, headings, or very informal contexts, but in standard grammar you should include er.

The plural forms are:

• et postnummer = a postal code
• postnummeret = the postal code
• postnumre = postal codes
• postnumrene = the postal codes

Then your sentence in the plural would be:

• Postnumrene er riktige. = The postal codes are correct.

Notice that riktig changes to riktige in the plural.