Denmark is only about 150 miles away from the Netherlands. Linguistic distance does not always match geographic distance, so how close are their languages, Danish and Dutch? Let’s find out.
Dutch and Danish are both Germanic languages. Dutch is the 3rd most-spoken Germanic language with 24 million native speakers, while Danish is the 6th most spoken with 5.5 million native speakers.
(The most spoken Germanic languages are English and German. Then comes Dutch, followed by Swedish and Afrikaans, and next comes Danish followed by Norwegian.)
The family of Germanic languages is divided into two subfamilies:
As a North Germanic language, Danish comes from Old Norse (which was the language spoken by the Vikings).
Dutch descends from Frankish, a language that was spoken between the 5th and 9th centuries in areas that are today the Netherlands, Belgium, and north-western France.
Two languages are said to be mutually intelligible when they are similar enough that their speakers can understand each other without prior study.
Dutch and Danish are not mutually intelligible. Dutch and Danish belong to separate branches of the Germanic languages (West Germanic vs. North Germanic). Even English which is in the same branch as Dutch is not mutually intelligible with Dutch.
Despite Dutch and Danish not being mutually intelligible, these languages share some similar vocabulary words (which we shall see examples of).
Here are some examples of vocabulary words that are similar in Danish and Dutch:
In terms of vocabulary, Dutch and Danish are more similar than either of these languages is to English.
To measure how similar two languages are in terms of their vocabulary, linguists calculate lexical similarity scores between them.
The Dutch-Danish lexical similarity score is higher than both the Dutch-English and the Danish-English lexical similarity scores. 
The reason is the large number of English words derived from Latin, which have entered the English language as loanwords from French.
Words spelled with double vowels are frequent in the Dutch language, in contrast to Danish where double vowels are rare.
In Dutch, double vowels serve to indicate long vowel sounds. Danish is also a language that distinguishes between short and long vowel sounds. In Danish, this is done by using double consonants to indicate that the preceding vowel is short.
The Danish language has 3 additional letters which are not found in Dutch. These are 'æ', 'ø' and 'å'. Although Dutch does not have any special additional letters, it does have the letter combination 'ij', which is a digraph that in some ways behaves as a separate letter.
The common ancestor language to Dutch and Danish, the “Proto-Germanic language” had a somewhat complicated grammar.
In the Proto-Germanic language, nouns were declined according to 6 grammatical cases.
Some Germanic languages have preserved systems of grammatical cases, for example, Icelandic and German.
In this respect, Dutch and Danish are similar in that they have done away with grammatical case declensions for nouns.
Despite the similarities in vocabulary between Dutch and Danish, they are not the most closely related Germanic languages:
Here are some examples of Dutch and Danish vocabulary words which are significantly different:
The letter ‘z’ is not typically used in Danish vocabulary words although is fairly common in Dutch, appearing in about 7.5% of vocabulary Dutch vocabulary words.
The letter ‘w’ is generally not found in Danish vocabulary words, in contrast ‘w’ is a common letter in Dutch. About 10% of Dutch vocabulary words contain the letter ‘w’.
Another noticeable difference between Dutch spelling and Danish spelling is that double vowels are frequent in Dutch but not in Danish.
Looking at the thousand most common words in Dutch and Danish, we observe that:
A comparison of Dutch and Danish would not be complete without discussing verb conjugations.
In contrast to Dutch, Danish verbs do not conjugate according to number and person. In Danish, the verb has the same form for all subject pronouns.
For example, here is how the verb “to read” is conjugated in the present tense for both Dutch and Danish.
Dutch and Danish are both relatively easy languages for English speakers to learn.
In fact, the Foreign Service Institute ranks languages into 4 categories according to their difficulty, and Danish together with Dutch are both in category 1 (easier languages that are most similar to English).
Despite this, Danish is known for having a pronunciation that is somewhat difficult for people learning the language.
In their written form, Dutch and Danish are both among the easiest languages to learn but in their spoken form Danish is a bit more difficult than Dutch.
To continue learning about the similarities and differences between Danish and Dutch, have a look at these lists of the 1000 most common Danish words, and the 1000 most common Dutch words.References: