"I am not married."
Translation:Ik ben niet getrouwd.
This is a sentence with two verbs: a conjugated verb and a participle.
The conjugation of the verb 'to be' is the conjugated verb in this case and 'getrouwd' is the participle.
Sentences like these take the following word order:
subject + conjugated verb + the rest of the sentence + participle
This means that the word order we're looking for here is: Ik (subject) ben (conjugated verb) niet (rest of the sentence) getrouwd (participle).
Alternatively, if the married part would be emphasized, the following word order would be okay too: "Getrouwd ben ik niet." = "Married I am not."
More on Dutch word order can be found here. :)