The Question and Answer section for Utopia is a great resource to ask questions, find answers, and discuss the novel.
This is a very detailed question for this short answer space. Check out the GradeSaver link below and you should be able to find some information:
The maximum population of a Utopia will consist of no more than 6,000 families or households.
Sir Thomas More traveled to Flanders in order to negotiate with the Spanish on behalf of King Henry VIII.