In the first half of the 16th century, the areas where Camden Market and Primrose Hill are now located would not have been considered within the bounds of London. During that period, London was much smaller and primarily confined to what we now think of as the City of London, which is roughly a square mile area along the River Thames.
The areas north of this central core, including Camden and Primrose Hill, were largely rural or semi-rural at that time. They consisted mainly of open fields, small villages, and farmland. It wasn't until later centuries—particularly during the 18th and 19th centuries—that these areas began to be developed more extensively as part of London's expansion.
So in summary, Camden Market and Primrose Hill would have been outside the main urban area of London in the first half of the 16th century.