The DeLaceys do not live in a city. As the creature relates his story about what has happened to him to Victor Frankenstein, he tells Victor,
A few months before my arrival they had lived in a large and luxurious city called Paris [France], surrounded by friends, and possessed of every enjoyment ...." (Chapter 14) But now, they are exiled because Felix was present at the unjust trial of a Turk, and he became implicated in this man's escape. Consequently, the DeLaceys had to flee France. The creature says,
"They found a miserable asylum in the cottage in Germany where I discovered them." (also Chapter 14)
It is while Felix takes a "long country walk" that the creature enters the cottage and talks to the old man. Also, if the DeLaceys were living in Paris, it would be extremely difficult for the creature to remain hidden or to find the berries and game on which he survives.
You can find the answer to this question by putting together a few facts that are found in the very beginning of Chapter 14.
First of all, we see that Safie's father has been living in Paris for many years. He is arrested in that city and thrown into jail.
Second, we see Felix De Lacey come to try to get Safie's father out of prison. He is horrified because he feels that the verdict and sentence in the trial are completely unfair. That is why he tries to get Safie's father out.
If he happens to be present for the trial, it seems likely that he lives in Paris where the trial was.