When to Use “Which”

If you wanted to discuss where you adopted the puppy you might say “The pound at which I found Spot was on State Street.” That’s a pretty formal-sounding sentence though. You might say that sentence in a courtroom or in another formal situation.

Other than maintaining formality there are two valid reasons you might want to use “which” instead of “where.” Many times you can add a preposition before the relative pronoun “which” to make your sentence quite precise. For example “The house at which I saw you” has a slightly different meaning from “The house in which I saw you.” If you use “where” you lose the subtle distinction: “The house where I saw you.”

The other reason you might want to use “which” is to avoid using a preposition at the end of a sentence which is considered informal. For example the sentence “This is the desk in which the papers are stored” is probably more appropriate to say in a formal setting than its informal counterpart: “This is the desk that the papers are stored in.” Some sticklers might object to that informal sentence. However if you are talking informally it is fine to end a sentence with a preposition or to use “where” instead of “in which” as here: “This is the desk where the papers are stored.”

When to Use “Where”

Think back to the puppy sentence we said at the beginning. You probably wouldn’t say “the pound at which” to a friend in normal conversation. You would most likely say “The pound where I found Spot was on State Street.” You might also find yourself saying “I found Spot at the State Street pound” bypassing the “which” or “where” conundrum altogether.

Another time you would probably favor “where” over “which” is when you’re using an informal contraction in your sentence. Take a sentence quoted in Garner’s Modern American Usage. Mr. Garner says “In the following example the contraction ‘I’ve’ might not comfortably fit in the same sentence as ‘in which’—hence ‘where’ is justifiable: ‘I’ve deliberately chosen an example where this unspeakable cluster did not stand out’” . I’m not sure what cluster this person is talking about but that is irrelevant for our current discussion. We’re just pointing out that a formal “which” doesn’t sound right alongside an informal “I’ve.”


If your audience expects formal grammar use a “which” construction. If your audience is more relaxed you can use “where.”
If you do choose to use “where” though you need to be aware of one common error. When you use “where” you need to ensure that you’re talking about place not time. For example it would be incorrect to use a form of “where” in this sentence: “He was born somewhere around 1970.” The year 1970 is a time not a place so you would have to say “sometime” instead of “somewhere.”