I agree that "
on a list" is what I would generally expect people to use.
renan torres-rivero“And, what if it's not written on a piece of paper? Let's say, in a file of a computer system or database?
And, does this imply that British speakers use "in" with "list" and not "on"?
Here more examples:
1. There were some surprising inclusions in the list.
2. Your name comes after mine in the list.
3. To her dismay, her name was not on the list.
4. It did not figure high on her list of priorities.
”
I would also agree that "in the list" is possible in sentence 2. However, the use of "on" in a sentence like number 2 would
not be at all unusual.
I imagine that if you wanted to add someone or something to a list in a certain place, and you used a verb such as "insert", then "in" (or "into") would probably be a more likely choice than "on".
In addition, I think the use of "in" is a bit dependent on how exactly the speaker is looking at a list. If the speaker is referring to one item among (i.e. "inside of" / "surrounded by" / "embedded in") many, there again the use of "in" might be more likely.
I suspect there is a slight usage difference between BE and AmE as regards the usage of "in/on a list", but my guess would be that it is not a huge difference.