25 cents. 1984 is not an especially valuable coin unless it is a proof coin.
The New Orleans Mint closed in 1909 so you can't have a 1983-O quarter.
There were a lot of die problems with 1983 quarters so it's probably a badly-formed "D", for the Denver Mint. Any U.S. quarter dated 1965 or later that's found in change is almost certainly a standard circulation coin worth face value only.
In circulated condition it is worth face value. In uncirculated condition the values range from $1 to $4000.
Not enough info what condition is it in and what mint mark
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A quarter is worth 25 cents or $0.25.
A quarter is worth 25 cents.
If it is still a quarter in 2020 it would be worth a quarter of a dollar.
How can I fine out how much my quarter is worth??
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It is just a quarter.
A 1776-1976 no proof quarter dollar worth in 2012