What is the value of a 1909 us quarter?

1909 is a relatively common date for Barber Quarters. Look on the back of the coin to see if there's a small mint mark letter below the eagle. It may be blank or there may be a D, O or S.

Numismedia lists the following approximate retail values as of 04/2011:

No mint mark (Philadelphia):

Very worn condition - $8

Moderately worn - $20

Slightly worn - $34

Almost no wear - $132

Uncirculated - $192 to $7,740 depending on quality

"D" mint mark (Denver):

Very worn - $10

Moderately worn - $20

Slightly worn - $31

Almost no wear - $147

Uncirculated - $210 to $7,610

"O" mint mark (New Orleans):

Very worn - $15

Moderately worn - $104

Slightly worn - $210

Almost no wear - $540

Uncirculated - $1,000 to $20,800

"S" mint mark (San Francisco):

Very worn - $10

Moderately worn - $33

Slightly worn - $49

Almost no wear - $223

Uncirculated - $360 to $11,150

DISCLAIMER: The retail values quoted are the best available as of the date shown, but may vary significantly due to changes in the precious metals market. Also the wholesale (buying) price of a coin will be less than the selling (retail) price. A reputable coin dealer will be able to give a more accurate valuation based on inspection of the coin.