What is the value of an 1889 US dime?

Check on the back to see if it has a small "S" mint mark letter. Numismedia lists the following approximate retail values as of 02/2010:

No mint mark (Philadelphia):

Very worn condition - $10

Moderately worn - $14

Slightly worn - $17

Almost no wear - $71

Uncirculated - $132 to $3,970 depending on quality

"S" mint mark (San Francisco):

Very worn condition - $13

Moderately worn - $23

Slightly worn - $40

Almost no wear - $178

Uncirculated - $468 to $4,590