When did the US stop making nickels?

Nickels (5-cent coins) are still made. They are 75% copper and 25% nickel and cost more than 9 cents each to produce. The metal value in 2011 was about 7 cents.

Shield nickels were made from 1866 to 1883.

Liberty nickels were made beginning in 1883 and stopped in 1912.

The Buffalo nickels were made beginning in 1913 and stopped in 1938.

The "Jefferson profile" obverse coins were replaced with new versions in 2005 with another change in 2006.