When did they stop making copper pennies?

Answer

Pennies in the United States were made of pure copper from 1793 to 1837, and then contained varying amounts of copper throughout the years before converting to a majority 97.5 percent zinc in 1982. At that point, the penny continued to be made with a small 2.5 percent copper.

The most common materials replacing or mixing with copper over the decades were bronze, tin, nickel, zinc and zinc-coated steel. In 1943, copper was removed from the penny in order to utilize the metal in the war effort of World War II. A small number of copper pennies were minted that year and have since become valuable collectors items.

Reference:
Q&A Related to "When did they stop making copper pennies?"
They stopped making copper pennies in 1982. There are some 1982 pennies that are 95% copper and some that are not. 1983 pennies that are 95% exist but are rare and are collectors
http://wiki.answers.com/Q/When_did_the_us_stop_mak...
In mid 1982 US cents were changed from an alloy of 95% copper/5%
http://www.chacha.com/question/when-did-they-stop-...
1. Clean the pennies thoroughly. Heat a mixture of sodium hydroxide and powdered zinc in an evaporating dish over a hot plate until it is nearly boiling. 2. Keep the mixture near
http://www.ehow.com/how_8734616_make-turn-copper-s...
From 1783 to 1837, a cent was pure copper. But newer pennies are made mostly of zinc. Here's the history, according to the U.S. Mint: From 1837 to 1857, the cent was made of bronze
http://answers.yahoo.com/question/index?qid=200807...
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