Nineteen millimeters.
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Circles have a diameter, not length. The diameter of a US cent is 19 mm.
A US one cent coin measures 19mm, or 1.9cm, in diameter.
If you mean a US small cent (1856 to date) the diameter is 19.2mm and the thickness at the rim is 1.55mm.
a US 25 cent piece (a quarter) is very slightly under one inch in diameter.
There are several countries in which the minor currency unit is a penny - including the US where a cent is called a penny!The UK penny has a diameter of 20.3 mm.