3420

3420 may refer to:


 * A.D. 3420, a year in the 4th millennium CE
 * 3420 BC, a year in the 4th millennium BCE
 * 3420, a number in the 3000 (number) range

Other uses

 * 3420 Standish, an asteroid in the Asteroid Belt, the 3420th asteroid registered
 * IBM 3420, a 9-track open reel tape drive unit
 * Hawaii Route 3420, a state highway
 * Texas Farm to Market Road 3420, a state highway