The visit also follows North Korea's announcement that an American citizen has been jailed in Pyongyang on suspicion of committing "hostile" acts against the state. Richardson will try to address his detainment, the sources said.
Washington and Pyongyang do not have diplomatic relations. North Korea and the U.S. fought on opposite sides of the three-year Korean War before signing a truce in 1953.
However, North Korea has indicated interest in repairing relations with Washington.
Last year, a group of North Korean economists and diplomats visited Google headquarters in Mountain View, California.
And North Korean-affiliated agencies already use at least one Google product to get state propaganda out to the world: YouTube.