Where to find a barber in Fallout NV?
Only appears to be one way and that is using Sergio.
Sergio is a member of the Kings living in Freeside. He is located near the southernmost corner of the first floor of The King's School of Impersonation.
- The Courier can only take advantage of Sergio's services if the Courier joins the Kings, which can be done by completing the Kings quest-line and gaining the King's one favor.
Source: http://fallout.wikia.com/wiki/Sergio