Pretty sure the labor certification and prevailing wage requirement is on a county / city basis (i.e. somewhat related to the actual local wages), see also http

Pretty sure the labor certification and prevailing wage requirement is on a county / city basis (i.e. somewhat related to the actual local wages), see also https://www.dol.gov/whd/immigration/h1b.htm https://www.dol.gov/whd/immigration/h1b.htm