More are urban than non-urban, so the national average isn't a particularly useful number either.
Here's a relevant page by the Bureau of Labor Statistics. If you scroll down a bit past the state-level charts, they start showing metropolitan areas. "San Jose-Sunnyvale-Santa Clara" has a fairly good compromise between volume and density, but it's not at the top of either chart.
Here's a relevant page by the Bureau of Labor Statistics. If you scroll down a bit past the state-level charts, they start showing metropolitan areas. "San Jose-Sunnyvale-Santa Clara" has a fairly good compromise between volume and density, but it's not at the top of either chart.
http://www.bls.gov/oes/current/oes151131.htm#st