It's hard to determine which family is higher than another and some are a toss-up, but anyways this is what I came up with:

1. Detroit family - Zerelli era (Commission seat + very strong union ties)
2. Magadinno family - Old man's era (Commission seat + very large territory)
3. Philly family - Bruno's era (Commission seat)
4. New Orleans family - Marcello's era (Huge territory + national importance)
5. Trafficante family - Santo jr's era (Very affluent + national importance)
6. New England family - Patriarca's era (Strong leader + very stable organization)
7. Cleveland family - Scalish era (strong presence in Las Vegas)
8. KC family - Civella era (strong presence in Las Vegas)
9. Pittsburgh family - LaRocca's era (Big territory, but not very significant on national level)
10. Bufalino family - Russell's era (Wealthy family but small in size)