Out of 184 U.S. cities with more than 50,000 households, NDIA's release lists the 25 worst-connected in terms of
- percent of all households in 2014 with no home Internet access of any kind
- percent of households with incomes below $35,000 that lacked Internet subscriptions (including dial-up or mobile).
Here's a handy map...
This is only the second time the Census has published household Internet numbers, and the exact percentages and rankings for 2014 vary somewhat from the 2013 list, reflecting the fact that ACS data is based on random surveys and always shows some year-to-year inconsistency. But overall, the two lists are pretty similar.