> Having a US representative for every 30k residents would, in many cases, result in congressional districts that are smaller than currently existing State legislative districts.

That's something of an understatement...Los Angeles (just the city proper, not the metro area) would have more members of the House of Representatives than there the total members of the California State Assembly and California State Senate combined. (133 vs. 120).

The other extreme would be New Hampshire, where we have just over 3000 residents per representative, and thus the third-largest legislature in the English-speaking world. Possibly one of the lowest-paid legislatures, as well - $100/year, plus gas money...