Are there areas in the US that can be looked at for reference?

Many places in the UK, continental Europe and Russia look very much complete and well though-out. (Some, I hate to say, even look overdone, but that's nothing that better rendering stylesheets cannot resolve; more data is almost unquestionably better than less). These places are often linked for reference when questions are answered.

Is there similarly a state or an area in the US that someone considers very well mapped, either due to one's own efforts or just as a matter of fact? I am interested in two levels of goodness:

1. Good mapping and tagging of admin borders and places from counties (parishes elsewhere) to cities to suburbs.
2. Good mapping of cities, complete with landuse, neighborhoods, proper classification of roads, access, POIs, etc.?

For one, I think Southern California is a god-awful mess. But I will not set out fixing it until I can visualize what it is supposed to look like. Seeing someone's successful effort elsewhere would help.

Please link as many places that fit or approach your standard of "goodness" as you wish, I don't think there will be wrong or unappreciated answers.