What are the average Elo and USCF ratings? I'm not sure if there exists an average, but what could be considered an average rating range in these systems?
I took the following data from the September 2013 Golden Database1 and "active" players are players with a USCF membership expiration date later than January 1, 20132.  All ratings are regular ratings.  Note that players have an established rating after completing 25 games.

USCF Active Players

Established Ratings

46,574 Players
1315.99 Mean Rating
1390 Median Rating


Provisional Ratings

33,692 Players
537.09 Mean Rating
410 Median Rating


All USCF Rated Players

Established Ratings

252,989 Players
1165.77 Mean Rating
1148 Median Rating


Provisional Ratings

303,153 Players
631.46 Mean Rating
576 Median Rating


Distribution of active, established USCF ratings



Note that unrated players were discarded and that no checks were done on the data (duplicate entries, placeholders, etc.).

Distribution of ratings by age



This image comes from the uschess forums.

1: The Golden Database is a database provided to USCF affiliates and TD's that includes the names, ratings, and expiration dates.  It can be downloaded from the USCF website
2: I picked January 1, 2013 as an arbitrary cutoff date.  If there's a better and easy check for whether or not a player is active I'm happy to add additional data or update these stats.