The best way to figure out what your USCF rating would be is to play some OTB tournaments :). Find a club near you, its not that scary I promise.
USCF comparison with chess.com ratings
apart from the differences noted above, I believe they use the glicko (spelling?) rating equation.
Just a clarification here: USCF doesn't use Glicko. There is no time-dependency (RD factor) in the USCF rating system.
Yes, USCF does not use glicko. If they did, chess.com and USCF would be pretty close. USCF does have a feature for new players called provisional ratings though, where the rating does fluctuate a lot.
It's true that your CC rating doesn't directly predict your USCF rating, or vice versa, but it's silly to say they aren't correlated. As discussed in other threads, CC turn-based ratings tend to run ~300 points higher than USCF, give or take. There are exceptions but that's the trend.
(My USCF: 1531, CC: 1890)
Are we assuming people are taking their time in correspondence though? Or just playing as fast as they would in bullet lol.
How to have a USCF rating?
Easy. Play in USCF tournaments.
http://main.uschess.org/index.php?option=com_wrapper&Itemid=199
there is a big I do not care factor. I do better when the pressure is on so in USCF I play better