i would like to know the names and trading symbols of all usa stock
companies that pay a dividend of 4% or more.

Hello.

Yahoo's Stock Screener [ http://screen.yahoo.com/stocks.html ]
indicates that there are 567 USA stocks (NYSE, AMEX, NASDAQ, OTC)
currently paying a dividend of 4% or more.

For Yahoo's list of the 567 stocks, use this link:
http://screen.yahoo.com/b?sc=&im=&prmin=&prmax=&avmin=&avmax=&mcmin=&mcmax=&dvymin=4&dvymax=&roy=&betamin=&betamax=&remin=&remax=&pmmin=&pmmax=&pemin=&pemax=&pbmin=&pbmax=&psmin=&psmax=&pegmin=&pegmax=&gr=&grfy=&ar=&vw=1&db=stocks

search strategy: "stock screener", dividend

I hope this helps.