São Tomé & Príncipe Business Directory: STP is the ISO 3 alphabet country code of São Tomé & Príncipe. Currency of São Tomé & Príncipe is Db, which has a short code of STD. Capital of São Tomé & Príncipe is Sao Tome. São Tomé & Príncipe has the population of 208818 and approximate area is 964.00 square kilometers (or approx. 599.0296 square miles). Population density of São Tomé & Príncipe is approx. 216/Km2 (or approx. 134.2224/mile2)