There are 223 13-letter words that start with 'de'.
Note: These 223 13-letter words that start with 'de' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with dec, des, def, dem, dep, del, det, den, dea, dev, der, deb, deg, dee, dei, dew, deh, deo, deu, ded, dex, dek, dej, dez, dey.
3-letter words start with 'de' (9)