There are 468 13-letter words that start with 'co'.
Note: These 468 13-letter words that start with 'co' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with con, com, cor, col, cou, coc, cop, coa, cos, coo, coe, cod, cow, coi, cot, cov, cog, coh, cof, cob, cox, coz, coy, coq, cok, coj.
3-letter words start with 'co' (14)