This study examines information and communication technologies (ICT) adoption among 3759 Colombian manufacturing firms to identify factors that are pertinent to the adoption and usage of ICT at the firm level. This article also attempts to ascertain if the determinants of a firm's ICT adoption vary across the firm size. Our major findings show that three main factors are complementary to a firm's ICT adoption: human capital, organizational changes, and innovation results. Also, firms facing competition in markets abroad are more likely to adopt ICT. Information spillover within the industry is also identified as a determinant of ICT adoptions by firms.