We observe magnetic trapping of atomic nitrogen ((^{14})N) and cotrapping of ground state imidogen ((^{14})NH, (X)(^{3})(\Sigma) -). Both are loaded directly from a room temperature beam via buffer gas cooling. We trap approximately 1 x 10(^{11}) (^{14})N atoms at a peak density of 5 x 10(^{11}) cm(^{-3}) at 550 mK. The (12\pm{4} s 1/e) lifetime of atomic nitrogen in the trap is limited by elastic collisions with the helium buffer gas. Cotrapping of (^{14})N and (^{14})NH is accomplished, with 10(^{8}) NH trapped molecules at a peak density of 10(^{8}) cm(^{-3}).
