Shallow N donors in n-type 4H-SiC were studied by electron paramagnetic resonance (EPR) and electron nuclear double resonance (ENDOR). For the N donor at the cubic site (N-k) in 4H-SiC, the hyperfine (hf) constants of the interaction with the nearest neighbour (NN) Si-29 atom along the c axis were determined as A(∥) = 41.07 MHz and A(⊥) = 41.31 MHz. For other three NN Si atoms in the basal plane, the hf tensor has C-1h symmetry and the principal values A(xx) = 5.94 MHz, A(yy) = 5.06 MHz and A(zz) = 14.25 MHz. Our EPR and ENDOR observations unambiguously confirm that the N donor occupies the C site in 4H-SiC lattice and also reveal a considerable amount of the spin density of N-k (∼ 23.9 %) which was not obtained in previous studies.