The mass spectra of D meson states are calculated in the framework of a relativistic independent quark model. For the present study, we have used the martin like potential for the quark confinement. Our predicted states in S-wave, 2 ^3S_1 (2605.86 MeV) and 2 ^1S_0 (2521.72 MeV) are in very good agreement with experimental result of 2608±2.4±2.5 MeV and 2539.4±4.5±6.8 MeV respectively reported by BABAR Collaboration. The calculated P-wave D meson states, 1^3P_2 (2468.22 MeV), 1^3P_1 (2404.94

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... , 1^3P_0 (2315.24 MeV) and 1^1P_1 (2367.94 MeV) are in close agreement with experimental average (Particle Data Group) values of 2462.6 ± 0.7 MeV, 2427 ± 26 ± 25 MeV, 2318 ± 29 MeV and 2421.3 ± 0.6 MeV respectively. The pseudoscalar decay constant (f_P= 202.57 MeV) of D meson obtained using this relativistic formalism is in very good agreement with the experiment as well as with the lattice and other available theoretical predictions. The Cabibbo favoured hadronic decay branching ratios, BR(D^0→ K^- π^+) as 3.835 % and BR (D^0→ K^+ π^-) as 1.069 × 10^-4 are also in very good agreement with the respective experimental values of 3.91 ± 0.08% and (1.48± 0.07) × 10^-4 reported by CLEO Collaboration. Our predicted results in leptonic decay widths of D meson are also in better accord with experiment as well as other theoretical results. The mixing parameters of D^0 - D̅^0 oscillation, x_q (5.14 × 10^-3), y_q (6.02 × 10^-3) and R_M (3.13 × 10^-5) are in very good agreement with BaBar and Belle Collaboration results.