Electron paramagnetic resonance (EPR) data were obtained for Co(H2O)62+ and six Co(II) complexes with 0, 1, or 2 water molecules in the first coordination sphere. Continuous wave (CW) spectra confirmed that the complexes are high spin with zero-field splitting greater than the X-band EPR quantum. Two- and three-pulse electron spin echoes were recorded at about 6 K. The electron spin phase memory time, T(m), varied through the spectrum, with longer values observed at higher magnetic field. The electron spin lattice relaxation time, T1, measured by saturation recovery was approximately independent of position in the spectrum but was strongly temperature dependent. In D2O:glycerol-d3 solution, the depth of the deuteron modulation fell into two classes : complexes with directly bound water exhibited substantially deeper modulation than complexes without directly bound water. Fourier transforms of the two-pulse electron spin echo envelope,modulation in H2O:glycerol solution reveal frequencies near twice the proton Larmor frequency that distinguish between first and second coordination sphere water. Two complexes containing imidazole bound to Co(II) exhibit characteristic nitrogen modulation frequencies in Fourier transforms of 3-pulse ESEEM data.