Global atmospheric electrical parameters like atmospheric conductivity, air-earth current density, electric field, and atmospheric potential have been estimated over different places of United States (US) assuming fair weather conditions. Results show that atmospheric electrical conductivity and current density increase with height from sea level, while electric field remains constant at all altitudes. The atmospheric potential, on the other hand, decreases in US orography. New best fit regression lines between the atmospheric electrical parameters and height from sea level have been examined for US orography in both clean and clear atmosphere.