Electrical measurements using AC immittance spectroscopic technique over the temperature range of 25-300degreesC, on sintered compacts of pure BaZrO3 and those containing 5 wt.% BaSnO3 sintered in the temperature range of 1600-1700degreesC for up to 12 h are reported. Data BaSnO3 analyses revealed that the capacitance and the derived dielectric constant remained invariant over more than three decades of frequency in the kilo to megahertz regime. Typically, the average dielectric constant was 15 and the TCK values were P3 and P186 ppm/degreesC for pure and 5 wt.% BaSnO3-added BaZrO3, respectively, in the range 25-300degreesC.