We report the analysis of resistivity in the ferromagnetic and paramagnetic state of La1-x K (x) MnO3 (x = 0.05, 0.10 and 0.15). The phonon frequencies are estimated from the ab initio theory with calibrated Hamiltonian for the atomic interaction between a pair such as Mn-O and La/K-O including van der Walls interaction. The modified electron-phonon (acoustic and optic) scattering incorporating the statistical factor and electron-electron and electron-magnon interactions is effective to describe the resistivity behaviour for a temperatures less than the metal-insulator transition (T (P)) in the ferromagnetic state of La1-x K (x) MnO3 (x = 0.05, 0.10 and 0.15). The Mott-Ioffe-Regel criterion for metallic conductivity is valid, and k(F)l similar to 1, epsilon (F) tau similar to 1. Paramagnetic semiconducting resistivity is consistent with small polaron conduction model, and variable-range hopping is inappropriate for the description of resistivity behaviour in a high-temperature region, T > T (P). The results suggest that disorder-induced localisation of charge carriers dominates electrical transport.