Thymus serpyllum L. collected from different localities of N.W.F.P. and Baluchistan were analysed for essential oils and phenol contents. It was observed that the change in plant locality had a remarkable effect on the yield of oil and phenol contents and had no effect on the physico-chemical characteristics of the oil. The leaves collected from various localities of Baluchistan contained more oil (1.45% to 2.64%) as compared to those of N.W.F.P. (0.35% to 0.75%). Plant material found kin Baluchistan can be commercially exploited in order to save the amount of foreign exchange spend on the various products of the said plants.