In this study, 6 different carded yarns with 100% cotton, 95-5% cotton/hemp, and 85-15% cotton/hemp ratios were produced in Ne 20/1 and Ne 30/1 yarn counts and the thick-thin places, neps, unevenness, hairiness, breaking strength and elongation properties of the yarns were investigated. Later, knitted (single jersey) fabrics were produced on the same machine with these yarns. The effects of yarn count and hemp ratio on bursting strength, pilling resistance, and draping properties of knitted fabrics, as well as thermal resistance and water vapor permeability were investigated. According to the test results, as the yarn count increased, IPI values, and unevenness increased, and the hairiness and breaking strength values decreased. As the hemp ratio increased, IPI values, unevenness and hairiness increased, and the breaking strength and elongation decreased. When the average drape coefficient values of the knitted fabrics were examined, it was observed that the fabric drape decreased as the yarn count decreased. In addition, as the hemp ratio increased, fabric drape increased and hemp fibers had a positive effect on the drape of knitted fabrics. The bursting strength of knitted fabrics was affected by the breaking strength values of the yarns, and the bursting strength decreased as the hemp content increased. The pilling degree of 100 % cotton fabrics was discovered to be the lowest. When the yarn count increased, the water vapor permeability values increased. In addition, it was observed that when the hemp content in the fabrics increased, thermal resistance values increased partially and the water vapor permeability value decreased.