The purpose of this study is to examine the physicochemical characteristics, total concentration, DTPA extractable, chemical classification, and depth variations of some heavy metals in the paddy soils of the Tarom region of the province of Zanjan. Lead, zinc, copper, and cadmium heavy metal concentrations with DTPA were found to be maximum in total and extractable concentrations at a depth of 0–20 cm, and their concentrations declined as depth increased. For the metals nickel, chromium, cobalt, manganese, and iron, this pattern is reversed, with the lowest concentration being associated with the surface layer and a rising concentration of these elements with depth. Moreover, the upper layer had higher concentrations of organic matter, CEC, clay, and silt than did the lower depths. Some features followed no particular trend, while others had a distinct trend. The elements that were extracted sequentially revealed that the largest contribution was related to the residual component (or associated with silicates), followed by the reducible component (or associated with iron and manganese oxides) in zinc and nickel and the exchangeable component (either soluble in acid or bound to carbonates) in lead. Furthermore, they were allocated the oxidizable component in copper (or the component connected to organic materials and sulfides). Based on the findings, it appears that the majority of the heavy metals under investigation have a natural origin. However, it cannot be argued that human activity has no effect on the increase in abundance of certain heavy metals, like as zinc, lead, and cadmium.