 Chillum is unincoporated and does not have its own zipcode; therefore it relies on its neighboring city of Hyattsville for its postal addresses/ zipcodes.While a vast majority of the residents living in/ businesses located in Chillum, MD are assigned the Hyattsville postal zipcodes of either 20782, or 20783, there are a few residents living on the far west side of Chillum/ businesses located very close to New Hampshire Avenue (MD 650) and the Prince George's/ Montgomery County Line, bordering the city of Takoma Park, MD, are assigned the Takoma Park, MD zipcode of 20912.Residents of Chillum that are assigned Takoma Park's 20912 zipcode have Takoma Park addresses though they are not even located within Takoma Park's boundaries.