Conifer is an unincorporated community in Jefferson County, Colorado, United States. Conifer is located along U.S. Route 285 in the foothills west of Denver. A post office called Conifer was established in 1894. Some say the community was named after George Conifer, the proprietor of a local tavern, while others believe conifer trees near the original town site c…Conifer is an unincorporated community in Jefferson County, Colorado, United States. Conifer is located along U.S. Route 285 in the foothills west of Denver. A post office called Conifer was established in 1894. Some say the community was named after George Conifer, the proprietor of a local tavern, while others believe conifer trees near the original town site caused the name to be selected.