Demographics and Climate of Jefferson County

Jefferson County (Jeffco) is located on the western edge of metropolitan Denver and offers a diversified geographical setting from urban and rural lifestyles, to thriving mountain communities in the majestic Rocky Mountains. Just minutes from downtown Denver, Jefferson County enjoys easy access to all major aerial highways. Jefferson County is the state’s second most populated county and is home to one-in-eight Colorado residents.

At a glance, Jefferson County is comprised of 773 square miles

POPULATION: 532,723 with approximately 210,000 households



Days of sunshine: 252 days

Annual snowfall: 60.3 inches

Annual precipitation: 15.4 inches

Hottest month July – average temp 74

Coldest Month January – average temp 30

The region is based upon its geographic identity, which can best be describes as west of the Mile High City and close to the foothills. With a friendly business environment and an unmatched quality of life, Jefferson County is a premier tourist area.