Jefferson County
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- Population
- 579,377
- Area
- 764.38 sq mi (1,979.74 km²), 9.68 sq mi water
- Median age
- 40.5
- Households
- 241,735
- Persons per household
- 2.4
- Median household income
- $110,656
- Median house value
- $637,600
Demographics: 2020–2024 ACS
Overnight
45°F
Mostly Clear1% precip
Sunday
73°F
Sunny8% precip
Sunday Night
50°F
Clear
Monday
77°F
Sunny4% precip
Cities & Towns in Jefferson County
Local News
City of Arvada
Published October 02
Movies Around Town: Nightmare Before Christmas
Catch a free showing of the movie and participate in our Halloween costume contest!
The Colorado Sun
Published October 01
What to do in Colorado this week: TED Talks in Breckenridge, Original Thinkers in Telluride and free music in Denver
Plus: Original Thinkers festival in Telluride, free music in Denver and a mural festival in Superior
City of Arvada
Published October 01
Info about Prop 123 hearing
At a business meeting on Oct. 6, 2026, Arvada City Council will consider changes to the Land Development Code that are needed to comply with Colorado Proposition 123, which provides funding for affordable housing projects.
The Colorado Sun
Published September 30
Black teen who says white peers wrote “slave auction” in school bathroom sues Lakewood charter school
The plaintiff says school leader told him to “hit, punch or slug” the bullies
City of Wheat Ridge
Published September 29