Jefferson County CO United States
| County FIPS | 08059 |
| Largest City | Lakewood |
| State | Colorado |
| Latitude | 39.5864 |
| Longitude | -105.2505 |
| Population | 579,377 |
| Density | 758.16 people per square mile |
| Time Zone | America/Denver |
Median household: $110,656
Median individual: $56,165
Mode: 79.5% White
Median house value: $637,312.0
Median: 40.5 years old
With at least college degree: 52.0%
With STEM degree: 50.7%
Never married: 31.6%
Unemployed: 3.9%
All data comes from the SimpleMaps US Counties Database, 2026.
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