720 Area Code: Denver's Modern Overlay Number

As Denver's population surged in the late 1990s, the original 303 area code could no longer keep pace with demand. 720 launched in 1998 as an overlay, and has since become the default code for most new lines across the metro.

History & Coverage

720 covers the same geographic footprint as 303 — Denver and the Front Range — as an overlay rather than a geographic split, meaning the two codes serve identical areas.

Why Businesses Choose 720

• Availability advantage: because 303 numbers are largely exhausted, 720 offers far more choice for businesses wanting a specific, memorable number
• Contemporary Denver association: most numbers issued since the early 2000s carry 720, making it the code younger customers and employees expect
• Tech and startup growth: Denver's fast-growing startup scene has increasingly adopted 720 for new business lines

Key Industries & Neighborhoods

RiNo, LoDo, and the Denver Tech Center anchor the city's growing tech, brewery, and creative economy, much of it now issued under 720 numbers due to 303 scarcity.

Fun Facts

• 720 was one of the first overlay codes introduced in the Mountain West, reflecting Denver's rapid growth in the late 1990s
• Denver has been consistently ranked among the fastest-growing large metros in the US over the past two decades

Conclusion

For businesses launching in Denver today, 720 offers the same metro credibility as 303 with significantly more availability for a strong, memorable number.