Area code 720 covers the central part of Colorado, including Denver, Boulder, and Aurora. Area code 303 overlays the area, requiring 10-digit dialing.
- 720-207
- Landline Number
- Englewood, CO
- 720-222
- Landline Number
- Englewood, CO
- 720-285
- Landline Number
- Englewood, CO
- 720-336
- Landline Number
- Keenesburg, CO
- 720-344
- Landline Number
- Littleton, CO
- 720-348
- Landline Number
- Littleton, CO
- 720-367
- Landline Number
- Englewood, CO
- 720-368
- Landline Number
- Englewood, CO
- 720-386
- Landline Number
- Idaho Springs, CO
- 720-392
- Landline Number
- Deer Trail, CO
- 720-477
- Landline Number
- Henderson, CO
- 720-522
- Landline Number
- Englewood, CO
- 720-580
- Landline Number
- Keenesburg, CO
- 720-608
- Landline Number
- Idaho Springs, CO
- 720-683
- Landline Number
- Fort Lupton, CO
- 720-729
- Landline Number
- Keenesburg, CO
- 720-800
- Landline Number
- Henderson, CO
