Boulder Area Code

Boulder, CO is served by area code 303. This area code was initially assigned on 01-JAN-47 and has been in continuous service since 01-JAN-47, supporting the city's growing communication needs over the years.

The area code 303 is part of an overlay complex (303/720/983), which serves the same geographic region. This means that multiple area codes are used in the same area to accommodate the increasing demand for phone numbers.

City Name	Boulder, CO
Area Code	303
Overlay Complex	303/720/983
State	Colorado
Country	United State
Time Zone	Mountain Standard Time (MST)
Code Type	General Purpose Code
In Service	Yes
Assignment Date	01-JAN-47
In Service Date	01-JAN-47

Boulder, UT is served by area code 435. This area code was initially assigned on 30-MAY-97 and has been in continuous service since 21-SEP-97, supporting the city's growing communication needs over the years.

City Name	Boulder, UT
Area Code	435
State	Utah
Country	United State
Time Zone	Mountain Standard Time (MST)
Code Type	General Purpose Code
In Service	Yes
Assignment Date	30-MAY-97
In Service Date	21-SEP-97

Boulder, WY is served by area code 307. This area code was initially assigned on 01-JAN-47 and has been in continuous service since 01-JAN-47, supporting the city's growing communication needs over the years.

City Name	Boulder, WY
Area Code	307
State	Wyoming
Country	United State
Time Zone	Mountain Standard Time (MST)
Code Type	General Purpose Code
In Service	Yes
Assignment Date	01-JAN-47
In Service Date	01-JAN-47

Boulder, MT is served by area code 406. This area code was initially assigned on 01-JAN-47 and has been in continuous service since 01-JAN-47, supporting the city's growing communication needs over the years.

City Name	Boulder, MT
Area Code	406
State	Montana
Country	United State
Time Zone	Mountain Standard Time (MST)
Code Type	General Purpose Code
In Service	Yes
Assignment Date	01-JAN-47
In Service Date	01-JAN-47