Rosemont Area Code

Rosemont, CA is served by area code 916. 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 916 is part of an overlay complex (279/916), 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	Rosemont, CA
Area Code	916
Overlay Complex	279/916
State	California
Country	United State
Time Zone	Pacific Standard Time (PST)
Code Type	General Purpose Code
In Service	Yes
Assignment Date	01-JAN-47
In Service Date	01-JAN-47

Rosemont, IL is served by area code 847. This area code was initially assigned on 27-JUL-95 and has been in continuous service since 20-JAN-96, supporting the city's growing communication needs over the years.

The area code 847 is part of an overlay complex (224/847), 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	Rosemont, IL
Area Code	847
Overlay Complex	224/847
State	Illinois
Country	United State
Time Zone	Central Standard Time (CST)
Code Type	General Purpose Code
In Service	Yes
Assignment Date	27-JUL-95
In Service Date	20-JAN-96

Rosemont, MD is served by area code 301. 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 301 is part of an overlay complex (240/227/301), 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	Rosemont, MD
Area Code	301
Overlay Complex	240/227/301
State	Maryland
Country	United State
Time Zone	Eastern Standard Time (EST)
Code Type	General Purpose Code
In Service	Yes
Assignment Date	01-JAN-47
In Service Date	01-JAN-47