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Boulder Hill, IL Area Codes
Boulder Hill, Illinois (population 9,127) uses area codes 331 and 630.
Boulder Hill has no telephone exchange of its own in NANPA records; it is served by the Oswego exchange about 3 km away.
Carriers with Boulder Hill numbers
13 prefixes are assigned to the Oswego exchange: 31% mobile, 23% VoIP and cable, 46% landline.
| Carrier | Prefixes |
|---|---|
| AT&T Mobility | 4 |
| AT&T (Illinois Bell) | 2 |
| First Communications | 2 |
| Ton80 Communications | 1 |
| Fractel | 1 |
| Bandwidth | 1 |
| Verizon Business (MCImetro) | 1 |
| Lumen (Level 3) | 1 |
Area codes used in Boulder Hill
| Area code | Prefixes serving Boulder Hill | Main carriers in this code |
|---|---|---|
| 331 | 7 | Onvoy (Sinch), T-Mobile, Verizon Wireless |
| 630 | 6 | AT&T (Illinois Bell), AT&T Mobility, T-Mobile |
Boulder Hill phone number prefixes
Numbers starting with these first six digits were originally assigned to the Oswego exchange.
331-216AT&T Mobility331-337AT&T Mobility331-373Ton80 Communications331-400Fractel331-717AT&T Mobility331-725AT&T Mobility331-999Bandwidth630-383Verizon Business (MCImetro)630-551AT&T (Illinois Bell)630-554AT&T (Illinois Bell)630-608Lumen (Level 3)630-630First Communications630-636First Communications
Nearby cities in area code 331
- Aurora
- Naperville
- Schaumburg
- Bolingbrook
- Wheaton
- Downers Grove
- Elmhurst
- Lombard
- Bartlett
- Oswego
- Carol Stream
- Streamwood
Questions
- What is the area code for Boulder Hill, IL?
- Boulder Hill uses 2 area codes: 331 and 630. They overlay each other, so all of them cover the whole city and you dial 10 digits for local calls.
- What time zone is Boulder Hill in?
- Boulder Hill is in the Central time zone.