Aurora, IL Area Codes

Area codes serving Aurora

Aurora sits in Illinois, part of the Midwest region and the Central Time zone. Its numbers are spread across an overlay of 2 codes that all cover the same ground: 331, 630.

The original code is 630 (in service since 1996). As the area ran low on numbers, regulators added overlay codes on top instead of splitting the city, so longtime residents kept their numbers while new lines received a newer code.

Code	Area served	In service
331	Western Chicago suburbs in DuPage, Kane, Kendall and northern Will counties	October 7, 2007
630	Western Chicago suburbs in DuPage, Kane, Kendall and northern Will counties	August 3, 1996

Nearby cities sharing these area codes

• Naperville
• Bolingbrook
• Wheaton
• Downers Grove
• Elmhurst
• Lombard
• Carol Stream
• St. Charles
• Glendale Heights
• Oswego
• Batavia
• Woodridge
• Addison

How to pick an area code for a new number

When you activate a new line in Aurora, the carrier assigns whichever code has numbers available — you usually can't choose. If a specific code matters to you (for example the prestige of 630), ask the carrier whether any blocks remain, or request a number transfer. All codes here dial identically and cost the same.

Dialing in Aurora

Because Aurora is an overlay area, 10-digit dialing is mandatory: always dial the area code plus the seven-digit number, even for a neighbor. See 10-digit dialing and overlay area codes for the background. For every code in Illinois, visit the Illinois area codes page.