331 Area Code

Aurora, Illinois

Aurora, Illinois is the largest city covered by the 331 Area Code

Current Time

Central Time Zone

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331 Area Code Overview & Map

The 331 area code is primarily associated with the state of Illinois in the United States. It is an overlay area code that was added to the same geographic region served by the 630 area code. Overlay codes are introduced when the demand for telephone numbers exceeds the available supply within a particular area. In the case of the 331 area code, it covers parts of the Chicago metropolitan area and its surrounding suburbs.

When was the 331 Area Code created?

The 331 area code was first put into service in 2007, by the North American Numbering Plan Administration (NANPA). Learn more about the US Area Code System

History

The 331 area code was created from the 630 area code, to meet the growing demand for new telephone numbers in Illinois.

Where is the 331 Area Code located?

The 331 area code serves Aurora, Illinois and the surrounding areas.

Overlays

The 331 is an overlay for the 630 area code(s), and serves the same area. Learn about overlays

331 Area Code Map

331 Area Code Map

Cities in the 331 Area Code

The 331 area code includes 61 cites in Illinois.

City Population % in Area Code
Aurora, IL 197,899 100%
Joliet, IL 147,433 6%
Naperville, IL 141,853 100%
Bolingbrook, IL 73,366 91%
Wheaton, IL 52,894 100%
Downers Grove, IL 47,833 100%
Elmhurst, IL 44,121 100%
Lombard, IL 43,165 100%
Bartlett, IL 41,208 94%
Streamwood, IL 39,858 97%
Carol Stream, IL 39,711 100%
Romeoville, IL 39,680 9%
Plainfield, IL 39,581 20%
Hanover Park, IL 37,973 100%
Addison, IL 36,942 100%
Glendale Heights, IL 34,208 100%
St. Charles, IL 32,974 100%
Woodridge, IL 32,971 100%
Oswego, IL 30,355 100%
Glen Ellyn, IL 27,450 100%
West Chicago, IL 27,086 100%
Batavia, IL 26,045 100%
Westmont, IL 24,685 100%
Roselle, IL 22,763 100%
Lisle, IL 22,390 100%
Darien, IL 22,086 100%
Bloomingdale, IL 22,018 100%
Villa Park, IL 21,904 100%
Geneva, IL 21,495 100%
Montgomery, IL 18,438 100%
Bensenville, IL 18,352 99%
Yorkville, IL 16,921 96%
Hinsdale, IL 16,816 98%
North Aurora, IL 16,760 100%
Lemont, IL 16,000 100%
Wood Dale, IL 13,770 100%
Warrenville, IL 13,140 100%
Campton Hills, IL 11,131 82%
Plano, IL 10,856 100%
Burr Ridge, IL 10,559 99%
Winfield, IL 9,080 100%
Sugar Grove, IL 8,997 100%
Itasca, IL 8,649 100%
Willowbrook, IL 8,540 100%
Clarendon Hills, IL 8,427 100%
Boulder Hill, IL 8,108 100%
Oak Brook, IL 7,883 99%
Sandwich, IL 7,421 19%
Elburn, IL 5,602 100%
Willow Springs, IL 5,524 9%
Palos Park, IL 4,847 8%
Indian Head Park, IL 3,809 9%
Wayne, IL 2,431 99%
Oakbrook Terrace, IL 2,134 100%
Prestbury, IL 1,722 100%
Maple Park, IL 1,310 7%
Big Rock, IL 1,126 100%
Lily Lake, IL 993 100%
Kaneville, IL 484 100%
Millbrook, IL 335 67%
Virgil, IL 329 100%

331 Area Code NXX Prefixes

The 331 Area Code (NPA Code) has 192 prefixes (NXX Code). An NXX prefix, also known as a central office code or exchange code, is the three-digit code that follows the area code in a North American telephone number. Learn about NXX Prefixes

Area Code Prefix Usage Carrier Rate Center
331 200 Landline T-Mobile USA, Inc. Bartlett
331 201 Wireless Cellco Partnership DBA Verizon Wireless - Il Downersgrv
331 202 Landline Sprint Spectrum, L.p. Elmhurst
331 203 Landline Sprint Spectrum, L.p. Aurora
331 204 Landline Onvoy, LLC Naperville
331 205 Landline T-Mobile USA, Inc. Aurora
331 206 Landline Sprint Spectrum, L.p. Aurora
331 207 Landline Level 3 Communications, LLC - Il Yorkville
331 208 Landline Sprint Spectrum, L.p. Aurora
331 209 Landline Level 3 Communications, LLC - Il Elmhurst
331 210 Landline Peerless Network Of Illinois, LLC - Il St Charles
331 212 Landline Mcimetro Access Transmission Services LLC - Il Aurora
331 213 Wireless Cellco Partnership DBA Verizon Wireless - Il Naperville
331 214 Wireless Cellco Partnership DBA Verizon Wireless - Il Downersgrv
331 215 Wireless Cellco Partnership DBA Verizon Wireless - Il Naperville
331 216 Wireless New Cingular Wireless Pcs, LLC - Il Oswego
331 218 Landline T-Mobile USA, Inc. Wheaton
331 219 Landline Telnyx LLC Aurora
331 220 Landline Sprint Spectrum, L.p. Aurora
331 221 Landline Illinois Bell Tel Co Elmhurst
331 222 Wireless New Cingular Wireless Pcs, LLC - Il St Charles
331 223 Wireless New Cingular Wireless Pcs, LLC - Il St Charles
331 225 Landline Sprint Spectrum, L.p. Elmhurst
331 226 Landline T-Mobile USA, Inc. Naperville
331 227 Wireless Cellco Partnership DBA Verizon Wireless - Il Sugargrove
331 228 Landline Ovation Communications Of Illinois, Inc. St Charles
331 229 Wireless Cellco Partnership DBA Verizon Wireless - Il Naperville
331 230 Landline T-Mobile USA, Inc. Aurora
331 231 Wireless New Cingular Wireless Pcs, LLC - Il Naperville
331 232 Wireless New Cingular Wireless Pcs, LLC - Il W Chicago
331 233 Landline Telnyx LLC Downersgrv
331 234 Wireless Cellco Partnership DBA Verizon Wireless - Il Sugargrove
331 235 Wireless New Cingular Wireless Pcs, LLC - Il St Charles
331 236 Landline T-Mobile USA, Inc. Wheaton
331 237 Landline Mcimetro Access Transmission Services LLC - Il Naperville
331 238 Landline Teleport Communications America, LLC - Il Downersgrv
331 239 Landline Onvoy, LLC Yorkville
331 240 Landline Peerless Network Of Illinois, LLC - Il W Chicago
331 241 Landline Onvoy, LLC Lombard
331 242 Landline T-Mobile USA, Inc. Lombard
331 243 Landline T-Mobile USA, Inc. Lombard
331 244 Landline Onvoy, LLC Naperville
331 245 Landline T-Mobile USA, Inc. Bartlett
331 246 Landline T-Mobile USA, Inc. Lemont
331 247 Landline Vonage America LLC Naperville
331 248 Landline Comcast Ip Phone, LLC Geneva
331 249 Landline Onvoy, LLC Naperville
331 250 Landline T-Mobile USA, Inc. Aurora
331 251 Wireless Cellco Partnership DBA Verizon Wireless - Il Downersgrv
331 252 Landline Teleport Communications America, LLC - Il Warrenville
331 253 Landline T-Mobile USA, Inc. Lemont
331 254 Landline T-Mobile USA, Inc. Sugargrove
331 255 Landline Onvoy, LLC Aurora
331 256 Wireless Cellco Partnership DBA Verizon Wireless - Il Aurora
331 257 Wireless New Cingular Wireless Pcs, LLC - Il Aurora
331 258 Landline Onvoy, LLC Aurora
331 259 Landline Peerless Network Of Illinois, LLC - Il Sugargrove
331 260 Landline Teleport Communications America, LLC - Il Downersgrv
331 261 Landline T-Mobile USA, Inc. Lemont
331 262 Landline Sprint Spectrum, L.p. Aurora
331 263 Landline Onvoy, LLC Itasca
331 264 Landline Level 3 Communications, LLC - Il Hinsdale
331 265 Landline Onvoy, LLC Geneva
331 266 Wireless New Cingular Wireless Pcs, LLC - Il St Charles
331 267 Landline Vonage America LLC Lombard
331 268 Landline T-Mobile USA, Inc. Sugargrove
331 269 Landline T-Mobile USA, Inc. Aurora
331 270 Landline Onvoy, LLC Aurora
331 271 Landline Onvoy, LLC Hinsdale
331 272 Landline Onvoy, LLC St Charles
331 273 Landline Onvoy, LLC Lemont
331 274 Landline T-Mobile USA, Inc. Aurora
331 275 Landline T-Mobile USA, Inc. Bartlett
331 276 Wireless Cellco Partnership DBA Verizon Wireless - Il St Charles
331 277 Wireless New Cingular Wireless Pcs, LLC - Il Lombard
331 278 Wireless New Cingular Wireless Pcs, LLC - Il Aurora
331 279 Landline Paetec Communications, Inc. - Il Elmhurst
331 280 Wireless Cellco Partnership DBA Verizon Wireless - Il Downersgrv
331 281 Landline Illinois Bell Tel Co Naperville
331 282 Landline Onvoy, LLC Hinsdale
331 283 Landline T-Mobile USA, Inc. Geneva
331 284 Landline T-Mobile USA, Inc. Bartlett
331 285 Wireless Cellco Partnership DBA Verizon Wireless - Il Naperville
331 286 Wireless Cellco Partnership DBA Verizon Wireless - Il St Charles
331 287 Landline Bandwidth.com Clec, LLC - Il Aurora
331 288 Landline Ton80 Communications, LLC Elburn
331 289 Landline T-Mobile USA, Inc. Hinsdale
331 290 Wireless Cellco Partnership DBA Verizon Wireless - Il Aurora
331 291 Wireless Cellco Partnership DBA Verizon Wireless - Il Downersgrv
331 292 Landline Onvoy Spectrum, LLC Downersgrv
331 293 Wireless New Cingular Wireless Pcs, LLC - Il Aurora
331 294 Wireless Cellco Partnership DBA Verizon Wireless - Il Naperville
331 295 Landline Nuso, LLC Aurora
331 299 Landline Fractel, LLC Hinsdale
331 300 Landline T-Mobile USA, Inc. Aurora
331 301 Landline Metropcs, Inc. Aurora
331 302 Wireless Cellco Partnership DBA Verizon Wireless - Il Aurora
331 303 Landline Bandwidth.com Clec, LLC - Il Elburn
331 304 Landline T-Mobile USA, Inc. Bartlett
331 305 Wireless Cellco Partnership DBA Verizon Wireless - Il Naperville
331 307 Landline T-Mobile USA, Inc. Lombard
331 308 Landline Bandwidth.com Clec, LLC - Il Bartlett
331 310 Landline Bandwidth.com Clec, LLC - Il Big Rock
331 313 Landline Onvoy Spectrum, LLC Naperville
331 315 Wireless New Cingular Wireless Pcs, LLC - Il Lombard
331 318 Landline Bandwidth.com Clec, LLC - Il Lemont
331 321 Landline T-Mobile USA, Inc. Aurora
331 330 Wireless New Cingular Wireless Pcs, LLC - Il Naperville
331 332 Wireless New Cingular Wireless Pcs, LLC - Il Naperville
331 333 Wireless New Cingular Wireless Pcs, LLC - Il Naperville
331 334 Landline Onvoy, LLC Batavia
331 336 Landline Fractel, LLC Aurora
331 341 Landline Radiantiq LLC Plano
331 343 Landline Onvoy, LLC Downersgrv
331 345 Landline Fractel, LLC Naperville
331 348 Landline Fractel, LLC Elburn
331 356 Landline Fractel, LLC Bartlett
331 373 Landline Ton80 Communications, LLC Oswego
331 385 Wireless New Cingular Wireless Pcs, LLC - Il Aurora
331 388 Landline Fractel, LLC Sugargrove
331 399 Landline Fractel, LLC Downersgrv
331 400 Landline Fractel, LLC Oswego
331 401 Landline Level 3 Communications, LLC - Il Naperville
331 422 Landline Level 3 Communications, LLC - Il St Charles
331 425 Landline T-Mobile USA, Inc. Aurora
331 426 Landline Ton80 Communications, LLC Lemont
331 431 Landline Bandwidth.com Clec, LLC - Il Aurora
331 442 Wireless Cellco Partnership DBA Verizon Wireless - Il St Charles
331 444 Wireless Cellco Partnership DBA Verizon Wireless - Il Naperville
331 452 Wireless Cellco Partnership DBA Verizon Wireless - Il Aurora
331 454 Wireless New Cingular Wireless Pcs, LLC - Il Aurora
331 456 Landline First Communications, LLC - Il Roselle
331 457 Wireless Cellco Partnership DBA Verizon Wireless - Il Naperville
331 462 Landline Xo Illinois, Inc. Lombard
331 465 Wireless New Cingular Wireless Pcs, LLC - Il W Chicago
331 466 Landline Ton80 Communications, LLC Glen Ellyn
331 472 Landline T-Mobile USA, Inc. Naperville
331 481 Wireless Cellco Partnership DBA Verizon Wireless - Il Downersgrv
331 500 Landline Fractel, LLC Geneva
331 529 Landline Fractel, LLC Naperville
331 551 Wireless New Cingular Wireless Pcs, LLC - Il Lombard
331 575 Landline Sprint Spectrum, L.p. Aurora
331 588 Wireless New Cingular Wireless Pcs, LLC - Il St Charles
331 600 Landline Fractel, LLC Wheaton
331 625 Wireless Cellco Partnership DBA Verizon Wireless - Il Downersgrv
331 627 Landline Ton80 Communications, LLC Lombard
331 631 Landline Onvoy Spectrum, LLC Downersgrv
331 642 Landline Bandwidth.com Clec, LLC - Il Elmhurst
331 643 Landline Sprint Spectrum, L.p. Aurora
331 645 Landline Sprint Spectrum, L.p. Elmhurst
331 666 Landline Onvoy, LLC Aurora
331 684 Landline Rcn Telecom Services Of Illinios, Inc. - Il Aurora
331 688 Landline Ton80 Communications, LLC Naperville
331 701 Wireless Cellco Partnership DBA Verizon Wireless - Il Naperville
331 702 Landline Mcimetro Access Transmission Services LLC - Il Naperville
331 703 Landline T-Mobile USA, Inc. W Chicago
331 704 Landline Bandwidth.com Clec, LLC - Il Kaneville
331 707 Landline T-Mobile USA, Inc. Aurora
331 716 Landline Onvoy, LLC Wheaton
331 717 Wireless New Cingular Wireless Pcs, LLC - Il Oswego
331 725 Wireless New Cingular Wireless Pcs, LLC - Il Oswego
331 732 Landline Fractel, LLC Geneva
331 746 Landline Ton80 Communications, LLC Kaneville
331 757 Landline T-Mobile USA, Inc. Lemont
331 758 Landline Fractel, LLC Aurora
331 771 Landline Onvoy, LLC St Charles
331 775 Landline Comcast Ip Phone, LLC Downersgrv
331 777 Wireless Cellco Partnership DBA Verizon Wireless - Il Downersgrv
331 788 Landline Fractel, LLC Geneva
331 800 Landline Onvoy, LLC W Chicago
331 801 Landline Teleport Communications America, LLC - Il Downersgrv
331 803 Landline Peerless Network Of Illinois, LLC - Il Lemont
331 806 Landline Comcast Ip Phone, LLC Wheaton
331 808 Landline Bandwidth.com Clec, LLC - Il Plano
331 814 Landline T-Mobile USA, Inc. Naperville
331 825 Landline Digital Network Access Communications, Inc. - Il Geneva
331 826 Landline Sprint Spectrum, L.p. Elmhurst
331 837 Landline Ton80 Communications, LLC W Chicago
331 850 Landline Radiantiq LLC Big Rock
331 866 Landline Ton80 Communications, LLC Wheaton
331 867 Landline Fractel, LLC Yorkville
331 871 Landline Onvoy, LLC W Chicago
331 888 Landline Peerless Network Of Illinois, LLC - Il Warrenville
331 899 Landline Fractel, LLC Lombard
331 900 Landline Fractel, LLC Elmhurst
331 901 Landline Bandwidth.com Clec, LLC - Il St Charles
331 903 Landline AT&T Corp. Downersgrv
331 946 Landline Fractel, LLC Glen Ellyn
331 979 Landline Comcast Ip Phone, LLC Elmhurst
331 980 Landline T-Mobile USA, Inc. Aurora
331 998 Wireless Cellco Partnership DBA Verizon Wireless - Il Downersgrv
331 999 Landline Bandwidth.com Clec, LLC - Il Oswego