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331 Area Code 🌍☎️

The 331 Area Code is located in the state of Illinois. Area Code 331 is one of the 269 three-digit telephone area codes in the USA. It covers roughly 1,979,966 unique phone numbers and 481,890 individuals near the cities of Aurora, Naperville, and Downers Grove.

Cities Located in the 331 Area Code

The most populous cities in area code 331 are: Aurora, Naperville, Downers Grove, Saint Charles, and Lombard.

Other cities in the 331 area code include: Elmhurst, Lemont, Geneva, Wheaton, Oswego, Bartlett, West Chicago, Sugar Grove, Elburn, Hinsdale, Yorkville, Glen Ellyn, Warrenville, Plano, Big Rock, Bensenville, Oak Brook, and Roselle.

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About Aurora, Naperville, and Downers Grove, Illinois

Aurora, a suburb of Chicago, is a city predominantly in Kane County and DuPage County, with portions extending into Kendall and Will counties. It is located in the outer region of Greater Chicago in the U.S. state of Illinois. It is the second most populous city in the state, and the 114th most populous city in the country. The population was 197,899 at the 2010 census, and was estimated to have increased to 199,963 by July 2013. Once a mid-sized manufacturing city, Aurora has grown tremendously since the 1960s. Founded within Kane County, Aurora's city limits and population have since expanded into DuPage, Will, and Kendall counties. Between 2000 and 2003, the U.S. Census Bureau ranked Aurora as the 34th fastest growing city in the United States. From 2000 to 2009, the U.S. Census Bureau ranked the city as the 46th fastest growing city with a population of over 100,000. In 1908, Aurora officially adopted the nickname "City of Lights", because it was one of the first cities in the United States to implement an all-electric street lighting system in 1881. Aurora's historic downtown is located on the Fox River, and centered on Stolp Island. The city is divided into three regions, The West Side, located on the west side of the Fox River, The East Side, located between the eastern bank of the Fox River and the Kane/DuPage County line, and the Far East Side/Fox Valley, which is from the County Line to the city's eastern border with Naperville.The Aurora area is home to an impressive collection of architecture, including structures by Frank Lloyd Wright, Ludwig Mies van der Rohe, Bruce Goff and George Grant Elmslie. The Hollywood Casino Aurora, a dockside gaming facility with 53,000 square feet (4,900 m 2) and 1,200 gaming positions, is located on the river in downtown Aurora. Aurora is also home to a large collection of Sears Catalog Homes (over 50 homes) and Lustron all-steel homes (seven homes).

Naperville is a city in DuPage and Will counties in the U.S. state of Illinois, and a suburb of Chicago. Naperville was voted the second-best place to live in the United States by Money magazine in 2006. It was rated 1st on the list of best cities for early retirement in 2013 by Kiplinger. In a 2010 study, Naperville was named the wealthiest city in the Midwest and eleventh in the nation with a population over 75,000. It was ranked among the nation's safest cities by USAToday and Business Insider. As of the 2010 census, the city had a population of 141,853, which was estimated to have increased to 147,100 by July 2015. It is the fifth-largest city in Illinois.

Downers Grove is a village in DuPage County, Illinois, United States. It was founded in 1832 by Pierce Downer, whose surname serves as the eponym for the village. Approximately 20 miles from the Loop, Downers Grove is a far south-western suburb of Chicago. The most recent census estimate tallied 49,715 residents in 2014.

What Time Zone is Area Code 331?

The 331 area code lies within the Central Daylight Time Zone (or CDT). The current time in Central Daylight Time is 07:03 AM on Jun 21, 2025.

Neighborhood Demographics

Statistics based on US Census data for Aurora
38 y/o
Median Age
The median age for Aurora was sourced from the US Census
$95.8K
Median Income
The median income for Aurora was sourced from the US Census
$328K
Median Home Value
The median home value for Aurora was sourced from the US Census
482K
Total Population
The total population for Aurora was sourced from the US Census

Area Codes Near Aurora, Naperville, and Downers Grove, Illinois

Area Code 630
7,839,151 phone numbers
Area Code 708
7,802,338 phone numbers
Area Code 779
2,899,977 phone numbers
Area Code 224
5,219,749 phone numbers
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634 Records Found

Phone Number Prefixes in the 331 Area Code

(331) 200
Neutral Tandem
Bartlett, IL
(331) 201
Verizon Wireless
Downers Grove, IL
(331) 202
MetroPCS
Elmhurst, IL
(331) 203
T-Mobile
Aurora, IL
(331) 204
Neutral Tandem
Naperville, IL
(331) 205
T-Mobile
Aurora, IL
(331) 206
T-Mobile
Aurora, IL
(331) 207
Bandwidth.com
Yorkville, IL
(331) 208
T-Mobile
Aurora, IL
(331) 209
Bandwidth.com
Elmhurst, IL
(331) 210
AT&T Mobility
Saint Charles, IL
(331) 212
Verizon Wireless
Aurora, IL
(331) 213
Verizon Wireless
Naperville, IL
(331) 214
Verizon Wireless
Downers Grove, IL
(331) 215
Verizon Wireless
Naperville, IL
(331) 216
AT&T Mobility
Oswego, IL
(331) 217
COMMIO LLC
Lombard, IL
(331) 218
T-Mobile
Wheaton, IL
(331) 219
AT&T Mobility
Aurora, IL
(331) 220
T-Mobile
Aurora, IL
(331) 221
AT&T Illinois
Elmhurst, IL
(331) 222
AT&T Mobility
Saint Charles, IL
(331) 223
Verizon Wireless
Saint Charles, IL
(331) 224
Neutral Tandem
Bensenville, IL
(331) 225
Neutral Tandem
Elmhurst, IL
(331) 226
T-Mobile
Naperville, IL
(331) 227
Bandwidth.com
Sugar Grove, IL
(331) 228
Peerless Network
Saint Charles, IL
(331) 229
Verizon Wireless
Naperville, IL
(331) 230
T-Mobile
Aurora, IL
(331) 231
Verizon Wireless
Oak Brook, IL
(331) 232
AT&T Mobility
West Chicago, IL
(331) 233
Verizon Wireless
Downers Grove, IL
(331) 234
Bandwidth.com
Sugar Grove, IL
(331) 235
AT&T Mobility
Saint Charles, IL
(331) 236
Neutral Tandem
Wheaton, IL
(331) 237
Verizon Business
Naperville, IL
(331) 238
AT&T
Downers Grove, IL
(331) 239
Neutral Tandem
Yorkville, IL
(331) 240
T-Mobile
West Chicago, IL
(331) 241
Neutral Tandem
Lombard, IL
(331) 243
T-Mobile
Lombard, IL
(331) 244
Neutral Tandem
Naperville, IL
(331) 245
T-Mobile
Bartlett, IL
(331) 246
T-Mobile
Lemont, IL
(331) 248
Bandwidth.com
Geneva, IL
(331) 249
Neutral Tandem
Naperville, IL
(331) 250
T-Mobile
Aurora, IL
(331) 251
Verizon Wireless
Downers Grove, IL
(331) 252
Warrenville, IL
(331) 253
Neutral Tandem
Lemont, IL
(331) 254
T-Mobile
Sugar Grove, IL
(331) 255
Neutral Tandem
Aurora, IL
(331) 256
Neutral Tandem
Aurora, IL
(331) 257
AT&T Mobility
Naperville, IL
(331) 258
Neutral Tandem
Aurora, IL
(331) 259
Neutral Tandem
Sugar Grove, IL
(331) 260
Neutral Tandem
Downers Grove, IL
(331) 261
T-Mobile
Lemont, IL
(331) 262
AT&T Mobility
Aurora, IL
(331) 263
Neutral Tandem
Bensenville, IL
(331) 264
AT&T Mobility
Hinsdale, IL
(331) 265
Neutral Tandem
Geneva, IL
(331) 266
AT&T Mobility
Saint Charles, IL
(331) 267
Neutral Tandem
Lombard, IL
(331) 268
T-Mobile
Sugar Grove, IL
(331) 269
T-Mobile
Aurora, IL
(331) 271
T-Mobile
Hinsdale, IL
(331) 272
Neutral Tandem
Saint Charles, IL
(331) 273
COMMIO LLC
Lemont, IL
(331) 274
T-Mobile
Aurora, IL
(331) 275
T-Mobile
Bartlett, IL
(331) 276
AT&T Mobility
Saint Charles, IL
(331) 277
AT&T Mobility
Lombard, IL
(331) 278
Emergency Networks
Aurora, IL
(331) 279
Bandwidth.com
Elmhurst, IL
(331) 280
Verizon Wireless
Downers Grove, IL
(331) 281
AT&T Illinois
Naperville, IL
(331) 282
Neutral Tandem
Hinsdale, IL
(331) 283
Geneva, IL
(331) 284
Neutral Tandem
Bartlett, IL
(331) 285
Verizon Wireless
Oak Brook, IL
(331) 286
Verizon Wireless
Saint Charles, IL
(331) 287
Emergency Networks
Aurora, IL
(331) 288
COMMIO LLC
Elburn, IL
(331) 289
T-Mobile
Hinsdale, IL
(331) 290
AT&T Mobility
Aurora, IL
(331) 291
Verizon Wireless
Downers Grove, IL
(331) 292
Neutral Tandem
Downers Grove, IL
(331) 293
Verizon Wireless
Aurora, IL
(331) 294
Verizon Wireless
Naperville, IL
(331) 295
Emergency Networks
Aurora, IL
(331) 296
Neutral Tandem
Wheaton, IL
(331) 297
Neutral Tandem
Geneva, IL
(331) 298
AT&T Mobility
Naperville, IL
(331) 299
Neutral Tandem
Hinsdale, IL
(331) 300
T-Mobile
Aurora, IL
(331) 301
Neutral Tandem
Aurora, IL
(331) 302
T-Mobile
Aurora, IL
(331) 303
Bandwidth.com
Elburn, IL
(331) 304
T-Mobile
Bartlett, IL
(331) 305
Verizon Wireless
Naperville, IL
(331) 307
Neutral Tandem
Lombard, IL
(331) 308
T-Mobile
Bartlett, IL
(331) 309
COMMIO LLC
Lemont, IL
(331) 310
Neutral Tandem
Big Rock, IL
(331) 312
Verizon Wireless
(331) 313
Emergency Networks
Naperville, IL
(331) 314
Neutral Tandem
(331) 315
AT&T Mobility
Lombard, IL
(331) 316
Neutral Tandem
(331) 317
Neutral Tandem
(331) 318
Bandwidth.com
Lemont, IL
(331) 319
Neutral Tandem
(331) 320
Neutral Tandem
(331) 321
T-Mobile
Aurora, IL
(331) 322
AT&T Mobility
(331) 326
AT&T Mobility
(331) 330
AT&T Mobility
Oswego, IL
(331) 332
AT&T Illinois
Naperville, IL
(331) 333
Bandwidth.com
Naperville, IL
(331) 334
Neutral Tandem
Geneva, IL
(331) 335
AT&T Mobility
(331) 336
Neutral Tandem
Aurora, IL
(331) 341
T-Mobile
Plano, IL
(331) 345
COMMIO LLC
Naperville, IL
(331) 348
Neutral Tandem
Elburn, IL
(331) 356
T-Mobile
Bartlett, IL
(331) 373
Neutral Tandem
Oswego, IL
(331) 385
T-Mobile
Aurora, IL
(331) 388
Neutral Tandem
Sugar Grove, IL
(331) 399
Verizon Wireless
Downers Grove, IL
(331) 400
Neutral Tandem
Oswego, IL
(331) 401
Verizon Wireless
Naperville, IL
(331) 422
Centurylink
Saint Charles, IL
(331) 425
T-Mobile
Aurora, IL
(331) 426
Neutral Tandem
Lemont, IL
(331) 431
Verizon Wireless
Aurora, IL
(331) 442
AT&T Mobility
Saint Charles, IL
(331) 444
Bandwidth.com
Naperville, IL
(331) 452
Verizon Wireless
Aurora, IL
(331) 454
AT&T Mobility
Aurora, IL
(331) 456
First Communications LLC
Roselle, IL
(331) 457
Verizon Wireless
Naperville, IL
(331) 462
Lombard, IL
(331) 465
Bandwidth.com
West Chicago, IL
(331) 466
Neutral Tandem
Glen Ellyn, IL
(331) 472
Centurylink
Naperville, IL
(331) 481
Verizon Wireless
Downers Grove, IL
(331) 500
Neutral Tandem
Geneva, IL
(331) 529
Neutral Tandem
Naperville, IL
(331) 551
Bandwidth.com
Lombard, IL
(331) 575
AT&T Mobility
Aurora, IL
(331) 588
AT&T Mobility
Saint Charles, IL
(331) 600
T-Mobile
Wheaton, IL
(331) 625
Verizon Wireless
Downers Grove, IL
(331) 627
AT&T Mobility
Lombard, IL
(331) 631
Verizon Wireless
Downers Grove, IL
(331) 642
MetroPCS
Elmhurst, IL
(331) 643
MetroPCS
Aurora, IL
(331) 645
MetroPCS
Elmhurst, IL
(331) 684
Bandwidth.com
Aurora, IL
(331) 688
Verizon Wireless
Naperville, IL
(331) 701
Verizon Wireless
Naperville, IL
(331) 702
Verizon Business
Naperville, IL
(331) 703
AT&T Mobility
West Chicago, IL
(331) 704
Neutral Tandem
Elburn, IL
(331) 707
T-Mobile
Aurora, IL
(331) 716
Neutral Tandem
Wheaton, IL
(331) 717
Neutral Tandem
Oswego, IL
(331) 725
AT&T Mobility
Oswego, IL
(331) 746
Elburn, IL
(331) 757
Neutral Tandem
Lemont, IL
(331) 758
Verizon Wireless
Aurora, IL
(331) 771
Verizon Wireless
Saint Charles, IL
(331) 775
Verizon Wireless
Downers Grove, IL
(331) 777
Comcast
Downers Grove, IL
(331) 788
T-Mobile
Geneva, IL
(331) 801
AT&T
Downers Grove, IL
(331) 803
T-Mobile
Lemont, IL
(331) 806
T-Mobile
Wheaton, IL
(331) 808
Neutral Tandem
Plano, IL
(331) 814
Verizon Wireless
Naperville, IL
(331) 826
MetroPCS
Elmhurst, IL
(331) 837
Neutral Tandem
West Chicago, IL
(331) 866
Bandwidth.com
Wheaton, IL
(331) 867
Neutral Tandem
Yorkville, IL
(331) 871
AT&T Mobility
West Chicago, IL
(331) 888
Neutral Tandem
Warrenville, IL
(331) 901
AT&T Mobility
Saint Charles, IL
(331) 903
AT&T Mobility
Downers Grove, IL
(331) 946
Neutral Tandem
Glen Ellyn, IL
(331) 979
Neutral Tandem
Elmhurst, IL
(331) 980
T-Mobile
Aurora, IL
(331) 998
Verizon Wireless
Downers Grove, IL
(331) 999
AT&T Mobility
Oswego, IL

Other Area Codes