Area code 815

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Area code 815 is a telephone area code for the northwestern corner and southern Chicagoland suburbs of the state of Illinois. An overlay area code 779 was implemented on March 17 of 2007. A month earlier, on February 17, 1+ten-digits were required to be dialed for all calls in and out of area code 815--in preparation for the 779 overlay.

	North: 608, 262
West: 563	area code 815	East: 847/224, 630, 708
	South: 309, 217

Cities in the 815/779 area code include:
Apple River, Illinois
Belvidere, Illinois
Bolingbrook, Illinois
Byron, Illinois--Prefixes include: 234 406 803
Cedarville, Illinois--Prefixes include: 563
Coal City, Illinois
Crystal Lake, Illinois--Prefixes include: <204 219 261 276 301 356 404 425 444 455 459 477 479 526 788 893br> Davis Junction, Illinois--Prefixes include:
DeKalb, Illinois
Dixon, Illinois
East Dubuque, Illinois
Frankfort, Illinois
Freeport, Illinois--Prefixes include: 232 233 235 238 266 275 291 297 541 599 616 618 650 656 801 821 908 990
Galena, Illinois
Joliet, Illinois
Kankakee, Illinois
Lanark, Illinois--Prefixes include: 270 493 658 952
Lena, Illinois--Prefixes include: 369 809
Loves Park, Illinois
Machesney Park, Illinois
McHenry, Illinois
Mendota, Illinois
Minooka, Illinois
Mokena, Illinois
Monroe Center, Illinois--Prefixes include: 393
Morris, Illinois
Mount Morris, Illinois--Prefixes include: 734
New Lenox, Illinois--Prefixes include: 485 462
Orangeville, Illinois--Prefixes include: 789 819
Oregon, Illinois--Prefixes include: 732
Ottawa, Illinois
Plainfield, Illinois
Rochelle, Illinois--Prefixes include: 561 562 888 917
Rockford, Illinois--Prefixed include: 201 202 209 218 222 226 227 229 231 242 243 262 282 289 296 298 299 315 316 319 378 381 387 391 394 395 397 398 399 470 480 484 489 490 494 505 509 516 519 520 540 543 558 601 608 621 633 636 637 639 641 654 670 681 703 708 713 720 721 742 749 763 847 860 870 871 877 904 914 921 961 962 963 964 965 966 967 968 969 971 972 977 978 979 980 983 985 986 987 988 997
Romeoville, Illinois
Savanna, Illinois
Shannon, Illinois
Sterling, Illinois
Stillman Valley, Illinois--Prefixes include: 645
Stockton, Illinois--Prefixes include: 840 947
Streator, Illinois
Tinley Park, Illinois
Warren, Illinois--Prefixes include: 745 818
Woodstock, Illinois

	Illinois Area codes 217 | 224 | 309 | 312 | 618 | 630 | 708 | 773 | 779 | 815 | 847