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Area Code 303 is in Colorado Colorado Area Codes 303 - 719 - 720 - 970 Colorado Area Code Overlays (720 and 303) Area Code 303 History: 01/01/1947 Area code 303 was put into service. In 1988 Area code 303 was split to form area code 719. In 1995 area code 303 was split to form area code 970. In 1998 area code 303 was overlaid with area code 720. Counties in Colorado within area code 303 include: Adams County, Arapahoe County, Boulder County, Broomfield County, Clear Creek County, Denver County, Douglas County, Eagle County, El Paso County, Elbert County, Gilpin County, Jefferson County, Park County, Sedgwick County, and Weld County. Places in Colorado within area code 303 include: Area code 303 serves Aurora, Boulder, Denver, Longmont and Westminster. All Places within Area Code 303 Adams City Allenspark Arvada Aspen Park Aurora Bailey Bennett Black Forest Black Hawk Bond Boulder Bow Mar Brighton Broomfield Buffalo Creek Byers Castle Rock Centennial Central City Cherry Hills Columbine Valley Commerce City Conifer Dacono Deckers Deer Trail Denver Dumont Dupont East Lake Eastlake Edgewater Elbert Eldorado Springs Elizabeth Empire Englewood Erie Evergreen Federal Heights Firestone Fort Logan Fort Lupton Foxfield Foxton Franktown Frederick Georgetown Glendale Golden Grant Grants Ranch Greenwood Village Henderson Highlands Ranch Hudson Idaho Springs Indian Hills Irondale Jamestown Keenesburg Kiowa Kittredge Lafayette Lakeside Lakewood Larkspur Littleton Lone Tree Longmont Louisville Lowry Lyons Montclair Morrison Nederland Niwot North Glenn Parker Pine Roggen Rollinsville Sedalia Sedgwick Shawnee Sheridan Silver Plume Strasburg Superior Thornton Ward Watkins Wattenburg Welby Westminster Wheat Ridge Area Code Look Up - Select An Area Code To Find Its Location 201 202 203 204 205 206 207 208 209 210 212 213 214 215 216 217 218 219 224 225 226 228 229 231 234 239 240 242 246 248 250 251 252 253 254 256 260 262 264 267 268 269 270 276 281 284 289 301 302 303 304 305 306 307 308 309 310 312 313 314 315 316 317 318 319 320 321 323 325 330 331 334 336 337 339 340 343 345 347 351 352 360 361 364 385 386 401 402 403 404 405 406 407 408 409 410 412 413 414 415 416 417 418 419 423 424 425 430 432 434 435 438 440 441 442 443 450 456 458 469 473 475 478 479 480 484 500 501 502 503 504 505 506 507 508 509 510 512 513 514 515 516 517 518 519 520 530 534 540 541 551 559 561 562 563 567 570 571 573 574 575 579 580 581 585 586 587 600 601 602 603 604 605 606 607 608 609 610 612 613  614 615 616 617 618 619 620 623 626 630 631 636 641 646 647 649 650 651 657 660 661 662 664 670 671 678 681 682 684 700 701 702 703 704 705 706 707 708 709 710 712 713 714 715 716 717 718 719 720 721 724 727 731 732 734 740 747 754 757 758 760 762 763 765 767 769 770 772 773 774 775 778 779 780 781 784 785 786 787 800 801 802 803 804 805 806 807 808 809 810 812 813 814 815 816 817 818 819 828 829 830 831 832 843 845 847 848 849 850 856 857 858 859 860 862 863 864 865 866 867 868 869 870 872 876 877 878 888 900 901 902 903 904 905 906 907 908 909 910 912 913 914 915 916 917 918 919 920 925 928 931 936 937 938 939 940 941 947 949 951 952 954 956 970 971 972 973 978 979 980 985 989   Terms of Use - Privacy Statement www.AreaCodeHelp.com is not responsible for any damages or problems caused by this service. If you have any suggestions or comments contact us. Site Copyright 2006 www.areacodehelp.com

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