Area code 307 is the telephone area code in the North American Numbering Plan for the entire U.S. state of Wyoming. It is one of the 86 original North American area codes created by the American Telephone and Telegraph Company (AT&T) in 1947.

Because it is sparsely populated, Wyoming is one of only eleven states (as of April 8, 2020) with only one area code.

The numbering plan includes the following communities, with their respective central office codes:

• Afton: 226, 248, 884, 885, 886, 887
• Albin: 246
• Alpine: 654, 656
• Baggs: 380, 383
• Basin: 440, 568
• Big Piney: 260, 276
• Buffalo: 217, 278, 425, 620, 621, 684, 719
• Burlington: 762
• Burns: 547
• Casper: 215, 224, 230, 232, 233, 234, 235, 236, 237, 243, 247, 251, 253, 258, 259, 261, 262, 265, 266, 267, 268, 277, 315, 333, 337, 377, 439, 441, 462, 472, 473, 577, 702, 724, 776, 797, 995
• Cheyenne: 214, 220, 221, 222, 256, 274, 275, 286, 287, 316, 317, 365, 369, 414, 421, 426, 432, 433, 443, 459, 475, 477, 509, 514, 529, 630, 631, 632, 633, 634, 635, 637, 638, 640, 650, 666, 701, 757, 771, 772, 773, 775, 777, 778, 823, 829, 920, 996
• Chugwater: 422
• Clearmont: 758
• Cody: 204, 213, 250, 272, 296, 527, 578, 586, 587, 712, 899
• Cokeville: 229, 270, 279, 600
• Douglas: 298, 351, 358, 359, 624, 717
• Dubois: 239, 450, 455
• East Thermopolis: 480, 722, 864, 921
• Encampment: 327
• Evanston: 255, 288, 313, 444, 497, 677, 679, 708, 783, 789, 799
• Frannie: 664
• Gas Hills: 457
• Gillette: 228, 257, 299, 363, 487, 567, 622, 660, 670, 680, 681, 682, 685, 686, 687, 688, 689, 696, 704
• Glendo: 735
• Glenrock: 309, 436, 554, 741
• Green River: 297, 364, 466, 707, 870, 871, 872, 875
• Greybull: 373, 765
• Guernsey: 836
• Hanna: 325, 339, 348
• Hulett: 467
• Jackson: 200, 201, 203, 249, 264, 413, 690, 699, 713, 730, 732, 733, 734, 739, 740, 774
• Kaycee: 738
• Kemmerer: 723, 727, 800, 828, 877
• La Barge: 386, 390
• La Grange: 409, 834
• Lander: 206, 330, 332, 335, 345, 349, 438, 488, 714
• Laramie: 223, 314, 343, 399, 460, 703, 721, 742, 745, 755, 760, 761, 766, 977
• Lingle: 205, 837
• Lovell: 548, 731
• Lusk: 216, 334, 340, 481, 759
• Lyman: 787
• Manila: 874
• Medicine Bow: 379, 404, 520
• Meeteetse,: 868
• Midwest: 437
• Moran: 541, 543, 999
• Moorcroft: 391, 756
• Mountain View: 747, 780, 782
• Newcastle: 465, 629, 744, 746, 941, 949
• Pine Bluffs: 245
• Pinedale: 231, 360, 367, 537, 749
• Powell: 202, 219, 254, 271, 716, 754, 764
• Rawlins: 320, 321, 324, 328, 370, 417, 710
• Riverton: 240, 463, 709, 840, 850, 851, 854, 855, 856, 857, 858
• Rock River: 378, 798
• Rock Springs: 209, 212, 252, 350, 352, 354, 362, 371, 382, 389, 448, 522, 705, 922
• Saratoga: 326, 329, 447
• Sheridan: 429, 461, 533, 655, 672, 673, 674, 675, 683, 706, 751, 752, 763
• Shoshoni: 728, 876
• Sundance: 281, 282, 283, 290, 790
• Ten Sleep: 366
• Thermopolis: 480, 722, 864, 921
• Torrington: 338, 401, 532, 534, 575, 715
• Upton: 468
• West Edgemont: 663
• West Lyman: 788
• Wheatland: 241, 269, 322, 331, 720, 779, 881
• Worland: 347, 375, 388, 431, 718
• Wright: 464, 939
• Premium calls (unassigned): 208, 211, 307, 308, 311, 406, 411, 470, 511, 536, 555, 558, 559, 605, 611, 700, 711, 725, 811, 911, 950, 958, 959, 970, 976

• List of North American Numbering Plan area codes

• NANPA area code map of Wyoming

43°00′N 107°30′W