Area Code 720
| Prefix | City | State |
|---|---|---|
| 123 | Los Angeles | CA |
| 189 | Englewood | CO |
| 194 | Winston | KY |
| 200 | Centennial | CO |
| 201 | Denver | CO |
| 203 | Denver | CO |
| 204 | Longmont | CO |
| 205 | Denver | CO |
| 206 | Denver | CO |
| 207 | Aurora | CO |
| 208 | Denver | CO |
| 209 | Denver | CO |
| 210 | Denver | CO |
| 212 | Denver | CO |
| 213 | Denver | CO |
| 214 | Denver | CO |
| 216 | Aurora | CO |
| 217 | Denver | CO |
| 218 | Denver | CO |
| 219 | Denver | CO |
| 220 | Denver | CO |
| 221 | Denver | CO |
| 222 | Aurora | CO |
| 223 | Brighton | CO |
| 224 | Denver | CO |
| 225 | Denver | CO |
| 226 | Denver | CO |
| 227 | Denver | CO |
| 228 | Denver | CO |
| 229 | Denver | CO |
| 230 | Brighton | CO |
| 231 | Denver | CO |
| 232 | Denver | CO |
| 233 | Denver | CO |
| 234 | Denver | CO |
| 235 | Denver | CO |
| 236 | Denver | CO |
| 238 | Denver | CO |
| 239 | Denver | CO |
| 240 | Denver | CO |
| 241 | Denver | CO |
| 242 | Denver | CO |
| 244 | Denver | CO |
| 246 | Denver | CO |
| 247 | Brighton | CO |
| 248 | Denver | CO |
| 249 | Denver | CO |
| 250 | Denver | CO |
| 251 | Aurora | CO |
| 252 | Denver | CO |
| 253 | Denver | CO |
| 254 | Denver | CO |
| 255 | Denver | CO |
| 256 | Denver | CO |
| 257 | Denver | CO |
| 258 | Denver | CO |
| 259 | Denver | CO |
| 260 | Denver | CO |
| 261 | Denver | CO |
| 262 | Aurora | CO |
| 263 | Brighton | CO |
| 264 | Denver | CO |
| 265 | Brighton | CO |
| 266 | Denver | CO |
| 267 | Englewood | CO |
| 268 | Englewood | CO |
| 269 | Denver | CO |
| 270 | Denver | CO |
| 271 | Denver | CO |
| 272 | Denver | CO |
| 273 | Denver | CO |
| 274 | Denver | CO |
| 275 | Denver | CO |
| 276 | Denver | CO |
| 277 | Aurora | CO |
| 278 | Aurora | CO |
| 279 | Denver | CO |
| 280 | Denver | CO |
| 281 | Aurora | CO |
| 282 | Denver | CO |
| 283 | Littleton | CO |
| 284 | Denver | CO |
| 285 | Aurora | CO |
| 286 | Denver | CO |
| 287 | Denver | CO |
| 288 | Aurora | CO |
| 289 | Denver | CO |
| 290 | Denver | CO |
| 291 | Denver | CO |
| 292 | Denver | CO |
| 293 | Denver | CO |
| 294 | Denver | CO |
| 296 | Denver | CO |
| 297 | Denver | CO |
| 298 | Denver | CO |
| 299 | Denver | CO |
| 300 | Denver | CO |
| 301 | Denver | CO |
| 302 | Denver | CO |
| 304 | Table Mesa | CO |
| 305 | Denver | CO |
| 306 | Denver | CO |
| 308 | Denver | CO |
| 309 | Denver | CO |
| 310 | Allenspark | CO |
| 312 | Denver | CO |
| 313 | Denver | CO |
| 314 | Denver | CO |
| 317 | Denver | CO |
| 318 | Denver | CO |
| 319 | Denver | CO |
| 320 | Denver | CO |
| 321 | Lakewood | CO |
| 322 | Denver | CO |
| 323 | Denver | CO |
| 324 | Aurora | CO |
| 327 | Denver | CO |
| 329 | Denver | CO |
| 330 | Denver | CO |
| 331 | Denver | CO |
| 332 | Englewood | CO |
| 333 | Denver | CO |
| 334 | Denver | CO |
| 335 | Denver | CO |
| 337 | Denver | CO |
| 338 | Denver | CO |
| 339 | Denver | CO |
| 341 | Denver | CO |
| 343 | Aurora | CO |
| 344 | Littleton | CO |
| 345 | Denver | CO |
| 346 | Denver | CO |
| 347 | Denver | CO |
| 348 | Littleton | CO |
| 350 | Denver | CO |
| 351 | Denver | CO |
| 352 | Denver | CO |
| 353 | Denver | CO |
| 356 | Denver | CO |
| 359 | Denver | CO |
| 362 | Denver | CO |
| 363 | Denver | CO |
| 364 | Denver | CO |
| 365 | Denver | CO |
| 366 | Denver | CO |
| 367 | Aurora | CO |
| 368 | Aurora | CO |
| 371 | Denver | CO |
| 373 | Denver | CO |
| 374 | Denver | CO |
| 375 | Denver | CO |
| 377 | Denver | CO |
| 379 | Denver | CO |
| 381 | Denver | CO |
| 382 | Denver | CO |
| 383 | ||
| 384 | Denver | CO |
| 385 | Denver | CO |
| 389 | Denver | CO |
| 393 | Denver | CO |
| 394 | Denver | CO |
| 398 | Denver | CO |
| 401 | Denver | CO |
| 404 | Denver | CO |
| 406 | Boulder | CO |
| 407 | Denver | CO |
| 412 | Denver | CO |
| 413 | Denver | CO |
| 420 | Denver | CO |
| 421 | Denver | CO |
| 422 | Denver | CO |
| 423 | Denver | CO |
| 424 | Denver | CO |
| 427 | Aurora | CO |
| 429 | Denver | CO |
| 433 | Denver | CO |
| 434 | Denver | CO |
| 435 | Denver | CO |
| 436 | Denver | CO |
| 438 | Longmont | CO |
| 440 | Denver | CO |
| 444 | Centennial | CO |
| 447 | Denver | CO |
| 448 | Denver | CO |
| 449 | Denver | CO |
| 452 | Denver | CO |
| 453 | Clark | NJ |
| 457 | Denver | CO |
| 468 | Denver | CO |
| 470 | Denver | CO |
| 472 | Denver | CO |
| 473 | Denver | CO |
| 475 | Denver | CO |
| 479 | Denver | CO |
| 480 | Denver | CO |
| 482 | Centennial | CO |
| 488 | Centennial | CO |
| 489 | Centennial | CO |
| 490 | Denver | CO |
| 493 | Centennial | CO |
| 494 | Longmont | CO |
| 495 | Denver | CO |
| 496 | Denver | CO |
| 497 | Golden | CO |
| 506 | Denver | CO |
| 514 | Denver | CO |
| 519 | Denver | CO |
| 521 | Denver | CO |
| 524 | Denver | CO |
| 528 | Centennial | CO |
| 529 | Centennial | CO |
| 530 | Denver | CO |
| 532 | Aurora | CO |
| 533 | Denver | CO |
| 535 | Denver | CO |
| 536 | Centennial | CO |
| 540 | Westminster | CO |
| 542 | Westminster | CO |
| 544 | Lakewood | CO |
| 548 | Denver | CO |
| 549 | Denver | CO |
| 554 | Centennial | CO |
| 555 | Lakewood | CO |
| 558 | Broomfield | CO |
| 559 | Denver | CO |
| 560 | Denver | CO |
| 561 | Boulder | CO |
| 562 | Boulder | CO |
| 563 | Boulder | CO |
| 564 | Boulder | CO |
| 565 | Boulder | CO |
| 566 | Broomfield | CO |
| 567 | Denver | CO |
| 568 | Englewood | CO |
| 569 | Denver | CO |
| 570 | Denver | CO |
| 578 | Denver | CO |
| 579 | Aurora | CO |
| 581 | Denver | CO |
| 583 | Denver | CO |
| 587 | Denver | CO |
| 596 | Denver | CO |
| 620 | Denver | CO |
| 621 | Denver | CO |
| 622 | Boulder | CO |
| 624 | Denver | CO |
| 628 | Denver | CO |
| 629 | Denver | CO |
| 635 | Denver | CO |
| 641 | Denver | CO |
| 643 | Vista | CA |
| 648 | Las Vegas | NV |
| 652 | Longmont | CO |
| 660 | Castle Rock | CO |
| 663 | Denver | CO |
| 670 | Aurora | CO |
| 675 | Denver | CO |
| 684 | Longmont | CO |
| 685 | Brighton | CO |
| 690 | Denver | CO |
| 693 | Parker | CO |
| 723 | Denver | CO |
| 732 | Denver | CO |
| 733 | Castle Rock | CO |
| 744 | Denver | CO |
| 746 | Golden | CO |
| 747 | Denver | CO |
| 748 | Denver | CO |
| 771 | Denver | CO |
| 775 | Denver | CO |
| 777 | Aurora | CO |
| 785 | Denver | CO |
| 810 | Aurora | CO |
| 833 | Englewood | CO |
| 834 | Denver | CO |
| 836 | Denver | CO |
| 837 | Denver | CO |
| 838 | Denver | CO |
| 839 | Denver | CO |
| 840 | Denver | CO |
| 841 | Denver | CO |
| 842 | Parker | CO |
| 847 | Aurora | CO |
| 848 | Aurora | CO |
| 849 | Denver | CO |
| 850 | Englewood | CO |
| 851 | Parker | CO |
| 852 | Englewood | CO |
| 854 | Denver | CO |
| 855 | Denver | CO |
| 857 | Aurora | CO |
| 858 | Aurora | CO |
| 859 | Aurora | CO |
| 862 | Aurora | CO |
| 863 | Denver | CO |
| 864 | Longmont | CO |
| 865 | Denver | CO |
| 867 | Denver | CO |
| 870 | Aurora | CO |
| 872 | Northglenn | CO |
| 873 | Englewood | CO |
| 874 | Englewood | CO |
| 875 | Englewood | CO |
| 876 | Aurora | CO |
| 877 | Denver | CO |
| 878 | Denver | CO |
| 879 | Denver | CO |
| 880 | Denver | CO |
| 881 | Denver | CO |
| 882 | Denver | CO |
| 883 | Denver | CO |
| 884 | Denver | CO |
| 886 | Aurora | CO |
| 887 | Broomfield | CO |
| 888 | Denver | CO |
| 889 | Denver | CO |
| 890 | Louisville | CO |
| 891 | Denver | CO |
| 895 | Englewood | CO |
| 897 | Denver | CO |
| 898 | Arvada | CO |
| 903 | Denver | CO |
| 904 | Denver | CO |
| 907 | Denver | CO |
| 913 | Denver | CO |
| 917 | Denver | CO |
| 920 | Denver | CO |
| 921 | Denver | CO |
| 922 | Littleton | CO |
| 924 | Bailey | CO |
| 928 | Hebron | OH |
| 929 | Northglenn | CO |
| 931 | Denver | CO |
| 932 | Denver | CO |
| 933 | Denver | CO |
| 934 | Denver | CO |
| 935 | Denver | CO |
| 936 | Denver | CO |
| 937 | Denver | CO |
| 938 | Denver | CO |
| 939 | Denver | CO |
| 940 | Denver | CO |
| 941 | Denver | CO |
| 943 | Denver | CO |
| 944 | Denver | CO |
| 945 | Denver | CO |
| 946 | Denver | CO |
| 947 | Denver | CO |
| 949 | Aurora | CO |
| 951 | Aurora | CO |
| 956 | Denver | CO |
| 961 | Denver | CO |
| 962 | Lakewood | CO |
| 963 | Lakewood | CO |
| 971 | Denver | CO |
| 972 | Northglenn | CO |
| 974 | Denver | CO |
| 975 | Aurora | CO |
| 976 | Denver | CO |
| 977 | Northglenn | CO |
| 979 | Denver | CO |
| 980 | Denver | CO |
| 981 | Littleton | CO |
| 982 | Denver | CO |
| 984 | Denver | CO |
| 985 | Denver | CO |
| 987 | Denver | CO |
| 988 | Denver | CO |
| 989 | Denver | CO |
| 998 | Aurora | CO |
| 999 | Denver | CO |