Key Findings
US codes with utilization data. NANPA lists additional codes (e.g., Canadian, reserved overlays) in relief planning reports.
Includes US, Canadian, and special-purpose codes
The 330 area code (OH) has the highest utilization rate at 98.38%, with 787 of 800 prefixes assigned. When utilization exceeds 95%, NANPA typically begins relief planning — either an overlay or a split — to ensure continued number availability.
All Area Codes
Look up a specific area code's utilization ranking. Each row links directly to the area code's detail page.
| Rank | Area Code | Utilization |
|---|---|---|
| 1 | 330 | 98.4% |
| 2 | 408 | 98.4% |
| 3 | 213 | 98.3% |
| 4 | 217 | 98.3% |
| 5 | 256 | 98.3% |
| 6 | 267 | 98.3% |
| 7 | 281 | 98.3% |
| 8 | 310 | 98.3% |
| 9 | 317 | 98.3% |
| 10 | 323 | 98.3% |
| 11 | 360 | 98.3% |
| 12 | 407 | 98.3% |
| 13 | 469 | 98.3% |
| 14 | 470 | 98.3% |
| 15 | 484 | 98.3% |
| 16 | 540 | 98.3% |
| 17 | 561 | 98.3% |
| 18 | 573 | 98.3% |
| 19 | 618 | 98.3% |
| 20 | 702 | 98.3% |
| 21 | 713 | 98.3% |
| 22 | 714 | 98.3% |
| 23 | 740 | 98.3% |
| 24 | 786 | 98.3% |
| 25 | 805 | 98.3% |
| 26 | 815 | 98.3% |
| 27 | 832 | 98.3% |
| 28 | 847 | 98.3% |
| 29 | 909 | 98.3% |
| 30 | 205 | 98.1% |
| 31 | 208 | 98.1% |
| 32 | 214 | 98.1% |
| 33 | 240 | 98.1% |
| 34 | 248 | 98.1% |
| 35 | 304 | 98.1% |
| 36 | 305 | 98.1% |
| 37 | 312 | 98.1% |
| 38 | 415 | 98.1% |
| 39 | 443 | 98.1% |
| 40 | 510 | 98.1% |
| 41 | 512 | 98.1% |
| 42 | 608 | 98.1% |
| 43 | 619 | 98.1% |
| 44 | 678 | 98.1% |
| 45 | 707 | 98.1% |
| 46 | 715 | 98.1% |
| 47 | 720 | 98.1% |
| 48 | 757 | 98.1% |
| 49 | 760 | 98.1% |
| 50 | 773 | 98.1% |
| 51 | 812 | 98.1% |
| 52 | 816 | 98.1% |
| 53 | 850 | 98.1% |
| 54 | 870 | 98.1% |
| 55 | 904 | 98.1% |
| 56 | 910 | 98.1% |
| 57 | 916 | 98.1% |
| 58 | 972 | 98.1% |
| 59 | 202 | 98.0% |
| 60 | 203 | 98.0% |
| 61 | 209 | 98.0% |
| 62 | 210 | 98.0% |
| 63 | 212 | 98.0% |
| 64 | 301 | 98.0% |
| 65 | 303 | 98.0% |
| 66 | 309 | 98.0% |
| 67 | 334 | 98.0% |
| 68 | 347 | 98.0% |
| 69 | 404 | 98.0% |
| 70 | 503 | 98.0% |
| 71 | 513 | 98.0% |
| 72 | 516 | 98.0% |
| 73 | 630 | 98.0% |
| 74 | 717 | 98.0% |
| 75 | 770 | 98.0% |
| 76 | 803 | 98.0% |
| 77 | 814 | 98.0% |
| 78 | 864 | 98.0% |
| 79 | 917 | 98.0% |
| 80 | 920 | 98.0% |
| 81 | 215 | 97.9% |
| 82 | 314 | 97.9% |
| 83 | 336 | 97.9% |
| 84 | 405 | 97.9% |
| 85 | 410 | 97.9% |
| 86 | 419 | 97.9% |
| 87 | 601 | 97.9% |
| 88 | 708 | 97.9% |
| 89 | 724 | 97.9% |
| 90 | 801 | 97.9% |
| 91 | 813 | 97.9% |
| 92 | 843 | 97.9% |
| 93 | 845 | 97.9% |
| 94 | 402 | 97.8% |
| 95 | 480 | 97.8% |
| 96 | 541 | 97.8% |
| 97 | 610 | 97.8% |
| 98 | 631 | 97.8% |
| 99 | 704 | 97.8% |
| 100 | 817 | 97.8% |
| 101 | 818 | 97.8% |
| 102 | 860 | 97.8% |
| 103 | 918 | 97.8% |
| 104 | 315 | 97.6% |
| 105 | 559 | 97.6% |
| 106 | 570 | 97.6% |
| 107 | 646 | 97.6% |
| 108 | 804 | 97.6% |
| 109 | 919 | 97.6% |
| 110 | 530 | 97.5% |
| 111 | 609 | 97.5% |
| 112 | 615 | 97.5% |
| 113 | 937 | 97.5% |
| 114 | 718 | 97.4% |
| 115 | 732 | 97.4% |
| 116 | 201 | 97.3% |
| 117 | 614 | 97.3% |
| 118 | 706 | 97.1% |
| 119 | 787 | 97.1% |
| 120 | 973 | 97.1% |
| 121 | 954 | 97.0% |
| 122 | 518 | 96.9% |
| 123 | 703 | 96.9% |
| 124 | 978 | 96.6% |
| 125 | 970 | 96.5% |
| 126 | 903 | 96.4% |
| 127 | 270 | 96.3% |
| 128 | 313 | 96.1% |
| 129 | 781 | 96.1% |
| 130 | 617 | 96.0% |
| 131 | 716 | 95.6% |
| 132 | 318 | 95.5% |
| 133 | 507 | 95.4% |
| 134 | 412 | 95.3% |
| 135 | 423 | 95.3% |
| 136 | 509 | 95.1% |
| 137 | 440 | 94.8% |
| 138 | 662 | 94.4% |
| 139 | 406 | 94.3% |
| 140 | 206 | 94.1% |
| 141 | 603 | 94.0% |
| 142 | 602 | 93.5% |
| 143 | 508 | 93.4% |
| 144 | 605 | 93.1% |
| 145 | 346 | 93.0% |
| 146 | 701 | 92.9% |
| 147 | 949 | 92.9% |
| 148 | 207 | 92.8% |
| 149 | 580 | 92.4% |
| 150 | 626 | 91.8% |
| 151 | 806 | 91.6% |
| 152 | 956 | 91.6% |
| 153 | 502 | 91.5% |
| 154 | 785 | 90.9% |
| 155 | 912 | 90.8% |
| 156 | 765 | 90.5% |
| 157 | 828 | 90.4% |
| 158 | 989 | 90.4% |
| 159 | 908 | 89.9% |
| 160 | 417 | 89.0% |
| 161 | 650 | 89.0% |
| 162 | 352 | 88.8% |
| 163 | 218 | 88.3% |
| 164 | 929 | 88.3% |
| 165 | 620 | 88.1% |
| 166 | 914 | 88.0% |
| 167 | 562 | 87.8% |
| 168 | 734 | 87.5% |
| 169 | 252 | 86.9% |
| 170 | 520 | 86.8% |
| 171 | 657 | 86.5% |
| 172 | 808 | 86.4% |
| 173 | 951 | 86.3% |
| 174 | 505 | 85.5% |
| 175 | 229 | 85.0% |
| 176 | 585 | 84.4% |
| 177 | 661 | 84.0% |
| 178 | 856 | 83.5% |
| 179 | 254 | 83.4% |
| 180 | 719 | 83.0% |
| 181 | 907 | 82.1% |
| 182 | 302 | 81.9% |
| 183 | 606 | 79.6% |
| 184 | 925 | 79.6% |
| 185 | 262 | 79.3% |
| 186 | 712 | 79.1% |
| 187 | 928 | 79.0% |
| 188 | 501 | 78.8% |
| 189 | 425 | 78.5% |
| 190 | 571 | 78.5% |
| 191 | 727 | 77.8% |
| 192 | 517 | 76.9% |
| 193 | 901 | 76.9% |
| 194 | 216 | 76.3% |
| 195 | 413 | 75.1% |
| 196 | 775 | 75.0% |
| 197 | 337 | 74.9% |
| 198 | 224 | 74.3% |
| 199 | 612 | 73.6% |
| 200 | 641 | 73.0% |
| 201 | 401 | 72.5% |
| 202 | 515 | 72.1% |
| 203 | 231 | 71.5% |
| 204 | 802 | 71.3% |
| 205 | 319 | 70.6% |
| 206 | 504 | 70.3% |
| 207 | 859 | 70.3% |
| 208 | 479 | 70.1% |
| 209 | 858 | 70.1% |
| 210 | 414 | 68.9% |
| 211 | 607 | 68.5% |
| 212 | 586 | 68.3% |
| 213 | 269 | 68.1% |
| 214 | 616 | 68.1% |
| 215 | 931 | 67.1% |
| 216 | 361 | 67.0% |
| 217 | 913 | 66.6% |
| 218 | 251 | 65.9% |
| 219 | 774 | 65.4% |
| 220 | 575 | 65.1% |
| 221 | 239 | 64.8% |
| 222 | 660 | 64.4% |
| 223 | 320 | 63.8% |
| 224 | 253 | 63.6% |
| 225 | 434 | 63.6% |
| 226 | 810 | 63.4% |
| 227 | 865 | 63.1% |
| 228 | 940 | 63.1% |
| 229 | 321 | 62.5% |
| 230 | 225 | 62.4% |
| 231 | 307 | 62.1% |
| 232 | 435 | 62.0% |
| 233 | 681 | 61.9% |
| 234 | 830 | 61.8% |
| 235 | 219 | 61.5% |
| 236 | 385 | 61.5% |
| 237 | 941 | 60.4% |
| 238 | 651 | 59.4% |
| 239 | 863 | 58.9% |
| 240 | 308 | 57.9% |
| 241 | 980 | 57.9% |
| 242 | 386 | 57.1% |
| 243 | 424 | 56.6% |
| 244 | 667 | 56.0% |
| 245 | 985 | 55.9% |
| 246 | 260 | 55.5% |
| 247 | 478 | 55.3% |
| 248 | 971 | 54.9% |
| 249 | 409 | 54.3% |
| 250 | 636 | 54.1% |
| 251 | 936 | 52.5% |
| 252 | 567 | 52.4% |
| 253 | 682 | 52.1% |
| 254 | 979 | 51.5% |
| 255 | 325 | 51.0% |
| 256 | 831 | 50.6% |
| 257 | 574 | 50.4% |
| 258 | 234 | 49.5% |
| 259 | 731 | 49.4% |
| 260 | 563 | 48.5% |
| 261 | 862 | 47.8% |
| 262 | 276 | 46.4% |
| 263 | 762 | 46.3% |
| 264 | 763 | 45.9% |
| 265 | 915 | 45.8% |
| 266 | 857 | 45.4% |
| 267 | 939 | 45.0% |
| 268 | 906 | 44.9% |
| 269 | 442 | 44.1% |
| 270 | 779 | 43.5% |
| 271 | 432 | 42.6% |
| 272 | 952 | 42.4% |
| 273 | 316 | 42.3% |
| 274 | 272 | 41.9% |
| 275 | 737 | 41.3% |
| 276 | 772 | 39.0% |
| 277 | 623 | 38.9% |
| 278 | 551 | 37.5% |
| 279 | 984 | 36.8% |
| 280 | 945 | 36.6% |
| 281 | 475 | 36.0% |
| 282 | 430 | 35.8% |
| 283 | 848 | 35.0% |
| 284 | 228 | 34.3% |
| 285 | 872 | 34.3% |
| 286 | 531 | 33.0% |
| 287 | 747 | 32.3% |
| 288 | 223 | 31.5% |
| 289 | 769 | 31.4% |
| 290 | 539 | 29.8% |
| 291 | 669 | 29.6% |
| 292 | 689 | 28.8% |
| 293 | 838 | 28.0% |
| 294 | 331 | 27.9% |
| 295 | 458 | 27.6% |
| 296 | 447 | 26.9% |
| 297 | 725 | 26.9% |
| 298 | 754 | 26.6% |
| 299 | 680 | 26.1% |
| 300 | 947 | 26.1% |
| 301 | 628 | 24.1% |
| 302 | 629 | 24.1% |
| 303 | 878 | 23.8% |
| 304 | 938 | 23.4% |
| 305 | 463 | 23.3% |
| 306 | 839 | 23.3% |
| 307 | 986 | 23.0% |
| 308 | 445 | 22.4% |
| 309 | 854 | 22.4% |
| 310 | 659 | 21.8% |
| 311 | 959 | 20.1% |
| 312 | 332 | 19.9% |
| 313 | 743 | 19.8% |
| 314 | 930 | 19.8% |
| 315 | 582 | 18.9% |
| 316 | 943 | 18.6% |
| 317 | 279 | 18.5% |
| 318 | 220 | 17.6% |
| 319 | 380 | 17.0% |
| 320 | 227 | 16.8% |
| 321 | 934 | 16.1% |
| 322 | 730 | 15.9% |
| 323 | 640 | 15.8% |
| 324 | 840 | 15.8% |
| 325 | 826 | 15.1% |
| 326 | 572 | 14.5% |
| 327 | 448 | 14.4% |
| 328 | 341 | 13.9% |
| 329 | 726 | 13.6% |
| 330 | 835 | 13.3% |
| 331 | 464 | 13.1% |
| 332 | 339 | 13.0% |
| 333 | 472 | 13.0% |
| 334 | 948 | 12.3% |
| 335 | 656 | 12.1% |
| 336 | 534 | 12.0% |
| 337 | 564 | 11.6% |
| 338 | 351 | 11.5% |
| 339 | 820 | 11.4% |
| 340 | 326 | 10.9% |
| 341 | 350 | 10.6% |
| 342 | 557 | 9.6% |
| 343 | 645 | 9.4% |
| 344 | 364 | 9.0% |
| 345 | 771 | 8.8% |
| 346 | 329 | 8.4% |
| 347 | 728 | 8.4% |
| 348 | 369 | 6.3% |
| 349 | 283 | 5.9% |
| 350 | 821 | 5.3% |
| 351 | 983 | 5.3% |
| 352 | 327 | 5.1% |
| 353 | 363 | 4.8% |
| 354 | 235 | 4.5% |
| 355 | 274 | 3.8% |
| 356 | 686 | 3.5% |
| 357 | 975 | 3.0% |
| 358 | 738 | 2.8% |
| 359 | 324 | 2.4% |
| 360 | 353 | 1.6% |
| 361 | 483 | 0.5% |
Showing 361 of 361 area codes
Methodology
Data sources: Prefix utilization data from the NANPA NPA Exhaust Analysis report. Relief planning status from the NANPA NPA Relief Planning Reports.
Utilization %: Calculated as (assigned prefixes / total assignable prefixes) × 100. Only prefixes marked as "assigned" in the NANPA database are counted.
Ranking: Area codes are sorted by utilization percentage (descending), with ties broken by total assigned prefixes.
Excluded: 15 recently activated or pending overlay area codes (no utilization data yet) with 0% utilization (assigned but not yet active) are not listed here. See the Statistics page for the full list of reserved codes.
Last updated: September 8, 2026
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