| Format ; Parent Format ; Comment |
| XX XXX XXX* ; fixed_2/3-13 |
| XX XX XX XX XX ; fixed_2/3-13 |
| XX XXXX XXX* ; fixed_2/3-13 |
| XX XXX XX X* ; fixed_2/3-13 |
| XX XXX XXX XX* ; fixed_2/3-13 |
| XX XX XX X XX XX ; fixed_2/3-13 |
| XXX XXX XX** ; fixed_3/3-12 |
| XXX XXXX XXX* ; fixed_3/3-12 |
| XXX XX XX X* ; fixed_3/3-12 |
| XXX XX XX XX XX ; fixed_3/3-12 |
| XXX XXX XX XX ; fixed_3/3-12 |
| XXX XXX XX XX X ; fixed_3/3-12 |
| XXX XXX XXX XX* ; fixed_3/3-12 |
| XXXX XXX X*** ; fixed_4/2-11 |
| XX XX XX XX ; fixed_4/2-11 ; "Sometimes four-digit area codes are split into two groups of two." |
| XX XX X XX XX ; fixed_4/2-11 ; "Sometimes four-digit area codes are split into two groups of two." |
| XX XX XX XX XX ; fixed_4/2-11 ; "Sometimes four-digit area codes are split into two groups of two." |
| XX XX X XX XX XX ; fixed_4/2-11 ; "Sometimes four-digit area codes are split into two groups of two." |
| XX XX XX XX XX XX ; fixed_4/2-11 ; "Sometimes four-digit area codes are split into two groups of two." |
| XXXX XXXX X*** ; fixed_4/2-11 |
| XXXX XXX XXX XXX ; fixed_4/2-11 |
| XXXX XX XXX XX ; fixed_4/2-11 |
| XXXX XXX XX XX ; fixed_4/2-11 |
| XXXX XX XX XX* ; fixed_4/2-11 |
| XXXXX XXX XXX* ; fixed_5/2-10 |
| XXXXX XXXX XXX* ; fixed_5/2-10 |
| XXXXX XXX XXX XXX ; fixed_5/2-10 |
| XXXX XX XXX XX ; mobile_4/7 |
| XXXX XXX XXXX ; mobile_4/7 |
| XXXX XXXX XXX ; mobile_4/7 |
| XXX XXXXXXXX ; mobile_4/7 |
| XXX XXX XXX XX ; mobile_4/7 |
| XXX XXX XXX X ; mobile_3/7-8 |
| XXX XX* XXX XX ; mobile_3/7-8 |
| XXX XXX XXX X ; mobile_3/7-8 |
| XXX XX* XXX XX ; tollfree_3/7-12 |
| XXX XXX XXX X ; tollfree_3/7-12 |
| XXX XXXX XXX ; tollfree_3/7-12 |
| XXX XXX XX XX* ; tollfree_3/7-12 |
| XXX XXXXXX XX X*** ; tollfree_3/7-12 |
| 900 X XXX XXX* ; varcost_3/1/4-10 ; "Alternate format for premium rate numbers." |
| 900 X XXXX XXX* ; varcost_3/1/4-10 ; "Alternate format for premium rate numbers." |
| 180 X XXX XXX ; varcost_3/1/4-10 |
| 180X XXXX** ; varcost_3/1/4-10 ; "Medium rate numbers often have the first group with four digits (180X)" |
| 180X XX XX XX ; varcost_3/1/4-10 |
| 900X XXXX****** ; varcost_3/1/4-10 ; "Alternate format for premium rate numbers." |
