ILLINOIS BELL TEL CO
257 prefixes in 773 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 773-795 | CHICGOZN07 | 9329 | — | — |
| 773-801 | CHICGOZN06 | 9329 | 2006-05-19 | Yes |
| 773-804 | CHICGOZN05 | 9329 | — | Yes |
| 773-821 | CHICGOZN10 | 9329 | — | — |
| 773-825 | CHICGOZN11 | 9329 | — | Yes |
| 773-826 | CHICGOZN06 | 9329 | — | — |
| 773-832 | CHICGOZN04 | 9329 | — | Yes |
| 773-834 | CHICGOZN07 | 9329 | — | — |
| 773-836 | CHICGOZN05 | 9329 | — | Yes |
| 773-838 | CHICGOZN08 | 9329 | — | — |
| 773-843 | CHICGOZN06 | 9329 | — | — |
| 773-846 | CHICGOZN07 | 9329 | — | — |
| 773-847 | CHICGOZN06 | 9329 | — | — |
| 773-854 | CHICGOZN05 | 9329 | — | Yes |
| 773-862 | CHICGOZN04 | 9329 | — | Yes |
| 773-863 | CHICGOZN08 | 9329 | — | Yes |
| 773-864 | CHICGOZN03 | 9329 | — | Yes |
| 773-866 | CHICGOZN02 | 9329 | — | Yes |
| 773-867 | CHICGOZN03 | 9329 | — | Yes |
| 773-868 | CHICGOZN04 | 9329 | — | Yes |
| 773-869 | CHICGOZN06 | 9329 | — | Yes |
| 773-871 | CHICGOZN04 | 9329 | — | — |
| 773-873 | CHICGOZN07 | 9329 | — | Yes |
| 773-874 | CHICGOZN07 | 9329 | — | — |
| 773-878 | CHICGOZN02 | 9329 | — | — |
| 773-880 | CHICGOZN04 | 9329 | — | — |
| 773-881 | CHICGOZN10 | 9329 | — | — |
| 773-883 | CHICGOZN04 | 9329 | — | — |
| 773-884 | CHICGOZN08 | 9329 | — | — |
| 773-889 | CHICGOZN05 | 9329 | — | — |
| 773-890 | CHICGOZN06 | 9329 | — | — |
| 773-892 | CHICGOZN07 | 9329 | — | Yes |
| 773-894 | CHICGOZN11 | 9329 | — | — |
| 773-907 | CHICGOZN02 | 9329 | — | — |
| 773-918 | CHICGOZN08 | 9329 | — | Yes |
| 773-921 | CHICGOZN05 | 9329 | — | Yes |
| 773-924 | CHICGOZN07 | 9329 | — | — |
| 773-925 | CHICGOZN08 | 9329 | — | — |
| 773-926 | CHICGOZN07 | 9329 | — | — |
| 773-927 | CHICGOZN06 | 9329 | — | — |
| 773-928 | CHICGOZN10 | 9329 | — | — |
| 773-929 | CHICGOZN04 | 9329 | — | — |
| 773-933 | CHICGOZN09 | 9329 | — | — |
| 773-935 | CHICGOZN04 | 9329 | — | — |
| 773-947 | CHICGOZN07 | 9329 | — | Yes |
| 773-955 | CHICGOZN07 | 9329 | — | Yes |
| 773-961 | CHICGOZN02 | 9329 | — | Yes |
| 773-962 | CHICGOZN07 | 9329 | — | Yes |
| 773-973 | CHICGOZN02 | 9329 | — | — |
| 773-975 | CHICGOZN04 | 9329 | — | — |
| 773-978 | CHICGOZN09 | 9329 | — | — |
| 773-980 | CHICGOZN10 | 9329 | 2008-05-15 | Yes |
| 773-989 | CHICGOZN02 | 9329 | — | — |
| 773-990 | CHICGOZN03 | 9329 | 2006-03-20 | Yes |
| 773-992 | CHICGOZN03 | 9329 | — | Yes |
| 773-994 | CHICGOZN07 | 9329 | — | — |
| 773-995 | CHICGOZN10 | 9329 | — | — |
These are initial assignees from NANPA CO-code records — because of number portability, the current serving carrier of individual numbers may differ. Bulk export requires a membership.