All assignees
800 prefixes in 773 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 773-900 | CHICGOZN03 | 965H | 2019-08-19 | Yes |
| 773-901 | CHICGOZN10 | 6534 | 2009-05-15 | Yes |
| 773-902 | CHICGOZN09 | 6115 | — | Yes |
| 773-903 | CHICGOZN06 | 224C | 2025-08-14 | Yes |
| 773-904 | CHICGOZN04 | 6115 | 2008-05-12 | Yes |
| 773-905 | CHICGOZN10 | 6115 | — | Yes |
| 773-906 | CHICGOZN11 | 6115 | — | Yes |
| 773-907 | CHICGOZN02 | 9329 | — | — |
| 773-908 | CHICGOZN01 | 6529 | — | — |
| 773-909 | CHICGOZN01 | 6333 | — | — |
| 773-910 | CHICGOZN01 | 6534 | — | — |
| 773-911 | XXXXXXXXXX | MULT | — | — |
| 773-912 | CHICGOZN08 | 6115 | — | Yes |
| 773-913 | CHICGOZN09 | 6115 | — | Yes |
| 773-914 | CHICGOZN01 | 6333 | — | Yes |
| 773-915 | CHICGOZN07 | 6115 | — | Yes |
| 773-916 | CHICGOZN06 | 6529 | 2010-08-31 | Yes |
| 773-917 | CHICGOZN11 | 7196 | — | Yes |
| 773-918 | CHICGOZN08 | 9329 | — | Yes |
| 773-919 | CHICGOZN01 | 6333 | — | — |
| 773-920 | CHICGOZN06 | 6115 | — | Yes |
| 773-921 | CHICGOZN05 | 9329 | — | Yes |
| 773-922 | CHICGOZN05 | 6115 | — | Yes |
| 773-923 | CHICGOZN03 | 6534 | 2020-05-01 | 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 | — | — |
| 773-930 | CHICGOZN03 | 6529 | 2007-01-08 | Yes |
| 773-931 | CHICGOZN10 | 6529 | 2001-05-23 | — |
| 773-932 | CHICGOZN03 | 6115 | — | Yes |
| 773-933 | CHICGOZN09 | 9329 | — | — |
| 773-934 | CHICGOZN03 | 6529 | 2002-08-21 | — |
| 773-935 | CHICGOZN04 | 9329 | — | — |
| 773-936 | CHICGOZN07 | 6529 | 2001-08-30 | — |
| 773-937 | CHICGOZN08 | 8702 | — | Yes |
| 773-938 | CHICGOZN04 | 6115 | — | Yes |
| 773-939 | CHICGOZN08 | 6529 | 2007-02-21 | Yes |
| 773-940 | CHICGOZN06 | 318J | 2008-11-17 | Yes |
| 773-941 | CHICGOZN10 | 6529 | 2007-11-27 | Yes |
| 773-942 | CHICGOZN02 | 6115 | — | Yes |
| 773-943 | CHICGOZN02 | 6529 | 2010-09-03 | Yes |
| 773-944 | CHICGOZN02 | 8702 | — | — |
| 773-945 | CHICGOZN05 | 063E | 2008-06-25 | Yes |
| 773-946 | CHICGOZN10 | 6115 | 2007-05-22 | Yes |
| 773-947 | CHICGOZN07 | 9329 | — | Yes |
| 773-948 | CHICGOZN08 | 7229 | — | Yes |
| 773-949 | CHICGOZN03 | 6529 | 2011-02-24 | Yes |
| 773-950 | — | — | ||
| 773-951 | CHICGOZN03 | 6333 | 2006-10-16 | Yes |
| 773-952 | CHICGOZN07 | 6529 | 2007-06-14 | Yes |
| 773-953 | CHICGOZN03 | 6529 | 2007-08-29 | Yes |
| 773-954 | CHICGOZN10 | 6529 | 2005-09-30 | Yes |
| 773-955 | CHICGOZN07 | 9329 | — | Yes |
| 773-956 | CHICGOZN06 | 6529 | 2008-09-04 | Yes |
| 773-957 | CHICGOZN03 | 829J | — | Yes |
| 773-958 | — | — | ||
| 773-959 | — | — | ||
| 773-960 | CHICGOZN03 | 6529 | — | Yes |
| 773-961 | CHICGOZN02 | 9329 | — | Yes |
| 773-962 | CHICGOZN07 | 9329 | — | Yes |
| 773-963 | CHICGOZN03 | 6529 | 2007-07-17 | Yes |
| 773-964 | CHICGOZN10 | 6529 | 2007-08-21 | Yes |
| 773-965 | CHICGOZN01 | 6333 | — | Yes |
| 773-966 | CHICGOZN07 | 6115 | 2006-04-27 | Yes |
| 773-967 | CHICGOZN09 | 7229 | — | Yes |
| 773-968 | CHICGOZN03 | 6529 | 2001-02-12 | — |
| 773-969 | CHICGOZN04 | 6529 | 2008-01-07 | Yes |
| 773-970 | CHICGOZN10 | 6534 | 2009-05-15 | Yes |
| 773-971 | CHICGOZN10 | 6529 | 2007-07-11 | Yes |
| 773-972 | CHICGOZN01 | 6534 | — | — |
| 773-973 | CHICGOZN02 | 9329 | — | — |
| 773-974 | CHICGOZN11 | 829J | — | Yes |
| 773-975 | CHICGOZN04 | 9329 | — | — |
| 773-976 | — | — | ||
| 773-977 | CHICGOZN02 | 829J | — | Yes |
| 773-978 | CHICGOZN09 | 9329 | — | — |
| 773-979 | CHICGOZN10 | 6529 | 2006-06-08 | Yes |
| 773-980 | CHICGOZN10 | 9329 | 2008-05-15 | Yes |
| 773-981 | CHICGOZN10 | 7229 | — | Yes |
| 773-982 | CHICGOZN10 | 6529 | 2008-02-29 | Yes |
| 773-983 | CHICGOZN10 | 6529 | 2002-03-28 | — |
| 773-984 | CHICGOZN03 | 6529 | 2007-03-15 | Yes |
| 773-985 | CHICGOZN11 | 7229 | — | Yes |
| 773-986 | CHICGOZN08 | 6529 | 2007-10-16 | Yes |
| 773-987 | CHICGOZN10 | 460K | 2005-03-28 | Yes |
| 773-988 | CHICGOZN01 | 6529 | — | — |
| 773-989 | CHICGOZN02 | 9329 | — | — |
| 773-990 | CHICGOZN03 | 9329 | 2006-03-20 | Yes |
| 773-991 | CHICGOZN03 | 6529 | — | Yes |
| 773-992 | CHICGOZN03 | 9329 | — | Yes |
| 773-993 | CHICGOZN03 | 6529 | 2011-02-18 | Yes |
| 773-994 | CHICGOZN07 | 9329 | — | — |
| 773-995 | CHICGOZN10 | 9329 | — | — |
| 773-996 | CHICGOZN08 | 6529 | 2007-10-16 | Yes |
| 773-997 | CHICGOZN02 | 6529 | 2008-10-28 | Yes |
| 773-998 | CHICGOZN10 | 6534 | 2009-05-15 | Yes |
| 773-999 | CHICGOZN05 | 6534 | 2009-05-15 | Yes |
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.