NRNumberResearch Membership · Data 09/17/2026

← Area code 773

All assignees

800 prefixes in 773 · initial assignments from the NANPA CO code file, 09/17/2026

Prefixes held by all assignees in area code 773
NPA-NXXRate centerOCNAssignedPooled
773-300 CHICGOZN05 224C 2023-06-15 Yes
773-301 CHICGOZN03 6529 — Yes
773-302 CHICGOZN02 6529 2009-02-26 Yes
773-303 CHICGOZN02 7229 — Yes
773-304 CHICGOZN03 7229 — Yes
773-305 CHICGOZN04 7229 — Yes
773-306 CHICGOZN08 7136 — Yes
773-307 CHICGOZN01 6534 — —
773-308 CHICGOZN03 460K — Yes
773-309 CHICGOZN05 829J — Yes
773-310 CHICGOZN10 6529 2004-03-22 Yes
773-311 XXXXXXXXXX MULT — —
773-312 CHICGOZN02 6529 — Yes
773-313 CHICGOZN02 7229 — Yes
773-314 CHICGOZN03 7229 — Yes
773-315 CHICGOZN01 6534 — —
773-316 CHICGOZN01 6534 — —
773-317 CHICGOZN01 6529 — Yes
773-318 CHICGOZN03 6333 2004-09-07 Yes
773-319 CHICGOZN10 6529 — Yes
773-320 CHICGOZN01 6534 — —
773-321 CHICGOZN06 6115 — Yes
773-322 CHICGOZN07 6529 — Yes
773-323 CHICGOZN02 9748 2001-04-16 —
773-324 CHICGOZN07 9329 — —
773-325 CHICGOZN04 9329 — —
773-326 CHICGOZN07 6115 — Yes
773-327 CHICGOZN04 9329 — —
773-328 CHICGOZN04 460K — Yes
773-329 CHICGOZN03 7136 — Yes
773-330 CHICGOZN01 6534 — —
773-331 CHICGOZN03 6529 — Yes
773-332 CHICGOZN03 6333 — Yes
773-333 CHICGOZN02 9748 2001-04-16 —
773-334 CHICGOZN02 9329 — —
773-335 CHICGOZN09 6534 2024-12-19 Yes
773-336 CHICGOZN09 460K — Yes
773-337 CHICGOZN11 7229 — Yes
773-338 CHICGOZN02 9329 — —
773-339 CHICGOZN01 6333 — —
773-340 CHICGOZN08 224C — Yes
773-341 CHICGOZN10 460K — Yes
773-342 CHICGOZN04 9329 — —
773-343 CHICGOZN01 6333 — —
773-344 CHICGOZN10 7229 — Yes
773-345 CHICGOZN05 7229 — Yes
773-346 CHICGOZN06 7229 — Yes
773-347 CHICGOZN07 7229 — Yes
773-348 CHICGOZN04 9329 — —
773-349 CHICGOZN08 7229 — Yes
773-350 CHICGOZN01 6333 — —
773-351 CHICGOZN01 6534 — —
773-352 CHICGOZN03 224C 2021-07-01 Yes
773-353 CHICGOZN03 6115 — Yes
773-354 CHICGOZN01 6529 — Yes
773-355 CHICGOZN03 829J 2001-04-12 Yes
773-356 CHICGOZN09 9329 — —
773-357 CHICGOZN11 460K — Yes
773-358 CHICGOZN07 7229 — Yes
773-359 CHICGOZN09 7229 — Yes
773-360 CHICGOZN04 6115 — Yes
773-361 CHICGOZN07 9329 — —
773-362 CHICGOZN08 829J — Yes
773-363 CHICGOZN07 9329 — —
773-364 CHICGOZN09 829J 2001-04-12 Yes
773-365 CHICGOZN04 7229 — Yes
773-366 CHICGOZN10 6529 2004-09-24 Yes
773-367 CHICGOZN03 6529 2009-02-13 Yes
773-368 CHICGOZN03 6529 — Yes
773-369 CHICGOZN01 6534 — —
773-370 CHICGOZN01 6529 — Yes
773-371 CHICGOZN07 9329 — Yes
773-372 CHICGOZN03 6333 2008-07-07 Yes
773-373 CHICGOZN07 9329 — Yes
773-374 CHICGOZN09 9329 — —
773-375 CHICGOZN09 9329 — —
773-376 CHICGOZN06 9329 — —
773-377 CHICGOZN11 7136 — Yes
773-378 CHICGOZN05 9329 — Yes
773-379 CHICGOZN05 9329 — Yes
773-380 CHICGOZN03 9329 — Yes
773-381 CHICGOZN02 9329 — —
773-382 CHICGOZN09 829J 2001-04-12 Yes
773-383 CHICGOZN03 6534 — —
773-384 CHICGOZN04 9329 — —
773-385 CHICGOZN05 9329 — —
773-386 CHICGOZN01 6529 — Yes
773-387 CHICGOZN10 6529 2004-06-09 Yes
773-388 CHICGOZN04 9329 — —
773-389 CHICGOZN09 984E — Yes
773-390 CHICGOZN01 6333 — Yes
773-391 CHICGOZN01 6534 — —
773-392 CHICGOZN01 6529 — Yes
773-393 CHICGOZN01 6630 — —
773-394 CHICGOZN04 9329 — Yes
773-395 CHICGOZN04 9329 — Yes
773-396 CHICGOZN10 829J 2001-04-12 Yes
773-397 CHICGOZN03 6534 2009-03-10 Yes
773-398 CHICGOZN03 6529 — Yes
773-399 CHICGOZN03 9329 — 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.