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Area Codes in EUREKA Info
| Area Code: | EUREKA |
| States: | California, Illinois, Kansas, Missouri, Montana, Nevada, South Dakota |
| Cities: | Eureka |
Exchanges in Area Code EUREKA
| Exchange | State | County | City |
| 775-237 | Nevada | Eureka | Eureka |
| 775-254 | Nevada | Eureka | Eureka |
| 707-267 | California | Humboldt | Eureka |
| 707-268 | California | Humboldt | Eureka |
| 707-269 | California | Humboldt | Eureka |
| 775-270 | Nevada | Eureka | Eureka |
| 605-284 | South Dakota | Mcpherson | Eureka |
| 605-289 | South Dakota | Mcpherson | Eureka |
| 406-296 | Montana | Lincoln | Eureka |
| 406-297 | Montana | Lincoln | Eureka |
| 309-304 | Illinois | Woodford | Eureka |
| 775-318 | Nevada | Eureka | Eureka |
| 707-362 | California | Humboldt | Eureka |
| 775-367 | Nevada | Eureka | Eureka |
| 605-379 | South Dakota | Mcpherson | Eureka |
| 707-407 | California | Humboldt | Eureka |
| 707-440 | California | Humboldt | Eureka |
| 707-441 | California | Humboldt | Eureka |
| 707-442 | California | Humboldt | Eureka |
| 707-443 | California | Humboldt | Eureka |
| 707-444 | California | Humboldt | Eureka |
| 707-445 | California | Humboldt | Eureka |
| 309-466 | Illinois | Woodford | Eureka |
| 309-467 | Illinois | Woodford | Eureka |
| 707-476 | California | Humboldt | Eureka |
| 707-496 | California | Humboldt | Eureka |
| 707-497 | California | Humboldt | Eureka |
| 707-498 | California | Humboldt | Eureka |
| 707-499 | California | Humboldt | Eureka |
| 707-502 | California | Humboldt | Eureka |
| 775-522 | Nevada | Eureka | Eureka |
| 636-549 | Missouri | Saint Louis | Eureka |
| 775-551 | Nevada | Eureka | Eureka |
| 605-577 | South Dakota | Mcpherson | Eureka |
| 620-583 | Kansas | Greenwood | Eureka |
| 636-587 | Missouri | Saint Louis | Eureka |
| 707-599 | California | Humboldt | Eureka |
| 707-601 | California | Humboldt | Eureka |
| 707-616 | California | Humboldt | Eureka |
| 707-618 | California | Humboldt | Eureka |
| 775-640 | Nevada | Eureka | Eureka |
| 707-672 | California | Humboldt | Eureka |
| 605-687 | South Dakota | Mcpherson | Eureka |
| 620-750 | Kansas | Greenwood | Eureka |
| 707-832 | California | Humboldt | Eureka |
| 707-834 | California | Humboldt | Eureka |
| 707-845 | California | Humboldt | Eureka |
| 620-853 | Kansas | Greenwood | Eureka |
| 775-863 | Nevada | Eureka | Eureka |
| 406-882 | Montana | Lincoln | Eureka |
| 406-889 | Montana | Lincoln | Eureka |
| 636-938 | Missouri | Saint Louis | Eureka |
| 620-953 | Kansas | Greenwood | Eureka |
| 707-999 | California | Humboldt | Eureka |