| American Dark Fiber LLC | ADFIBR | All counties in California | California | Alameda, Alpine, Amador, Butte, Calaveras, Colusa, Contra Costa, Del Norte, El Dorado, Fresno, Glenn, Humboldt, Imperial, Inyo, Kern, Kings, Lake, Lassen, Los Angeles, Madera, Marin, Mariposa, Mendocino, Merced, Modoc, Mono, Monterey, Napa, Nevada, Orange, Placer, Plumas, Riverside, Sacramento, San Benito, San Bernardino, San Diego, San Francisco, San Joaquin, San Luis Obispo, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Shasta, Sierra, Siskiyou, Solano, Sonoma, Stanislaus, Sutter, Tehama, Trinity, Tulare, Tuolumne, Ventura, Yolo, Yuba |
| Arium Networks | ARIUMCA | All of California | California | Alameda, Alpine, Amador, Butte, Calaveras, Colusa, Contra Costa, Del Norte, El Dorado, Fresno, Glenn, Humboldt, Imperial, Inyo, Kern, Kings, Lake, Lassen, Los Angeles, Madera, Marin, Mariposa, Mendocino, Merced, Modoc, Mono, Monterey, Napa, Nevada, Orange, Placer, Plumas, Riverside, Sacramento, San Benito, San Bernardino, San Diego, San Francisco, San Joaquin, San Luis Obispo, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Shasta, Sierra, Siskiyou, Solano, Sonoma, Stanislaus, Sutter, Tehama, Trinity, Tulare, Tuolumne, Ventura, Yolo, Yuba |
| Astound Broadband California | ASTBCA | All of California | California | Alameda, Alpine, Amador, Butte, Calaveras, Colusa, Contra Costa, Del Norte, El Dorado, Fresno, Glenn, Humboldt, Imperial, Inyo, Kern, Kings, Lake, Lassen, Los Angeles, Madera, Marin, Mariposa, Mendocino, Merced, Modoc, Mono, Monterey, Napa, Nevada, Orange, Placer, Plumas, Riverside, Sacramento, San Benito, San Bernardino, San Diego, San Francisco, San Joaquin, San Luis Obispo, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Shasta, Sierra, Siskiyou, Solano, Sonoma, Stanislaus, Sutter, Tehama, Trinity, Tulare, Tuolumne, Ventura, Yolo, Yuba |
| AT&T California | ATTCA | All of California | California | Alameda, Alpine, Amador, Butte, Calaveras, Colusa, Contra Costa, Del Norte, El Dorado, Fresno, Glenn, Humboldt, Imperial, Inyo, Kern, Kings, Lake, Lassen, Los Angeles, Madera, Marin, Mariposa, Mendocino, Merced, Modoc, Mono, Monterey, Napa, Nevada, Orange, Placer, Plumas, Riverside, Sacramento, San Benito, San Bernardino, San Diego, San Francisco, San Joaquin, San Luis Obispo, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Shasta, Sierra, Siskiyou, Solano, Sonoma, Stanislaus, Sutter, Tehama, Trinity, Tulare, Tuolumne, Ventura, Yolo, Yuba |
| BIF IV intrepid Opco, LLC | INTPID | All of California | California | Alameda, Alpine, Amador, Butte, Calaveras, Colusa, Contra Costa, Del Norte, El Dorado, Fresno, Glenn, Humboldt, Imperial, Inyo, Kern, Kings, Lake, Lassen, Los Angeles, Madera, Marin, Mariposa, Mendocino, Merced, Modoc, Mono, Monterey, Napa, Nevada, Orange, Placer, Plumas, Riverside, Sacramento, San Benito, San Bernardino, San Diego, San Francisco, San Joaquin, San Luis Obispo, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Shasta, Sierra, Siskiyou, Solano, Sonoma, Stanislaus, Sutter, Tehama, Trinity, Tulare, Tuolumne, Ventura, Yolo, Yuba |
| Charter Communications | CHRTRS | Charter Communications Southern California - Imperial, Kern, Los Angeles, Riverside, San Bernardino, San Diego, Santa Barbara, Orange, Ventura Counties | California | Imperial, Kern, Los Angeles, Orange, Riverside, San Bernardino, San Diego, Santa Barbara, Ventura |
| City of Gilroy | GILROY | City of Gilroy | California | Santa Clara |
| City of Santa Clara | NPSACL | AT&T Non-Participating code for
City of Santa Clara | California | Santa Clara |
| Cityside Fiber | CTYSDE | All of California | California | Alameda, Alpine, Amador, Butte, Calaveras, Colusa, Contra Costa, Del Norte, El Dorado, Fresno, Glenn, Humboldt, Imperial, Inyo, Kern, Kings, Lake, Lassen, Los Angeles, Madera, Marin, Mariposa, Mendocino, Merced, Modoc, Mono, Monterey, Napa, Nevada, Orange, Placer, Plumas, Riverside, Sacramento, San Benito, San Bernardino, San Diego, San Francisco, San Joaquin, San Luis Obispo, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Shasta, Sierra, Siskiyou, Solano, Sonoma, Stanislaus, Sutter, Tehama, Trinity, Tulare, Tuolumne, Ventura, Yolo, Yuba |
| Clear Connection - California | CCONCA | California - El Dorado, Shasta and Tehama counties | California | El Dorado, Shasta, Tehama |
| Comcast California | COMCAL | | California | Alameda, Amador, Butte, Calaveras, Colusa, Contra Costa, El Dorado, Fresno, Glenn, Kings, Madera, Marin, Mendocino, Merced, Monterey, Napa, Nevada, Placer, Sacramento, San Benito, San Francisco, San Joaquin, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Solano, Sonoma, Stanislaus, Tulare, Tuolumne, Yolo, Yuba |
| Cox Communications LLC | COXSCA | Santa Barbara, Los Angeles, Orange, and San Diego | California | Los Angeles, Orange, San Diego, Santa Barbara |
| CVIN, LLC | CVINCA | CVIN, LLC
CALIFORNIA. COUNTIES: Calaveras, Colusa, Fresno, Madera, Merced, Tulare. | California | Calaveras, Colusa, Fresno, Madera, Merced, Tulare |
| Extenet Systems | XNETCA | State of California
California counties :
Alameda ,
Contra Costa
Los Angeles
Marin
Mendocino
Monterey
Oakland
Orange
Riverside
San Bernardino
San Diego
San Fernando,
San Francisco
San Luis Obispo
San Mateo
Santa Clara
Santa Cruz
Ventura | California | Alameda, Contra Costa, Los Angeles, Marin, Mendocino, Monterey, Orange, Riverside, San Bernardino, San Diego, San Francisco, San Mateo, Santa Clara, Santa Cruz |
| Fidium f/k/a Consolidated Communications | FIDICA | Greater Sacramento Area: Sacramento County, El Dorado County, Placer County, Yolo County, | California | El Dorado, Placer, Sacramento, Yolo |
| FJS Cable Engineering Inc | FJSCBE | California, USA | California | Alameda, Alpine, Amador, Butte, Calaveras, Colusa, Contra Costa, Del Norte, El Dorado, Fresno, Glenn, Humboldt, Imperial, Inyo, Kern, Kings, Lake, Lassen, Los Angeles, Madera, Marin, Mariposa, Mendocino, Merced, Modoc, Mono, Monterey, Napa, Nevada, Orange, Placer, Plumas, Riverside, Sacramento, San Benito, San Bernardino, San Diego, San Francisco, San Joaquin, San Luis Obispo, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Shasta, Sierra, Siskiyou, Solano, Sonoma, Stanislaus, Sutter, Tehama, Trinity, Tulare, Tuolumne, Ventura, Yolo, Yuba |
| Healdsburg Electric | HELDEL | City of Healdsburg, Sonoma County, CA | California | Sonoma |
| Imperial Irrigation District | NPIID | AT&T Non-Participating code for Imperial Irrigation District
Imperial Valley, Coachella Valley | California | Imperial, Riverside |
| Inyo Networks California | INYOCA | Mono, Inyo, Kern, San Bernardino, San Diego, Riverside counties | California | Inyo, Kern, Mono, Riverside, San Bernardino, San Diego |
| Liberty Utilities | NPLIBU | AT&T Non-Participating code for Liberty Utilities
Compton, Bellflower, Lynwood, Norwalk, Bell Gardens, Santa Fe Springs, Artesia, Willowbrook, LA County, Apple Valley, Rancho Dominguez, San Bernardino County, Yermo, Victorville | California | Los Angeles |
| Lit San Leandro, LLC | LITSAN | Alameda County, Bay Area, Ca. | California | Alameda |
| MCC Telephony of the West | MCCTEL | San Diego, Riverside, Kern, San Bernardino (small section in Ridgecrest) | California | Kern, Riverside, San Bernardino, San Diego |
| Mediacom | MDCMCA | Lake County | California | Lake |
| Optimum | OPTICA | Truckee, Auburn, Meadow Vista, Alta Serria. Nevada & Placer county | California | Nevada, Placer |
| PacifiCorp | PPLCA | PT/PA All Pacific Power Regions in California
-Del Norte County - Crescent City, Fort Dick, Gasquet, Klamath, Requa, Smith River
- Modoc County – Alturas. Canby, Cedarville, Davis Creek, Fort Bidwell, Lake City, Newell, Perez, Tionesta, Tulelake, Willow Ranch
- Siskiyou County – Boswick, Bray, Callahan, Cecilville, Clear Creek, Copco, Dear Horse, Dorris, Dunsmuir, Etna, Forks of Salmon, Fort Jones, Gazelle, Greenview, Grenada, Hamburg, Happy Camp, Hilt, Hornbrock, Horse Creek, Klamath River, Macdoel, McCloud, Montague, Mount Hebron, Mount Shasta, Sawyers Bar, Seiad Valley, Tennant, Weed, Yreka
-Shasta County - Big Bend, Castella, La Moine, Lakehead, Lamoine
-Trinity County – Denny, Trinity Center | California | Del Norte, Modoc, Shasta, Siskiyou, Trinity |
| Plumas-Sierra Rural Electric Cooperative | PSECCA | Plumas, Sierra, Lassen counties | California | Lassen, Plumas, Sierra |
| Ponderosa Telephone | PONDTEL | Fresno, Madera | California | Fresno, Madera |
| Race Communications | RACECOM | All of California | California | Alameda, Alpine, Amador, Butte, Calaveras, Colusa, Contra Costa, Del Norte, El Dorado, Fresno, Glenn, Humboldt, Imperial, Inyo, Kern, Kings, Lake, Lassen, Los Angeles, Madera, Marin, Mariposa, Mendocino, Merced, Modoc, Mono, Monterey, Napa, Nevada, Orange, Placer, Plumas, Riverside, Sacramento, San Benito, San Bernardino, San Diego, San Francisco, San Joaquin, San Luis Obispo, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Shasta, Sierra, Siskiyou, Solano, Sonoma, Stanislaus, Sutter, Tehama, Trinity, Tulare, Tuolumne, Ventura, Yolo, Yuba |
| San Diego Gas & Electric - Distribution | NPSGED | AT&T Non-Participating code for San Diego Gas & Electric
San Diego County, Orange County | California | Orange, San Diego |
| San Diego Gas & Electric - Transmission | NPSGET | AT&T Non-Participating code for San Diego Gas & Electric
San Diego County, Orange County | California | Orange |
| Sierra Nevada Communications, Inc | SIERRA | Tuolumne County | California | Tuolumne |
| Silicon Valley Power | SILCON | City of Santa Clara, Santa Clara County | California | Santa Clara |
| Sonic Telecom LLC. | SONCANO | Alameda, Contra Costa, Lake, Marin, Mendocino, Napa, Sacramento, San Francisco, San Joaquin, San Mateo, Santa Clara, Santa Cruz, Solano, Sonoma | California | Alameda, Contra Costa, Lake, Marin, Mendocino, Napa, Sacramento, San Francisco, San Joaquin, San Mateo, Santa Clara, Santa Cruz, Solano, Sonoma |
| Sonic Telecom LLC. | SONCASO | Los Angeles, Orange, Riverside, San Bernardino, San Diego, Ventura | California | Los Angeles, Orange, Riverside, San Bernardino, San Diego, Ventura |
| Stimulus Technologies | STIMTCA | Inyo County | California | Inyo |
| Surfnet Communications, Inc | SURFNET | Monterey, San Luis Obispo, Santa Barbara, Santa Clara, Santa Cruz | California | Monterey, San Luis Obispo, Santa Barbara, Santa Clara, Santa Cruz |
| Tekify Fiber, LLC | TEKIFY | Alameda County | California | Alameda |
| Tel-One Network Services, Inc. | TELONE | San Francisco | California | San Francisco |
| Teleport Communications America, LLC (CA) | TCACA | all counties CA | California | Alameda, Alpine, Amador, Butte, Calaveras, Colusa, Contra Costa, Del Norte, El Dorado, Fresno, Glenn, Humboldt, Imperial, Inyo, Kern, Kings, Lake, Lassen, Los Angeles, Madera, Marin, Mariposa, Mendocino, Merced, Modoc, Mono, Monterey, Napa, Nevada, Orange, Placer, Plumas, Riverside, Sacramento, San Benito, San Bernardino, San Diego, San Francisco, San Joaquin, San Luis Obispo, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Shasta, Sierra, Siskiyou, Solano, Sonoma, Stanislaus, Sutter, Tehama, Trinity, Tulare, Tuolumne, Ventura, Yolo, Yuba |
| Ubiquity California LLC | UBIQTY | California - All counties | California | Alameda, Alpine, Amador, Butte, Calaveras, Colusa, Contra Costa, Del Norte, El Dorado, Fresno, Glenn, Humboldt, Imperial, Inyo, Kern, Kings, Lake, Lassen, Los Angeles, Madera, Marin, Mariposa, Mendocino, Merced, Modoc, Mono, Monterey, Napa, Nevada, Orange, Placer, Plumas, Riverside, Sacramento, San Benito, San Bernardino, San Diego, San Francisco, San Joaquin, San Luis Obispo, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Shasta, Sierra, Siskiyou, Solano, Sonoma, Stanislaus, Sutter, Tehama, Trinity, Tulare, Tuolumne, Ventura, Yolo, Yuba |
| Valley Electric Assoc | NPVEAC | AT&T Non-Participating code for Valley Electric Assoc (CA)
Mono, Inyo | California | Inyo, Mono |
| Vero Fiber Networks (CA) | VEROCA | Humboldt, Imperial, Lake, Mendocino counties | California | Humboldt, Imperial, Lake, Mendocino |
| Volcano Telephone Co. | VTELCO | Amador and Calaveras counties in California | California | Amador, Calaveras |
| Wyyerd Fiber | WYYERD | San Diego County | California | San Diego |
| Zayo Fiber Solutions | ZAYOCA | all counties - CA | California | Alameda, Alpine, Amador, Butte, Calaveras, Colusa, Contra Costa, Del Norte, El Dorado, Fresno, Glenn, Humboldt, Imperial, Inyo, Kern, Kings, Lake, Lassen, Los Angeles, Madera, Marin, Mariposa, Mendocino, Merced, Modoc, Mono, Monterey, Napa, Nevada, Orange, Placer, Plumas, Riverside, Sacramento, San Benito, San Bernardino, San Diego, San Francisco, San Joaquin, San Luis Obispo, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Shasta, Sierra, Siskiyou, Solano, Sonoma, Stanislaus, Sutter, Tehama, Trinity, Tulare, Tuolumne, Ventura, Yolo, Yuba |
| Zito California | ZITOCA | Shasta County, Plumas County, Lassen County, Kern County, Imperial County, San Diego County, Riverside County | California | Imperial, Kern, Lassen, Plumas, Riverside, San Diego, Shasta |