What country is country code 708?

Some cities in California, including but not limited to:

Santa Rosa, Vallejo, American Canyon, Arcata, Benicia, Boyes Hot Springs, Clearlake, Cloverdale, Cotati, Dixon, Eureka, Fairfield, Fort Bragg, Fortuna, Healdsburg, McKinleyville, Napa, Petaluma, Rohnert Park, Sebastopol, Sonoma, Suisun City, Ukiah, Vacaville, and Windsor, according to areacodelocations.info.

North American area code 707 is a California telephone area code which covers Napa,

Sebastopol, Vallejo, Benicia, Fairfield, Santa Rosa, Petaluma, Fort Bragg, Crescent City, Eureka, Clearlake, Vacaville, Ukiah, and northwestern California. It was split from area code 415 on March 1, 1959. It has retained the same coverage area since then (except that the town of Dixon moved from 916 to 707 in 1997), making it by far the longest-lasting area code in California.