Area code 831
Area code 831 is a California telephone area code that was split from area code 408 on July 11, 1998.

It covers Monterey County, San Benito County, and Santa Cruz County.

Regions include Big Sur, Monterey Bay, the Salinas Valley, and the southwestern Santa Cruz Mountains.

Places in the 831 area code
Major cities within Area code 831 include: Salinas, Hollister, Monterey, Santa Cruz and the northern Central Coast.

Monterey County

 Aromas
 Boronda
 Carmel Highlands
 Carmel Valley Village
 Carmel-by-the-Sea
 Castroville
 Chualar
 Del Monte Forest
 Del Rey Oaks
 Elkhorn
 Gonzales
 Gorda
 Greenfield
 Jolon
 King City
 Las Lomas
 Lockwood
 Lucia
 Marina
 Monterey
 Moss Landing
 Pacific Grove
 Pajaro
 Pebble Beach
 Prunedale
 Salinas
 San Ardo
 San Lucas
 Sand City
 Seaside
 Soledad
 Spreckels

San Benito County

 Aromas
 Hollister
 New Idria
 Paicines
 Panoche
 Ridgemark
 San Juan Bautista
 Tres Pinos

Santa Cruz County

 Amesti
 Aptos Hills-Larkin Valley
 Aptos
 Ben Lomond
 Bonny Doon
 Boulder Creek
 Brookdale
 Capitola
 Corralitos
 Davenport
 Day Valley
 Felton
 Freedom
 Interlaken
 Live Oak
 Lompico
 Mount Hermon
 Opal Cliffs
 Pasatiempo
 Rio del Mar
 Santa Cruz
 Scotts Valley
 Soquel
 Summit
 Swanton
 Twin Lakes
 Watsonville