Approx. 81,500 farms operated in California, less than 4% of the national total. More than 23% of California farms produced commodity sales totaling $100,000, compared with 17% for the U.S. as a whole. Lands devoted to farming and ranching totaled 25.4 million acres in recent years measured. Both the California and U.S. average farm size remained steady from the previous year at 312 and 418 acres, respectively.

California leads nation, producing 99% of this product
Almonds
Artichokes
Dates
Figs
Grapes, Raisins
Kiwifruit
Olives
Peaches, Clingstone
Pistachios
Plums, Dried
Pomegranates
Rice, Sweet
Seed, Ladino Clover
Walnuts

California leads the nation in this:

Almonds Escarole/Endive Limes Pigeons & Squabs
Apricots Figs Mandarins and Mandarin Hybrids 2 Pistachios
Artichokes Flowers, Bulbs Melons, Cantaloupe Plums
Asparagus Flowers, Cut Melons, Honeydew Plums, Dried
Avocados Flowers, Potted Plants Milk Pluots
Beans, Dry Lima Garlic Milk Goats Pomegranates
Bedding/Garden Plants Grapes, Raisins Nectarines Raspberries
Broccoli Grapes, Table Nursery, Bedding Plants Rice, Sweet
Brussels Sprouts Grapes, Wine Nursery Crops Safflower
Cabbage, Chinese Greens, Mustard Olives Seed, Alfalfa
Cabbage, F.M. Hay, Alfalfa Onions, Dry Seed, Bermuda Grass
Carrots Herbs Onions, Green Seed, Ladino Clover
Cauliflower Kale Parsley Seed, Vegetable and Flower
Celery Kiwifruit Peaches, Clingstone Spinach
Chicory Kumquats Peaches, Freestone Strawberries
Cotton, American Pima Lemons Pears, Bartlett Tomatoes, Processing
Daikon Lettuce, Head Peppers, Chile Vegetables, Greenhouse
Dates Lettuce, Leaf Peppers, Bell Vegetables, Oriental
Eggplant Lettuce, Romaine Persimmons Walnuts
Wild Rice California Farming and Certified Organic Foods

Here are the latest farm statistics as to what counties bring home the bacon: https://www.cdfa.ca.gov/Statistics/

Counties with more than $2 billion farming in 2015 -- the latest statistics available in 2017

#1 Tulare $6,980,772,000 (close to $7 billion) Milk, Cattle & Calves, Oranges, Grapes (Table) *Cities: Dinuba | Exeter | Lindsay | Porterville | Tulare | Visalia | Woodlake | Town of Springville

#2 Kern $6,878,664,000 Almonds, Grapes (Table), Milk, Tangerines *Cities: Arvin | Bakersfield | California City | Delano | Maricopa | McFarland | Ridgecrest |
Shafter | Taft | Tehachapi | Wasco

#3 Fresno $6,605,943,000 Almonds, Poultry, Grapes (Raisin), Milk *Cities: Clovis | Coalinga | Firebaugh | Fowler |Fresno | Huron | Kerman | Kingsburg | Mendota |
Orange Cove | Parlier | Reedley | San Joaquin | Sanger | Selma

#4 Monterey $4,841,519,000 Strawberries, Lettuce, Broccoli, Cauliflower *Cities: Carmel-by-the-Sea | Del Rey Oaks | Gonzales | Greenfield | King City | Marina | Monterey | Pacific Grove | Salinas | Sand City | Seaside | Soledad

#5 Stanislaus $3,879,333,000 Almonds, Milk, Chickens, Walnuts *Cities: Ceres | Hughson | Modesto | Newman | Oakdale | Patterson | Riverbank | Turlock | Waterford

#6 Merced $3,589,900,000 Milk, Almonds, Chickens, Cattle & Calves *Cities: Atwater | Dos Palos | Gustine | Livingston | Los Banos | Merced

#7 San Joaquin $2,732,900,000 Almonds, Milk, Grapes -Wine, Walnuts *Cities: Escalon | Lathrop | Lodi | Manteca | Ripon | Stockton | Tracy

#8 Ventura $2,198,555,000 Strawberries, Lemons, Raspberries, Celery *Cities: Camarillo | Fillmore | Moorpark | Ojai | Oxnard | Port Hueneme | Santa Paula | Simi Valley | Thousand Oaks | Ventura

#9 Kings $2,021,052,000 Milk, Cattle & Calves, Almonds, Cotton-Pima *Cities: Avenal | Corcoran | Hanford | Lemoore

#10 Madera $2,016,726,000 Almonds, Milk, Pistachios, Grapes -Wine * Cities: Chowchilla | Madera