Stretching from the Oregon border on the north, to Mammoth Lakes on the south, the 1st Senate District has approximately 850,000 residents. It encompasses Alpine, Amador, Calaveras, El Dorado, Lassen, Modoc, Mono, Plumas and Sierra Counties, as well as portions of Nevada, Placer and Sacramento Counties.

It includes Lake Tahoe, the Plumas National Forest, the major ski resorts of California, and is home to many wineries throughout Amador, El Dorado and Calaveras Counties. The annual frog-jumping contest, made famous by Mark Twain, is held every year in this district.

The 1st Senate District includes the following cities and communities: Adin, Alleghany, Alta, Altaville, Alturas, Amador City, Angels Camp, Applegate, Arnold, Auburn, Avery, Beckwourth, Belden, Benton, Bieber, Blairsden-Graeagle, Bridgeport, Burson, Calpine, Camino, Campo Seco, Camptonville, Canby, Canyondam, Carmichael, Carnelian Bay, Cedarville, Chester, Chicago Park, Chilcoot, Clio, Coleville, Colfax, Coloma, Cool, Copperopolis, Crescent Mills, Davis Creek, Diamond Springs, Douglas Flat, Downieville, Doyle, Drytown, Dutch Flat, Eagleville, Echo Lake, El Dorado, El Dorado Hills, Elk Grove, Emigrant Gap, Fair Oaks, Fiddletown, Floriston, Folsom, Foresthill, Fort Bidwell, Galt, Garden Valley, Georgetown, Glencoe, Gold Run, Goodyears Bar, Granite Bay, Grass Valley, Greenville, Greenwood, Grizzly Flats, Hathaway Pines, Herald, Herlong, Homewood, Ione, Jackson, Janesville, June Lake, Kings Beach, Kirkwood, Kyburz, Lake City, Lee Vining, Likely, Litchfield, Lookout, Lotus, Loyalton, Madeline, Mammoth Lakes, Markleeville, Martell, Mather, McArthur, Meadow Valley, Meadow Vista, Milford, Mokelumne Hill, Mount Aukum, Mountain Ranch, Murphys, Norden, Nubieber, Olympic Valley, Orangevale, Pilot Hill, Pine Grove, Pioneer, Placerville, Plymouth, Pollock Pines, Portola, Quincy, Rail Road Flat, Rancho Cordova, Ravendale, Rescue, River Pines, Roseville, Sacramento, San Andreas, Sheep Ranch, Shingle Springs, Sierra City, Sierraville, Sloughhouse, Soda Springs, Somerset, South Lake Tahoe, Standish, Storrie, Strawberry Valley, Susanville, Sutter Creek, Tahoe City, Tahoe Vista, Tahoma, Taylorsville, Termo, Topaz, Truckee, Twain, Twin Bridges, Vallecito, Valley Springs, Vinton, Volcano, Wallace, Washington, Weimar, Wendel, West Point, Westwood, Wilseyville, Wilton.

Larger version of district map.