The district currently covers the northern coastal areas of San Diego County, including Oceanside, Vista, Carlsbad, Encinitas, Solana Beach and parts of Del Mar as well as a portion of southern Orange County, including San Clemente, Dana Point, San Juan Capistrano, Ladera Ranch, Laguna Niguel and Coto de Caza.

They are partitioned by Gavilan Mountain Rd, Sandia Creek Dr, De Luz Rd, Marine Corps Base Pendleton, Sleeping Indian Rd, Tumbleweed Ln, Del Valle Dr, Highland Oak St, Olive Hill Rd, Via Puerta del Sol, N River Rd, Highway 76, Old River Rd, Little Gopher Canyon Rd, Camino Cantera, Corre Camino, Tierra del Cielo, Elevado Rd, Vista Grande Dr, Warmlands Ave, Queens Way, Canciones del Cielo, Camino Loma Verde, Alessandro Trail, Friendly Dr, Edgehill Rd, Catalina Heights Way, Deeb Ct, Foothill Dr, Clarence Dr, Highway S14, Smilax Rd, Poinsetta Ave, W San Marcos Blvd, Diamond Trail Preserve, S Rancho Santa Rd, San Elijo Rd, Rancho Summitt Dr, Escondido Creek, El Camino del Norte, San Elijo Lagoon, Highland Dr, Avacado Pl, Jimmy Durante Blvd, San Dieguito Dr, 8th St, Nob Ave, Highway S21, and the San Diego Northern Railway.

The 49th district takes in the cities of Carlsbad, Oceanside, Encinitas, Solana Beach, Del Mar, and Vista as well as the census-designated places Camp Pendleton Mainside and Camp Pendleton South.

They are partitioned by Alicia Parkway, Pacific Park Dr, San Joaquin Hills Trans Corridor, Cabot Rd, San Diego Freeway, Via Escolar, Arroyo Trabuco Creek, Oso Parkway, Thomas F Riley Wilderness Park, and Ronald W Casper's Wilderness Park, Aliso & Wood Canyons, Vista del Sol, Highway 1, Stonington Rd, Virginia Way, 7th Ave, and Laguna Beach.

The 49th district takes in the cities of San Clemente, San Juan Capistrano, Dana Point, and Laguna Niguel, as well as the census-designated places Ladera Ranch, Las Flores, and Rancho Mission Viejo.