It includes the cities of Merced, Madera, Ceres, Patterson, Lathrop, Chowchilla, Atwater, Coalinga, and Mendota; as well as the southern parts of both Modesto and Turlock.

[4] Due to the 2020 redistricting, California's 13th congressional district has been moved geographically to the San Joaquin Valley.

They are partitioned by S Golden State Blvd, Highway J14, Union Pacific, Highway 99, N Golden State Blvd, Faith Home Rd, Rohde Rd, Moore Rd, Tuolumne River, Burlington Northern Santa Fe, Lateral No 2 Park, Viola St, Roble Ave, N Conejo Ave, N Carpenter Rd, Kansas Ave, Morse Rd, and Stanislaus River.

The 5th district takes in the southern halves of the cities of Modesto and Turlock, the cities of Ceres, Patterson, and Newman, and the census-designated places Empire, Airport, Rouse, Bystrom, Parklawn, Bret Harte, Riverdale Park, West Modesto, Keyes, Cowan, Monterey Park Tract, Grayson, Westley, Crows Landing, and Diablo Grande.

The 13th district takes in the cities of Coalinga, Mendota, Kerman, Firebaugh, San Joaquin, and Huron, and the census-designated places Biola, Raisin City, Caruthers, Laton, Riverdale, Lanare, Tranquillity, Three Rocks, Cantua Creek, and Westside.