The 31st and the 28th are partitioned by Rio Hondo River, Garvey Ave, Highway 19, Highway 10, Eaton Wash, Temple City Blvd, Valley Blvd, Ellis Ln, Lower Azusa Rd, Grande Ave, Santa Anita Ave, Lynrose St, Flood Control Basin, Peck Rd, Randolph St, Cogswell Rd, Clark St, Durfree Ave, Santa Anita Wash, S 10th Ave, Jeffries Ave, Mayflower/Fairgreen Ave, Alta Vista/Fairgreen Ave, El Norte Ave, S 5th Ave, Valencia Way/N 5th Ave, Hillcrest Blvd, E Hillcrest Blvd, Grand Ave, E Greystone Ave, N Bradoaks Ave, Angeles National Forest, W Fork Rd, Highway 39, Cedar Creek, Iron Fork, Glendora Mountain Rd, Morris Reservoir, W Sierra Madre Ave, N Lorraine Ave, E Foothill Blvd, E Carroll Ave, Steffen St, S Lorraine Ave, AT and SF Railway, E Route 66, N Cataract Ave, San Dimas Canyon Rd, Clayton Ct, Live Oak Canyon, Rotary Dr, Highway 30, Williams Ave, Highway 210, Garey Ave, and Summer Ave.
The 31st and the 28th are separated by Rio Hondo River, Garvey Avenue, Highway 19, Highway 10, Eaton Wash, Temple City Boulevard, Valley Boulevard, Ellis Lane, Lower Azusa Road, Grande Avenue, Santa Anita Avenue, Lynrose Street, Flood Control Basin, Peck Road, Randolph Street, Cogswell Road, Clark Street, Durfree Avenue, Santa Anita Wash, S 10th Avenue, Jeffries Avenue, Mayflower/Fairgreen Avenue, Alta Vista/Fairgreen Avenue, El Norte Avenue, S 5th Avenue, Valencia Way/N 5th Avenue, Hillcrest Boulevard, E Hillcrest Boulevard, Grand Avenue, E Greystone Avenue, N Bradoaks Avenue, Angeles National Forest, W Fork Road, Highway 39, Cedar Creek, Iron Fork, Glendora Mountain Road, Morris Reservoir, W Sierra Madre Avenue, N Lorraine Avenue, E Foothill Boulevard, E Carroll Avenue, Steffen Street, S Lorraine Avenue, AT and SF Railway, E Route 66, N Cataract Avenue, San Dimas Canyon Road, Clayton Court, Live Oak Canyon, Rotary Drive, Highway 30, Williams Avenue, Highway 210, Garey Avenue, and Summer Avenue.