Birthdays in San Dimas split cleanly between the hills and the flats, and the two want different deliveries. Above the Bonita Avenue spine the land climbs into the Via Verde tracts by the country club, up the Marchant streets, along the frontages under the Puente Hills and out toward San Dimas Canyon — deep driveways, side gates, and the kind of house where a bouquet left at the front door at 1:15 is genuinely safe until someone gets home. South and west, along Arrow Highway, Gladstone Street, Lone Hill Avenue and Cataract Avenue, the pattern turns to postwar tract blocks, apartment courts and condominium clusters, where the practical question is whether the driver can get past a gate or a locked lobby. The city runs almost entirely on one ZIP, 91773; the marketplace ring also carries 91750 in La Verne, 91741 in Glendora, and 91724 across the Covina and Charter Oak edge, which is where a good share of San Dimas birthday orders are actually addressed once family is counted in.
The workday half of the volume is easier here than the residential half, because San Dimas keeps its employment close to its freeways. The commercial and light-industrial belt along Arrow Highway and Gladstone Street holds most of the front desks, and the rest of the desk drops cluster around a handful of institutions with real addresses: the Forest Service's San Dimas Technology and Development Center on East Bonita Avenue, the Bonita Unified School District offices and the district's own campuses including San Dimas High School, the Los Angeles County Sheriff's San Dimas Station, and the city civic offices on Bonita. Beyond the line, the ring covers the employment that San Dimas residents commute to rather than from — Cal Poly Pomona off Temple Avenue, the University of La Verne two miles east, Citrus College in Glendora, Mt. San Antonio College over in Walnut, the Fairplex campus in Pomona, and the warehouse and back-office belt that runs east along the 10 toward Ontario. A workplace drop only needs three things from you: the building, the recipient's full name, and the department or floor. Reception will do the rest.