| District 4 | ||||||||
| Where | Start/End | Direction | D | Lat N | Long W | Cxn | D | D |
| San Gabriels | Line ESE | 93 | 34.13.00 | 117.58.30 | ||||
| Glendora | Glendora Mountain Road | Glendora Mtn E | 93 | 34.11.57 | 117.50.30 | |||
| Glendora | Glendora Ridge Road | Line SSW | 30 | Glendora Ridge E | 93 | 30 | ||
| Glendora | Foothill/Amelia | Amelia S (+ ext) | 30 | |||||
| Glendora | 57 Fwy | 57 S | 30 | |||||
| Brea | Orange County Line | County Line W | 9 | County Line E | 9 | 30 | ||
| La Habra | Harbor Blvd | County Line W | 18 | Harbor S | 9 | 18 | ||
| La Habra | Hacienda Road/Blvd | Hacienda N | 18 | |||||
| Hacienda Heights | Pomona Fwy 60 | 60 W | 18 | |||||
| Clayton | 605 Fwy | 605 N | 13 | 605 S | 14 | 18 | ||
| Irwindale | Arrow Hwy | Arrow W | 13 | 60 W | 13 | 14 | ||
| Irwindale | Buena Vista Street | Buena Vista N | 13 | |||||
| Duarte | Line N | 13 | 34.08.36 | 117.58.39 | ||||
| San Gabriels | 34.13.00 | 117.58.30 | ||||||
| Monrovia, Duarte, Bradbury, Irwindale, Azusa, Glendora, Covina, West Covina, Baldwin Park | ||||||||
| La Puente, Industry, Hacienda Heights, La Habra Heights, Rowland Heights, Walnut, Pomona | ||||||||