Live Chat I-15 Community Nearby Traffic San Marcos Post Office (Amenity postoffice) 2024-05-15 Roadnow Weather | Gas | Restaurants | Hotels | Car Repair | Convenience Stores Cities close to San Marcos Post Office (Amenity Postoffice) Escondido, CA 6.91 Vista, CA 7.85 Carlsbad, CA 8.36 Interstate highway exits close to San Marcos Post Office (Amenity Postoffice) Exit 33, i15 6.23 Exit 34, i15 6.43 Exit 32, i15 6.48 Interstate highways close to San Marcos Post Office (Amenity Postoffice) i15 map 6.23 i5 map 13.61 i805ca map 27.19 State roads close to San Marcos Post Office (Amenity Postoffice) CA CR S14 map 0.06 CA CR S12 map 0.60 CA 78 map 0.90