San Diego property managers indicate that Mission Valley and Fashion Valley occupy the old San Diego River bed that has a land area of 4.3 sq. miles. The 92108 zip code starts on the Hwy as the southern boundary and the northern boundary is ¼ mile north of Friars Rd. along a jagged cut line. The western end of River Walk Golf Course is the most west limit of the zip code, and Fairmount Blvd. is a straight vertical line to the east. Within the perimeter of the zip code there are 21,198 inhabitants which is an even mix of both new and old commercial properties, apartments and residential multi-family housing including condos/townhomes. Get Your Free Instant Rental Property Analysis Report. Contact us today!