If you live in these cities, you may be in Silicon Valley: Atherton, Belmont, Burlingame, Campbell, Cupertino, East Palo Alto, Emeryville, Foster City, Fremont, Gilroy, Hayward, Los Altos, Los Altos Hills, Los Gatos, Menlo Park, Millbrae, Milpitas, Monte Sereno, Morgan Hill, Mountain View, Newark, Palo Alto, Redwood City, San Bruno, San Carlos, San Francisco, San Jose, San Leandro, San Mateo, Santa Clara, Saratoga, South San Francisco and Sunnyvale
Companies located in Silicon Valley include but aren't limited to these: Adobe Systems, Advanced Micro Devices, Agilent Technologies, Align Technology, Apple Inc., Applied Materials, Cisco Systems, eBay, Google, Hewlett-Packard, Intel, Intuit, Juniper Networks, KLA Tencor, LSI Logic, Marvell Semiconductors, Maxim Integrated Products, National Semiconductor, NetApp, Nvidia, Oracle Corporation, Salesforce.com, SanDisk, Symantec, Western Digital, Yahoo!, Adaptec, Aeria Games and Entertainment, Akamai Technologies, Altera, Amazon.com's A9.com, Amazon.com's Lab126.com, Amdahl, Ampex, Facebook, Fairchild Semiconductor, Force10, Foundry Networks, Hitachi Data Systems, Hitachi Global Storage Technologies, IBM Almaden Research Center, Kerio Technologies, LinkedIn, Logitech, LynuxWorks, Maxtor (acquired by Seagate), McAfee (acquired by Intel), Mozilla Foundation, Move Inc, Netflix, Netscape (acquired by AOL), NeXT Computer, Inc. (acquired by Apple), Ning, NXP Semiconductors, PayPal (now part of eBay), Playdom, PlayPhone, Quanta Computer, Quantcast, Quora, Rambus, Riverbed Technology, Salesforce.com, Silicon Graphics, Silicon Image, Sony Ericsson, SRI International, Sun Microsystems, SunPower, Synopsys Inc., Tibco Software, Tesla Motors, TWiT, TiVo, Twitter, VA Software (Slashdot), WebEx, VeriSign, Veritas Software, VMware, Vocera, Xilinx, YouTube, Yelp, Inc., Zoran Corporation, and Fry's Electronics.