I'd like to know the exact location (City/town) of all foreign factories owned and operated by WalMart? Where could I find this information?
Ok, if not owned and operated, then locations overseas where WalMart pays (operates) people to make goods which WalMart will sell (owns). Thanks for help so far.
I'd like to make a digital map of these places.

Depends on what you mean by "owned and operated." Walmart, like all major corporation, has ownership of many smaller sub corps that branch out like a spiderweb. Ownership of a certain factory may be held in the name of a sub corp even though walmart actually owns it if you trace the path back far enough.

Trying to determine things like this is what keeps Forensic Accountants in business.

I would start by looking at Walmarts investor relations page (linked below) and going through their SEC filings and financial reports. You might also consider buying a share of stock (thereby becoming a shareholder) and calling their "shareholder services" department.

http://walmartstores.com/Investors/