Demonstrations are aimed at pushing Walmart to pay workers at least $25,000 per year and not to retaliate striking workers.
Among the protest sites, the Arizona community where Walmart board chairman Rob Walton lives.
One protester said, "when we speak up against the wages, when we speak up against the hours. when we speak up against them firing us for no reason, we get retaliated against."
Walmart is maintaining its stance in the wage fight. A hearing began Monday in California in a case involving 60 Walmart workers, 19 of whom were fired. The retailer says it was within its rights under the law. If the company loses the case, it could be forced to rehire the workers and provide them with back pay.