The strike will affect 77 stores in Adams, Arapahoe, Broomfield, Denver, Douglas and Jefferson counties, as well as in Boulder and Louisville.

Union members took to the picket lines Thursday against King Soopers stores across the Denver area and in Boulder and Louisville. Here’s a list of the impacted stores.

Some 10,000 grocery store workers across the greater Denver area went on strike Thursday, claiming unfair and illegal negotiating practices by King Soopers while their union has been negotiating a new contract with the store chain.