Marriott is far from extracting itself from labor troubles as the number of its workers still on strike is much larger than the number of those who recently agreed to new labor contracts, according to their union.

About 7,700 Marriott International Inc. employees went on strike at the beginning of October, UNITE HERE spokeswoman Rachel Gumpert told Bloomberg Law Nov. 21. Though the union has reached labor contracts for roughly 2,500 workers in Boston, Detroit, and California cities Oakland, San...