Job seekers fill out applications while waiting in line for a hiring event at a new Target Corp. store in San Francisco, California.

Unemployment rates rose in more than half of U.S. states in July and fewer states added jobs, echoing national data that show the job market may have lost some momentum.

The Labor Department said Monday that unemployment rates increased in 28 states. They were unchanged in 14 and fell in eight states—the fewest to show a decline since January.