For every 1,000 jobs in the Chicago metro, BLS counts 2.395 HR managers. Nationally the share is much lower, which is what the 1.69 location quotient measures. A likely explanation is the metro's mix of head offices and regional offices, which tend to keep HR leadership, policy and total rewards work in one place.
The support layer is closer to average. HR specialists, at 26,470 jobs, match the national share. Training and development specialists are scarcer than in the U.S. and earn less ($67,050 versus $69,280), which may mean more learning work is handled by generalists or bought from outside firms. For employers, that means a director-level search here has a wide field, while a hands-on trainer or instructional designer search may not.
Pay runs moderately above the U.S. across most of the function. The median HR manager earned $156,770, about 5% over the national $149,280. Payroll and timekeeping clerks earned $62,920, about 8% above the U.S., even though the pool (0.94) is slightly thinner than average.