BLS metro-level wage data places Library Assistants, Clerical pay in St. Louis, MO-IL at a median of $33,900 per year ($16.30/hr/hour), drawn from the OEWS May 2025 release for this Metropolitan Statistical Area. Compared to the national median of $36,910, St. Louis pays 8% below, which typically tracks with a lower local cost of living or smaller specialized-employer cluster. Approximately 910 library assistants, clericals are employed across the St. Louis MSA in SOC 43-4121.

The St. Louis pay distribution spans from $30,050 at the 10th percentile to $40,240 at the 90th — a 1.3× spread that reflects experience tenure, specialization, employer size, and the difference between public-sector, nonprofit, and private-sector compensation inside the metro. The 25th percentile sits at $31,200 and the 75th at $37,120, so half of St. Louis-based library assistants, clericals earn within that middle band.

Metro figures capture where you actually work, not just where you live — which matters for commuters. BLS draws metro boundaries from the OMB MSA definitions, so St. Louis, MO-IL covers the central city plus outlying counties tied to the metro economically. Remember that OEWS wages reflect base pay only: employer-provided health insurance, retirement matches, stock options, signing bonuses, overtime, and tips are excluded and can add 20-40% to real total compensation. Before using this metro median as a negotiation anchor, triangulate against the same occupation's national profile (linked below), its state-wide MO data, and peer-metro comparisons — a median is a starting point, not a ceiling.