BLS metro-level wage data places Teaching Assistants, Postsecondary pay in Riverside-San Bernardino-Ontario, CA at a median of $38,640 per year, drawn from the OEWS May 2025 release for this Metropolitan Statistical Area. Compared to the national median of $42,910, Riverside-San Bernardino-Ontario pays 10% below, which typically tracks with a lower local cost of living or smaller specialized-employer cluster. Approximately 540 teaching assistants, postsecondarys are employed across the Riverside-San Bernardino-Ontario MSA in SOC 25-9044.

The Riverside-San Bernardino-Ontario pay distribution spans from $34,750 at the 10th percentile to $68,560 at the 90th — a 2.0× 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 $36,450 and the 75th at $58,930, so half of Riverside-San Bernardino-Ontario-based teaching assistants, postsecondarys 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 Riverside-San Bernardino-Ontario, CA 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 CA data, and peer-metro comparisons — a median is a starting point, not a ceiling.