BLS metro-level wage data places Teaching Assistants, Except Postsecondary pay in Napa, CA at a median of $48,450 per year, drawn from the OEWS May 2025 release for this Metropolitan Statistical Area. Compared to the national median of $36,780, Napa pays +32% above, signaling either concentrated employer demand, a cost-of-living premium, or both. Approximately 530 teaching assistants, except postsecondarys are employed across the Napa MSA in SOC 25-9045.

The Napa pay distribution spans from $38,590 at the 10th percentile to $61,190 at the 90th — a 1.6× 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 $45,470 and the 75th at $54,870, so half of Napa-based teaching assistants, except 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 Napa, 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.