BLS metro-level wage data places Teaching Assistants, Postsecondary pay in Seattle-Tacoma-Bellevue, WA at a median of $48,380 per year, drawn from the OEWS May 2025 release for this Metropolitan Statistical Area. Compared to the national median of $42,910, Seattle-Tacoma-Bellevue pays +13% above, signaling either concentrated employer demand, a cost-of-living premium, or both. Approximately 510 teaching assistants, postsecondarys are employed across the Seattle-Tacoma-Bellevue MSA in SOC 25-9044.

The Seattle-Tacoma-Bellevue pay distribution spans from $34,650 at the 10th percentile to $61,550 at the 90th — a 1.8× 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 $34,650 and the 75th at $57,550, so half of Seattle-Tacoma-Bellevue-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 Seattle-Tacoma-Bellevue, WA 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 WA data, and peer-metro comparisons — a median is a starting point, not a ceiling.