BLS metro-level wage data places Biological Science Teachers, Postsecondary pay in South Illinois nonmetropolitan area at a median of $105,290 per year, drawn from the OEWS May 2025 release for this Metropolitan Statistical Area. Compared to the national median of $84,620, South Illinois nonmetropolitan area pays +24% above, signaling either concentrated employer demand, a cost-of-living premium, or both. Approximately 70 biological science teachers, postsecondarys are employed across the South Illinois nonmetropolitan area MSA in SOC 25-1042.

The South Illinois nonmetropolitan area pay distribution spans from $59,890 at the 10th percentile to $140,980 at the 90th — a 2.4× 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 $72,290 and the 75th at $105,290, so half of South Illinois nonmetropolitan area-based biological science teachers, 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 South Illinois nonmetropolitan area 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 IL data, and peer-metro comparisons — a median is a starting point, not a ceiling.