1,029,588 boys play 11-player football across 14,269 schools — the single most-participated boys sport nationally by raw count. A separate, fast-growing category, girls flag football, reached 68,847 participants across 2,736 schools this year, up 60% year over year.
Football is often assumed to be the biggest draw in high school sports. The one national attendance dataset available — an NFHS survey from the 2009–10 season — actually shows basketball narrowly ahead in cumulative season attendance, almost certainly because basketball plays far more games per year. Football's real, defensible claim isn't attendance — it's scale: more participating athletes, on more teams, than any other single boys' sport in the country.
No rule permits a sponsor's logo on a player's jersey. NFHS uniform rules cap manufacturer marks at 2¼ square inches — a figure corroborated secondhand and by the identically-worded rule in baseball, though the primary football rule document itself wasn't directly accessible to quote verbatim. Real sponsorship inventory lives in venue signage, printed programs, and PA or scoreboard recognition, governed by local district policy rather than any football-specific rule.
Booster clubs that would rather not run sponsor outreach on top of game-day logistics can consider Zubie Five as one option.