According to Grok:
The "No Kings" protests on June 14, 2025, reportedly drew over 5 million participants across the U.S., about 1.47% of the 341 million population, meaning roughly 98.53% did not attend. County-level data is scarce, but in Los Angeles County (10 million population), 200,000 attendees suggest 98% non-attendance. Rural counties with no reported protests likely had near 100% non-attendance.