2000 U.S. population density in persons per sq. mile (contiguous U.S. only). Averaged on a per-county basis.

Legend, light to dark (white to dark blue):

• 0-1 (mint green)
• 1-4 (pink)
• 5-9 (blue-green)
• 10-24 (orange)
• 25-49 (teal)
• 50-99 (lime green)
• 100-249 (violet)
• 250-66,995 (dark blue)