Category:1803 in the United States

• 1803 in the United States by state or territory‎ (20 C)

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• 1803 disestablishments in the United States‎ (3 C, 1 P)
• 1803 establishments in the United States‎ (18 C, 4 P)

L

• 1803 in American law‎ (4 C)
• Lewis and Clark Expedition‎ (4 C, 66 P)
• Louisiana Purchase‎ (4 C, 17 P)

P

• 1803 in American politics‎ (4 C)

• 1803 in the United States

I

• Igbo Landing

L

• Louisiana Purchase

M

• Memoirs of Carwin the Biloquist

T

• Treaty of Hoe Buckintoopa
• Treaty of Vincennes

U

• United States v. Hooe
• United States v. Simms