• Botanical gardens in the United States by state‎ (51 C)
• National Wildlife Refuges of the United States by state‎ (50 C)
• Wilderness areas of the United States by state‎ (40 C)
• Wildlife management areas of the United States by state‎ (21 C)

A

• Nature reserves in Alabama‎ (4 C, 8 P)
• Nature reserves in Alaska‎ (3 C, 6 P)
• Nature reserves in Arizona‎ (3 C, 7 P)
• Nature reserves in Arkansas‎ (4 C)

C

• Nature reserves in California‎ (5 C, 133 P)
• Nature reserves in Colorado‎ (4 C, 10 P)
• Nature reserves in Connecticut‎ (6 C, 17 P)

D

• Nature reserves in Delaware‎ (2 C)

F

• Nature reserves in Florida‎ (7 C, 50 P)

G

• Nature reserves in Georgia (U.S. state)‎ (3 C, 10 P)

H

• Nature reserves in Hawaii‎ (3 C, 14 P)

I

• Nature reserves in Idaho‎ (3 C)
• Nature reserves in Illinois‎ (4 C, 38 P)
• Nature reserves in Indiana‎ (3 C, 13 P)
• Nature reserves in Iowa‎ (3 C, 3 P)

K

• Nature reserves in Kansas‎ (2 C, 6 P)
• Nature reserves in Kentucky‎ (3 C, 11 P)

L

• Nature reserves in Louisiana‎ (3 C, 5 P)

M

• Nature reserves in Maine‎ (4 C, 3 P)
• Nature reserves in Maryland‎ (3 C, 12 P)
• Nature reserves in Massachusetts‎ (3 C, 4 P)
• Nature reserves in Michigan‎ (3 C, 23 P)
• Nature reserves in Minnesota‎ (3 C, 4 P)
• Nature reserves in Mississippi‎ (4 C, 4 P)
• Nature reserves in Missouri‎ (3 C, 4 P)
• Nature reserves in Montana‎ (5 C, 7 P)

N

• Nature reserves in Nebraska‎ (3 C, 6 P)
• Nature reserves in Nevada‎ (4 C)
• Nature reserves in New Hampshire‎ (3 C, 8 P)
• Nature reserves in New Jersey‎ (3 C, 29 P)
• Nature reserves in New Mexico‎ (3 C, 5 P)
• Nature reserves in New York (state)‎ (5 C, 51 P)
• Nature reserves in North Carolina‎ (3 C, 9 P)
• Nature reserves in North Dakota‎ (3 C)

O

• Nature reserves in Ohio‎ (3 C, 18 P)
• Nature reserves in Oklahoma‎ (3 C, 3 P)
• Nature reserves in Oregon‎ (4 C, 12 P)

P

• Nature reserves in Pennsylvania‎ (4 C, 13 P)

R

• Nature reserves in Rhode Island‎ (2 C, 8 P)

S

• Nature reserves in South Carolina‎ (4 C, 7 P)
• Nature reserves in South Dakota‎ (3 C)

T

• Nature reserves in Tennessee‎ (3 C, 11 P)
• Nature reserves in Texas‎ (4 C, 22 P)

U

• Nature reserves in Utah‎ (3 C)

V

• Nature reserves in Vermont‎ (3 C, 4 P)
• Nature reserves in Virginia‎ (5 C, 5 P)

W

• Nature reserves in Washington (state)‎ (4 C, 10 P)
• Nature reserves in West Virginia‎ (4 C, 5 P)
• Nature reserves in Wisconsin‎ (4 C, 3 P)
• Nature reserves in Wyoming‎ (3 C, 1 P)