U.S. Forest Service
The Forest Service manages the national forests and grasslands and the wilderness areas inside them, the largest share of the wilderness system by count. 560 units on this site, 274 million acres together. Largest first.
Wilderness areas
- 2.4 million acres
- 2.1 million acres
- 1.3 million acresSelway-Bitterroot WildernessID and MT
- 1.1 million acres
- 989,922 acres
- 937,102 acresAbsaroka-Beartooth WildernessMT and WY
- 816,244 acres
- 693,934 acres
- 652,903 acres
- 648,883 acres
- 584,733 acres
- 566,161 acres
- 559,310 acres
- 537,357 acres
- 531,325 acres
- 497,111 acres
- 453,863 acres
- 436,084 acres
- 426,751 acres
- 414,322 acres
- 355,553 acres
- 348,626 acres
- 346,320 acres
- 315,820 acres
- 303,713 acres
- 286,659 acres
- 285,619 acres
- 283,818 acres
- 271,348 acres
- 259,756 acres
Show all 448Hide
- 250,760 acres
- 242,068 acres
- 236,726 acres
- 231,619 acres
- 230,966 acres
- 230,829 acres
- 225,114 acres
- 221,796 acres
- 219,891 acres
- 219,209 acres
- 217,747 acresHells Canyon WildernessID and OR
- 217,511 acres
- 205,395 acres
- 203,548 acres
- 199,208 acres
- 198,906 acres
- 191,914 acres
- 191,104 acres
- 182,298 acres
- 181,973 acres
- 180,103 acres
- 179,847 acres
- 176,737 acresWenaha-Tucannon WildernessOR and WA
- 176,431 acres
- 168,955 acres
- 165,874 acres
- 160,997 acres
- 160,309 acres
- 160,164 acres
- 158,712 acres
- 158,147 acres
- 152,980 acres
- 135,104 acres
- 133,720 acres
- 128,044 acres
- 126,480 acres
- 123,896 acres
- 122,453 acres
- 121,449 acres
- 120,694 acres
- 120,551 acres
- 119,966 acres
- 116,843 acres
- 114,864 acres
- 113,571 acres
- 112,723 acres
- 110,471 acres
- 109,098 acres
- 108,020 acres
- 105,543 acres
- 104,048 acres
- 102,919 acres
- 102,620 acres
- 102,209 acres
- 101,574 acres
- 98,396 acres
- 93,272 acres
- 92,652 acres
- 92,627 acres
- 90,776 acres
- 88,650 acres
- 87,182 acres
- 86,771 acres
- 86,245 acres
- 82,593 acres
- 82,496 acres
- 78,576 acres
- 77,932 acres
- 77,585 acres
- 75,031 acres
- 74,524 acres
- 74,408 acres
- 73,416 acres
- 71,275 acres
- 70,206 acres
- 69,411 acres
- 68,231 acres
- 68,025 acres
- 67,993 acres
- 66,994 acres
- 65,435 acres
- 64,742 acres
- 64,307 acres
- 64,041 acres
- 62,742 acres
- 62,139 acres
- 60,773 acres
- 60,280 acres
- 60,222 acres
- 60,183 acres
- 58,448 acres
- 56,973 acres
- 56,819 acres
- 56,239 acres
- 55,127 acres
- 54,406 acres
- 52,496 acres
- 52,451 acres
- 52,294 acres
- 50,216 acres
- 49,344 acres
- 49,151 acres
- 48,314 acres
- 47,742 acres
- 47,311 acres
- 47,123 acres
- 47,035 acres
- 46,963 acres
- 46,943 acres
- 46,756 acres
- 46,360 acres
- 45,809 acres
- 44,678 acres
- 44,572 acres
- 44,372 acres
- 44,345 acres
- 44,270 acres
- 44,223 acres
- 43,182 acres
- 42,079 acres
- 41,531 acres
- 41,307 acres
- 41,305 acres
- 41,281 acres
- 41,143 acres
- 40,041 acres
- 39,917 acres
- 39,412 acres
- 38,599 acres
- 37,793 acres
- 37,457 acres
- 37,344 acres
- 37,278 acres
- 37,033 acresCohutta WildernessGA and TN
- 36,981 acres
- 36,949 acres
- 36,879 acres
- 36,865 acres
- 36,764 acres
- 36,548 acres
- 36,151 acres
- 35,749 acres
- 35,738 acres
- 35,581 acres
- 35,301 acres
- 35,203 acres
- 35,091 acres
- 34,304 acres
- 32,364 acres
- 32,186 acres
- 32,115 acres
- 32,072 acres
- 32,062 acres
- 31,415 acres
- 31,223 acres
- 31,057 acres
- 30,863 acres
- 30,787 acres
- 30,632 acres
- 29,207 acres
- 29,106 acres
- 29,027 acres
- 28,915 acres
- 28,460 acres
- 28,374 acres
- 28,248 acres
- 27,605 acres
- 27,075 acres
- 26,912 acres
- 26,839 acres
- 26,310 acres
- 25,809 acres
- 25,635 acres
- 25,457 acres
- 25,141 acres
- 25,078 acres
- 24,985 acres
- 24,783 acres
- 24,222 acres
- 24,051 acresPlatte River WildernessCO and WY
- 24,032 acres
- 23,578 acres
- 23,364 acresSouthern Nantahala WildernessGA and NC
- 23,116 acres
- 23,083 acres
- 23,036 acres
- 22,843 acres
- 22,614 acres
- 22,374 acres
- 22,330 acres
- 22,047 acres
- 21,986 acres
- 20,847 acres
- 20,839 acres
- 20,784 acres
- 20,777 acres
- 20,705 acres
- 20,521 acres
- 20,420 acres
- 20,253 acres
- 20,251 acres
- 20,241 acres
- 20,213 acres
- 20,210 acres
- 20,158 acres
- 20,130 acresRed Buttes WildernessCA and OR
- 20,053 acres
- 19,918 acres
- 19,246 acresJoyce Kilmer-Slickrock WildernessNC and TN
- 19,237 acres
- 19,154 acres
- 19,118 acres
- 18,881 acres
- 18,827 acres
- 18,720 acres
- 18,534 acres
- 18,477 acres
- 18,278 acres
- 18,122 acres
- 18,109 acres
- 18,002 acres
- 17,777 acres
- 17,176 acres
- 17,173 acres
- 17,109 acres
- 16,861 acres
- 16,704 acres
- 16,652 acres
- 16,618 acres
- 16,526 acres
- 16,525 acresMountain Lake WildernessVA and WV
- 16,486 acres
- 16,427 acres
- 16,297 acres
- 16,213 acres
- 16,009 acres
- 15,776 acres
- 15,465 acres
- 15,291 acres
- 15,284 acres
- 15,237 acres
- 15,214 acres
- 14,698 acres
- 14,616 acres
- 14,293 acres
- 14,266 acres
- 14,262 acres
- 13,987 acres
- 13,835 acres
- 13,724 acres
- 13,534 acres
- 13,347 acresBlack Fork Mountain WildernessAR and OK
- 13,278 acres
- 13,260 acres
- 13,248 acres
- 13,090 acres
- 13,007 acres
- 13,000 acres
- 12,853 acres
- 12,615 acres
- 12,521 acres
- 12,472 acres
- 12,423 acres
- 12,371 acres
- 12,336 acres
- 12,214 acres
- 12,178 acres
- 11,978 acres
- 11,951 acres
- 11,851 acres
- 11,801 acres
- 11,674 acres
- 11,653 acres
- 11,559 acres
- 11,436 acres
- 11,358 acres
- 11,236 acres
- 11,235 acres
- 11,141 acres
- 10,999 acres
- 10,895 acres
- 10,804 acres
- 10,791 acres
- 10,666 acres
- 10,662 acres
- 10,585 acres
- 10,518 acres
- 10,510 acres
- 10,467 acres
- 10,431 acres
- 10,414 acres
- 10,412 acres
- 10,372 acres
- 10,343 acres
- 10,208 acres
- 10,180 acres
- 9,927 acres
- 9,826 acres
- 9,808 acres
- 9,482 acres
- 9,465 acres
- 9,327 acres
- 9,315 acres
- 9,240 acres
- 9,183 acres
- 9,037 acres
- 9,026 acres
- 8,947 acres
- 8,907 acres
- 8,801 acres
- 8,758 acres
- 8,701 acres
- 8,633 acres
- 8,502 acresBig Frog WildernessGA and TN
- 8,490 acres
- 8,471 acres
- 8,300 acresEllicott Rock WildernessGA, NC and SC
- 8,184 acres
- 8,158 acres
- 8,075 acres
- 8,022 acres
- 7,833 acres
- 7,824 acres
- 7,742 acres
- 7,566 acres
- 7,499 acres
- 7,482 acres
- 7,400 acres
- 7,327 acres
- 7,273 acres
- 7,272 acres
- 7,270 acres
- 7,179 acres
- 7,135 acres
- 7,085 acres
- 7,040 acres
- 6,937 acres
- 6,919 acres
- 6,819 acres
- 6,794 acres
- 6,725 acres
- 6,691 acres
- 6,664 acres
- 6,577 acres
- 6,532 acres
- 6,352 acres
- 6,301 acres
- 6,178 acres
- 6,154 acres
- 6,071 acres
- 6,048 acres
- 6,037 acres
- 5,994 acres
- 5,963 acres
- 5,912 acres
- 5,887 acres
- 5,840 acres
- 5,800 acres
- 5,792 acres
- 5,773 acres
- 5,658 acres
- 5,634 acres
- 5,633 acres
- 5,613 acres
- 5,575 acres
- 5,536 acres
- 5,507 acres
- 5,461 acres
- 5,337 acres
- 5,268 acres
- 5,185 acres
- 5,158 acres
- 5,147 acres
- 5,065 acres
- 5,033 acres
- 4,967 acres
- 4,965 acres
- 4,816 acres
- 4,814 acres
- 4,800 acres
- 4,795 acres
- 4,755 acres
- 4,739 acres
- 4,724 acres
- 4,607 acres
- 4,520 acres
- 4,472 acres
- 4,236 acres
- 4,225 acres
- 4,074 acres
- 3,955 acres
- 3,879 acres
- 3,817 acres
- 3,791 acres
- 3,750 acres
- 3,745 acres
- 3,694 acres
- 3,521 acres
- 3,329 acres
- 3,273 acres
- 3,271 acres
- 3,064 acres
- 3,060 acres
- 2,871 acres
- 2,845 acres
- 2,827 acres
- 2,760 acres
- 2,648 acres
- 2,559 acres
- 2,427 acres
- 2,201 acres
- 2,122 acres
- 1,832 acres
- 1,692 acres
- 993 acres
- 821 acres
- 375 acres
- 372 acres
National forests and grasslands
- 18 million acres
- 6.7 million acresHumboldt-Toiyabe National ForestNV and CA
- 6.2 million acres
- 4.6 million acresMedicine Bow-Routt National ForestWY and CO
- 4.4 million acres
- 4.1 million acres
- 4.0 million acresPike and San Isabel National ForestsCO and KS
- 3.9 million acres
- 3.9 million acres
- 3.6 million acres
- 3.5 million acresGeorge Washington and Jefferson National ForestVA, WV and KY
- 3.5 million acres
- 3.4 million acresCuster Gallatin National ForestMT and SD
- 3.4 million acres
- 3.2 million acresCibola National ForestNM, TX and OK
- 3.2 million acres
- 3.2 million acres
- 3.1 million acresCaribou-Targhee National ForestID and WY
- 3.1 million acres
- 3.0 million acres
- 3.0 million acres
- 2.9 million acresIdaho Panhandle National ForestsID, WA and MT
- 2.9 million acresUinta-Wasatch-Cache National ForestUT and WY
- 2.8 million acres
- 2.7 million acresOuachita National ForestAR and OK
- 2.7 million acres
- 2.7 million acres
- 2.6 million acres
- 2.6 million acresKootenai National ForestMT and ID
- 2.5 million acres
Show all 112Hide
- 2.5 million acresWallowa-Whitman National ForestOR and ID
- 2.5 million acres
- 2.5 million acres
- 2.5 million acres
- 2.4 million acres
- 2.4 million acres
- 2.2 million acresSawtooth National ForestID and UT
- 2.1 million acres
- 2.1 million acresInyo National ForestCA and NV
- 2.1 million acres
- 2.1 million acresNebraska National ForestSD and NE
- 2.0 million acres
- 2.0 million acres
- 2.0 million acres
- 2.0 million acres
- 2.0 million acres
- 2.0 million acres
- 2.0 million acres
- 1.9 million acres
- 1.9 million acres
- 1.9 million acres
- 1.9 million acres
- 1.8 million acres
- 1.8 million acres
- 1.8 million acres
- 1.8 million acres
- 1.8 million acresCoronado National ForestAZ and NM
- 1.8 million acres
- 1.7 million acres
- 1.7 million acresKlamath National ForestCA and OR
- 1.7 million acres
- 1.7 million acres
- 1.7 million acresBitterroot National ForestMT and ID
- 1.6 million acres
- 1.6 million acres
- 1.6 million acres
- 1.6 million acres
- 1.5 million acresBlack Hills National ForestSD and WY
- 1.5 million acres
- 1.5 million acresUmatilla National ForestOR and WA
- 1.5 million acres
- 1.5 million acres
- 1.4 million acres
- 1.4 million acres
- 1.4 million acres
- 1.4 million acresManti-La Sal National ForestUT and CO
- 1.4 million acres
- 1.4 million acresAshley National ForestUT and WY
- 1.4 million acresDakota Prairie GrasslandsND and SD
- 1.4 million acres
- 1.3 million acres
- 1.3 million acres
- 1.3 million acres
- 1.3 million acres
- 1.2 million acres
- 1.2 million acres
- 1.2 million acres
- 1.1 million acres
- 1.1 million acres
- 1.1 million acres
- 1.1 million acres
- 1.1 million acres
- 1.0 million acres
- 946,821 acresWhite Mountain National ForestNH and ME
- 930,027 acres
- 912,775 acres
- 856,184 acres
- 854,081 acres
- 835,600 acres
- 805,483 acres
- 793,653 acres
- 740,869 acres
- 706,719 acres
- 697,411 acres
- 646,949 acres
- 561,887 acres
- 331,807 acresLake Tahoe Basin Management UnitCA and NV
- 292,682 acres
- 198,068 acresSavannah River SiteSC and GA
- 171,281 acres
- 55,812 acres
- 27,566 acres
A unit is listed under every agency the boundary layer names as managing it. Data refreshed September 18, 2026.