Agriculture - Land in farms (2017) To resort data: click column headings. To download data: click here. County Name Acreage in farms Rank Acreage in farms Average size of farms (acres) Median size of farms (acres) Bingham 1 932,944 793 25 Owyhee 2 727,338 1,287 73 Cassia 3 643,346 1,100 100 Idaho 4 537,428 759 134 Power 5 486,377 1,649 554 Twin Falls 6 468,809 387 40 Washington 7 468,433 876 53 Bonneville 8 418,881 378 13 Nez Perce 9 381,587 856 80 Caribou 10 366,499 892 305 Elmore 11 358,454 1,054 20 Latah 12 349,532 336 51 Jefferson 13 333,522 445 32 Oneida 14 319,789 758 170 Bannock 15 315,038 416 40 Bear Lake 16 296,959 752 160 Fremont 17 279,578 545 95 Canyon 18 274,952 120 10 Minidoka 19 267,567 432 41 Franklin 20 228,382 290 69 Blaine 21 211,228 1,112 80 Lewis 22 200,435 1,017 206 Madison 23 196,046 432 44 Camas 24 192,672 1,276 280 Gooding 25 188,353 350 36 Gem 26 183,177 213 10 Lemhi 27 173,956 496 55 Jerome 28 171,643 353 51 Adams 29 163,054 703 93 Payette 30 162,622 254 20 Clark 31 149,411 2,197 600 Custer 32 147,837 554 126 Benewah 33 139,944 486 64 Kootenai 34 139,705 130 20 Lincoln 35 134,911 489 160 Butte 36 130,366 690 235 Teton 37 117,404 424 101 Ada 38 112,370 86 9 Bonner 39 89,331 74 20 Boundary 40 68,884 198 50 Clearwater 41 56,556 181 47 Boise 42 53,198 591 15 Valley 43 50,959 271 39 Shoshone 44 2,435 51 20 Source: 2002-2017: USDA, National Agricultural Statistics Service - 2002, 2007, 2012, 2017 Census of Agriculture (https://www.agcensus.usda.gov/); DATE LAST UPDATED: April 15, 2019.