Population Characteristics - Migration and natural change (2019 - 2020) To resort data: click column headings. To download data: click here. County Name Net Migration (%) Rank Net Migration (%) Net Migration (Number) Natural change (%) Natural change (Number) Adams 1 4.0% 179 0.1% 4 Camas 2 4.0% 45 -0.4% -5 Valley 3 3.0% 350 0.0% 2 Gem 4 3.0% 553 -0.1% -21 Kootenai 5 2.9% 4,890 0.1% 110 Teton 6 2.8% 346 0.5% 61 Payette 7 2.7% 667 0.2% 56 Washington 8 2.5% 254 -0.2% -18 Bonner 9 2.4% 1,133 -0.2% -84 Boundary 10 2.4% 302 0.1% 16 Canyon 11 2.3% 5,477 0.6% 1,324 Owyhee 12 2.3% 278 0.3% 36 Boise 13 2.3% 184 -0.2% -19 Ada 14 2.2% 11,068 0.3% 1,486 Benewah 15 1.7% 161 -0.3% -32 Gooding 16 1.7% 259 0.4% 69 Bonneville 17 1.6% 1,952 0.7% 905 Blaine 18 1.6% 364 0.2% 50 Franklin 19 1.5% 213 0.7% 105 Idaho 20 1.4% 241 -0.2% -40 Clearwater 21 1.4% 121 -0.4% -35 Jefferson 22 1.3% 389 0.9% 276 Butte 23 1.1% 30 -0.2% -4 Twin Falls 24 1.1% 978 0.3% 305 Minidoka 25 1.0% 210 0.5% 97 Shoshone 26 0.7% 92 -0.4% -48 Latah 27 0.7% 290 0.4% 165 Bannock 28 0.7% 612 0.4% 358 Nez Perce 29 0.5% 198 -0.1% -45 Clark 30 0.5% 4 1.2% 10 Bingham 31 0.4% 211 0.5% 217 Fremont 32 0.2% 29 0.6% 83 Lemhi 33 0.2% 17 -0.3% -28 Cassia 34 0.2% 40 0.8% 183 Lincoln 35 0.1% 7 0.5% 26 Oneida 36 0.1% 3 0.4% 18 Lewis 37 0.0% 1 -0.2% -7 Bear Lake 38 0.0% 1 0.2% 11 Custer 39 -0.3% -12 -0.3% -11 Jerome 40 -0.4% -95 0.8% 186 Power 41 -0.5% -36 0.6% 43 Elmore 42 -0.5% -133 0.8% 208 Caribou 43 -0.7% -50 0.4% 25 Madison 44 -2.1% -862 2.4% 981 Source: 2000-2020: U.S. Bureau of the Census, Population Estimates Program, (http://www.census.gov/popest/); DATE LAST UPDATED: May 12, 2021.