| School District No. 1 in the County of Denver and State of C | Denver | PK–12 | 90,471 |
| Jefferson County School District No. R-1 | Golden | PK–12 | 73,532 |
| Douglas County School District No. Re 1 | Castle Rock | PK–12 | 61,243 |
| Cherry Creek School District No. 5 in the County of Arapah | Greenwood Village | PK–12 | 51,980 |
| Aurora Joint District No. 28 of the Counties of Adams and A | Aurora | PK–12 | 38,702 |
| Adams 12 Five Star Schools | Thornton | PK–12 | 34,466 |
| St. Vrain Valley School District No. Re1j | Longmont | PK–12 | 31,607 |
| Poudre School District R-1 | Fort Collins | PK–12 | 29,381 |
| Boulder Valley School District No. Re2 | Boulder | PK–12 | 27,988 |
| El Paso County Colorado School District 49 | Peyton | PK–12 | 25,689 |
| Academy School District No. 20 in the County of El Paso An | Colorado Springs | PK–12 | 25,607 |
| School District 27j | Brighton | PK–12 | 24,046 |
| Greeleyschool District No. 6 in the County of Weld and Sta | Greeley | PK–12 | 22,917 |
| Colorado Springs School District No. 11 in the County of E | Colorado Springs | PK–12 | 22,227 |
| State Charter School Institute | Denver | PK–12 | 19,960 |
| Mesa County Valley School District No. 51 | Grand Junction | PK–12 | 19,753 |
| Thompson School District R-2j | Loveland | PK–12 | 14,580 |
| Pueblo School District No. 60 in the County of Pueblo and | Pueblo | PK–12 | 14,104 |
| Littleton School District No. 6 in the County of Arapahoe | Littleton | PK–12 | 13,109 |
| Harrison School District No. 2 in the County of El Paso An | Colorado Springs | PK–12 | 11,938 |
| Pueblo County School District 70 | Pueblo | PK–12 | 10,386 |
| School District No. 3 in the County of El Paso and State of | Colorado Springs | PK–12 | 9,290 |
| Weld County Reorganized School District No. Re-4 | Windsor | PK–12 | 8,728 |
| Fountain School District No. 8 in the County of El Paso An | Fountain | PK–12 | 7,955 |
| Westminster Public Schools | Westminster | PK–12 | 7,724 |
| Mapleton School District No. 1 in the County of Adams & St | Denver | PK–12 | 7,095 |
| Byers School District No. 32j | Byers | PK–12 | 6,853 |
| Lewis-Palmer Consolidated School District No. 38 in the Co | Monument | PK–12 | 6,332 |
| Eagle County School District No. Re 50 | Eagle | PK–12 | 6,309 |
| Montrose County School District Re-1j | Montrose | PK–12 | 5,977 |
| Roaring Fork School District No. Re-1 | Carbondale | PK–12 | 5,839 |
| School District N. 14 in the County of Adams & State of Colo | Commerce City | PK–12 | 5,221 |
| Education Reenvisioned Boces | Monument | K–12 | 5,083 |
| Garfield School District No. Re-2 | Rifle | PK–12 | 4,695 |
| Delta County Joint District No. 50 | Delta | PK–12 | 4,396 |
| Durango School District No. 9-R | Durango | PK–12 | 4,337 |
| Weld County School District No. Re-5j | Milliken | PK–12 | 4,055 |
| Cheyenne Mountain School District No. 12 in the County of E | Colorado Springs | PK–12 | 3,745 |
| Summit School District No. Re 1 | Frisco | PK–12 | 3,473 |
| School District No. Re-3 Fort Morgan | Fort Morgan | PK–12 | 3,451 |
| Fremont Re-1 | Canon City | PK–12 | 3,191 |
| Weld County School District Re-3j | Hudson | PK–12 | 2,666 |
| Steamboat Springs School District No. Re 2 | Steamboat Springs | PK–12 | 2,509 |
| Weld Re-8 Schools | Fort Lupton | PK–12 | 2,503 |
| Englewood School District No. 1 in the County of Arapahoe | Englewood | PK–12 | 2,406 |
| Montezuma-Cortez School District No. Re-1 | Cortez | PK–12 | 2,380 |
| Elizabeth School District | Elizabeth | PK–12 | 2,282 |
| Gunnison Watershed School District Re1j | Gunnison | PK–12 | 2,095 |
| Alamosa School District No. Re-11j | Alamosa | K–12 | 2,038 |
| Weld County School District No. Re-2 | Eaton | K–12 | 2,000 |
| School District No. Re-1 Valley | Sterling | PK–12 | 1,910 |
| Moffat County School District Re: No. 1 | Craig | PK–12 | 1,821 |
| Bennett School District No. 29j | Bennett | PK–12 | 1,793 |
| Woodland Park School District No. Re-2 | Woodland Park | PK–12 | 1,744 |
| Weld County Reorganized School District No. Re-1 | Gilcrest | PK–12 | 1,727 |
| Archuleta County School District No. 50 Jt | Pagosa Springs | K–12 | 1,588 |
| Aspen School District No. 1 in the County of Pitkin and Sta | Aspen | PK–12 | 1,584 |
| School District No. Re-2 Brush | Brush | PK–12 | 1,420 |
| Lamar School District No. Re-2 | Lamar | PK–12 | 1,397 |
| Salida School District No. R-32 | Salida | PK–12 | 1,351 |
| East Grand School District No. 2 | Granby | PK–12 | 1,300 |
| Fremont Re-2 | Florence | PK–12 | 1,294 |
| East Otero School District No. R1 | La Junta | K–12 | 1,284 |
| Grand Valley School District No. 16 in the County of Garfi | Parachute | PK–12 | 1,212 |
| Weld County School District No. Re-7 | Kersey | PK–12 | 1,195 |
| Bayfield School District No. 10jt-R | Bayfield | PK–12 | 1,183 |
| Strasburg School District 31j | Strasburg | PK–12 | 1,180 |
| Manitou Springs School District No. 14 in the County of El | Manitou Springs | PK–12 | 1,147 |
| Sheridan School District No. 2 | Englewood | PK–12 | 1,018 |
| Ellicott School District No. 22 in the County of El Paso A | Ellicott | PK–12 | 1,009 |
| Weld County School District No. Re-9 | Ault | K–12 | 976 |
| Monte Vista School District No. C-8 | Monte Vista | PK–12 | 975 |
| Lake County School District No. R-1 | Leadville | PK–12 | 931 |
| North Conejos School District No. Re1j | La Jara | PK–12 | 927 |
| Buena Vista School District No. R-31 | Buena Vista | PK–12 | 925 |
| School District No. Re-50 Wiggins | Wiggins | PK–12 | 913 |
| Las Animas School District No. Re-1 | Las Animas | PK–12 | 906 |
| Estes Park School District R-3 | Estes Park | PK–12 | 882 |
| Yuma 1 School District | Yuma | PK–12 | 802 |
| Telluride School District No. R-1 | Telluride | PK–12 | 802 |
| Trinidad School District 1 in the County of Las Animas and | Trinidad | K–12 | 769 |
| Burlington Public School District No. Re-6j | Burlington | PK–12 | 742 |
| Wray Rd-2 School District | Wray | PK–12 | 731 |
| Platte Canyon School District No. 1 of the County of Park | Bailey | PK–12 | 688 |
| Meeker School District Re1 | Meeker | PK–12 | 672 |
| Dolores School District No. Re-4a | Dolores | PK–12 | 668 |
| Julesburg School District No. Re1 | Julesburg | PK–12 | 668 |
| Clear Creek School District No. Re-1 | Idaho Springs | PK–12 | 634 |
| Ignacio School District No. 11jt | Ignacio | PK–12 | 633 |
| Center Consolidated School District No. 26 Jt. of the Count | Center | PK–12 | 628 |
| Peyton School District No. 23 in the County of El Paso and | Peyton | PK–12 | 596 |
| Rocky Ford School District No. R2 | Rocky Ford | K–12 | 576 |
| Park County School District No. Re-2 | Fairplay | PK–12 | 576 |
| Holyoke School District No. Re-1j | Holyoke | K–12 | 512 |
| Mancos School District Re-6 | Mancos | PK–12 | 511 |
| Rangely School District Re4 | Rangely | PK–12 | 485 |
| Branson Reorganized School District No. 82 | Branson | PK–12 | 465 |
| Limon School District No. Re 4j | Limon | K–12 | 451 |
| Hayden School District No. Re 1 | Hayden | PK–12 | 444 |
| Huerfano School District Re-1 | Walsenburg | PK–12 | 442 |
| Calhan District No. Rj1 | Calhan | PK–12 | 414 |
| Akron School District No. R-1 | Akron | PK–12 | 411 |
| Miami-Yoder Joint District No. 60 of the Counties of El Pas | Rush | PK–12 | 398 |
| Gilpin County School District No. Re-1 | Black Hawk | PK–12 | 392 |
| West Grand School District No. 1 | Kremmling | K–12 | 385 |
| Sanford School District No. 6 in the County of Conejos and | Sanford | PK–12 | 384 |
| Denver 1 | Denver | K–12 | 382 |
| Upper Rio Grande School District C-7 | Del Norte | K–12 | 360 |
| Fowler School District No. R4j | Fowler | K–12 | 342 |
| Crowley County School District No. Re-1-J | Ordway | K–12 | 330 |
| Big Sandy School District No. 100j | Simla | PK–12 | 329 |
| Deer Trail School District No. 26j | Deer Trail | PK–12 | 327 |
| South Routt School District No. Re 3 | Oak Creek | PK–12 | 326 |
| Ridgway School District No. R-2 of the County of Ouray A | Ridgway | PK–12 | 320 |
| School District No. Re-4 Buffalo | Merino | K–12 | 314 |
| Custer County School District Consolidate 1 | Westcliffe | PK–12 | 313 |
| Sierra Grande School District No. R-30 | Blanca | PK–12 | 307 |
| Plateau Valley School District No. 50 in the County of Mesa | Collbran | PK–12 | 303 |
| Cripple Creek-Victor School District No. Re-1 | Cripple Creek | PK–12 | 298 |
| Haxtun School District No. Re-2j | Haxtun | PK–12 | 297 |
| Sargent School District No. Re-33j | Monte Vista | K–12 | 293 |
| School District No. C-2 in the County of Elbert and State of | Kiowa | PK–12 | 292 |
| Swink School District No. 33 in the County of Otero and St | Swink | K–12 | 290 |
| Springfield School District No. Re-4 | Springfield | PK–12 | 284 |
| Elbert School District No. 200 | Elbert | PK–12 | 277 |
| Holly School District No. Re-3 | Holly | PK–12 | 276 |
| Hoehne Reorganized School District No. 3 | Trinidad | PK–12 | 271 |
| Wiley School District No. Re-13 Jt | Wiley | PK–12 | 270 |
| Hanover School District No. 28 in the County of El Paso An | Colorado Springs | PK–12 | 264 |
| Dolores County School District Re-2j | Dove Creek | PK–12 | 262 |
| West End School District No. Re-2 | Nucla | PK–12 | 260 |
| Sangre De Cristo School District No. Re-22j | Mosca | PK–12 | 256 |
| La Veta School District Re-2 | La Veta | PK–12 | 238 |
| Mcclave School District No. Re-2 | Mc Clave | PK–12 | 231 |
| School District No. Re-3 Frenchman | Fleming | PK–12 | 221 |
| Genoa-Hugo School District No. C-113 | Hugo | PK–12 | 220 |
| School District No. R-4 in the County of Kit Carson and Stat | Stratton | PK–12 | 219 |
| School District No. Re-20 Weldon Valley | Weldona | PK–12 | 215 |
| Primero Reorganized School District No. 2 | Weston | PK–12 | 213 |
| Kiowa County School District No. Re-1 | Eads | PK–12 | 211 |
| Granada School District No. Re-1 | Granada | PK–12 | 210 |
| Cheraw School District No. 31 in the County of Otero and S | Cheraw | PK–12 | 209 |
| School District No. Re-5 Plateau | Peetz | PK–12 | 204 |
| Moffat School District No. 2 in the County of Saguache and | Moffat | PK–12 | 199 |
| South Conejos School District No. Re10 | Antonito | PK–12 | 196 |
| Otis School District No. R-3 | Otis | PK–12 | 192 |
| Norwood School District No. R-2j | Norwood | PK–12 | 191 |
| Centennial School District No. R-1 | San Luis | PK–12 | 186 |
| Arriba-Flagler Consolidated School District No. 20 | Flagler | PK–12 | 186 |
| Colorado River Boces | Parachute | 9–12 | 181 |
| Ouray School District No. R-1 of the County of Ouray and | Ouray | PK–12 | 180 |
| De Beque Joint District No. 49 of the Counties of Mesa and | De Beque | PK–12 | 179 |
| Walsh School District No. Re-1 | Walsh | PK–12 | 177 |
| Manzanola Joint District No. 3j of the Counties of Otero A | Manzanola | PK–12 | 174 |
| Cheyenne County School District No. Re-5 | Cheyenne Wells | PK–12 | 174 |
| School District No. Re-10 in the County of Weld and State O | Briggsdale | PK–12 | 172 |
| Colorado School for the Deaf and Blind | Colorado Springs | PK–12 | 167 |
| School District No. Re-11 in the County of Weld and State of | New Raymer | PK–12 | 163 |
| Fremont Re-3 | Cotopaxi | PK–12 | 155 |
| Idalia Rj-3 School District | Idalia | PK–12 | 150 |
| Revere School District | Ovid | PK–12 | 144 |
| North Park School District R-1 | Walden | PK–12 | 144 |
| Aguilar Reorganized School District No. 6 | Aguilar | PK–12 | 127 |
| Centennial Boces | Greeley | 10–12 | 122 |
| Lone Star School District No. 101 | Otis | K–12 | 119 |
| Kit Carson School District No. R-1 | Kit Carson | PK–12 | 109 |
| Mountain Valley School District No. Re 1 | Saguache | PK–12 | 105 |
| Bethune School District No. R- 5 | Bethune | PK–12 | 99 |
| Hi-Plains R-23 | Seibert | PK–12 | 96 |
| Creede School District | Creede | PK–12 | 92 |
| Agate School District No. 300 | Agate | PK–12 | 85 |
| Arickaree School District No. R-2 | Anton | PK–12 | 82 |
| Liberty J-4 School District | Joes | PK–12 | 76 |
| Hinsdale County School District No. Re-1 | Lake City | PK–12 | 75 |
| Woodlin School District No. R-104 | Woodrow | PK–12 | 74 |
| Silverton School District No. 1 in the County of San Juan | Silverton | PK–12 | 72 |
| Pritchett School District No. Re-3 | Pritchett | PK–12 | 64 |
| School District No. Re-12 in the County of Weld and State of | Grover | PK–12 | 61 |
| Edison Joint District No. 54 of the Counties of El Paso and | Yoder | PK–12 | 56 |
| Vilas School District Re-5 | Vilas | PK–12 | 53 |
| San Juan Boces | Durango | 6–12 | 48 |
| Campo School District No. Re-6 | Campo | PK–12 | 47 |
| Kiowa County School District No. Re-2 | Sheridan Lake | PK–12 | 32 |
| Karval School District No. Re 23 | Karval | PK–12 | 29 |
| Kim Reorganized School District No. 88 | Kim | PK–12 | 25 |
| San Juan Boces Au | Durango | — | — |
| Northeast Boces | Haxtun | — | — |
| Mountain Boces | Buena Vista | — | — |
| East Central Boces | Limon | — | — |
| Southeastern Boces | Lamar | — | — |
| South Central Boces | Pueblo West | — | — |
| Rio Blanco Boces | Rangely | — | — |
| Pikes Peak Boces | Colorado Springs | — | — |
| San Luis Valley Boces | Alamosa | — | — |
| Northwest Colorado Boces | Steamboat Springs | — | — |
| El Paso 8 Fountain Au | Fountain | — | — |
| Roaring Fork School District Au | Carbondale | — | — |
| Education Reenvisioned Boces Au | Monument | — | — |
| Colorado River Boces Au | Parachute | — | — |
| Grand Valley Boces | Grand Junction | — | — |
| Blue Sky Boces | Bailey | — | — |
| Uncompahgre Boces | Ridgway | — | — |
| Santa Fe Trail Boces | La Junta | — | — |
| Front Range Boces | Boulder | — | — |
| Fremont Re-1 Canon City Au | Canon City | — | — |
| East Central Boces Au | Limon | — | — |
| Blue Sky Boces Au | Bailey | — | — |
| Delta 50j Au | Delta | — | — |
| Gunnison Re-1j Au | Gunnison | — | — |
| South Central Boces Au | Pueblo West | — | — |
| El Paso County Colorado School District 49 Au | Colorado Springs | — | — |
| Denver 1 Au | Denver | — | — |
| Weld Re-4 Windsor Au | Windsor | — | — |
| Douglas Re-1 Au | Castle Rock | — | — |
| San Luis Valley Boces Au | Alamosa | — | — |
| Department of Corrections | Colorado Springs | 9–12 | — |
| Division of Youth Services | Denver | 5–12 | — |
| Durango 9-R Au | Durango | — | — |
| Aspen 1 Au | Aspen | — | — |
| Colorado Mental Health Hospital in Pueblo | Pueblo | — | — |
| Elizabeth School District Au | Elizabeth | — | — |
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| Weld Re-5j Johnstown-Milliken Au | Milliken | — | — |
| Colorado School for the Deaf and Blind Au | Colorado Springs | — | — |
| El Paso 11 Colo Springs Au | Colorado Springs | — | — |
| Summit Re-1 Au | Frisco | — | — |
| Larimer R-1 Poudre Au | Fort Collins | — | — |
| Northwest Boces Au | Steamboat Springs | — | — |
| Arapahoe 5 Cherry Creek Au | Greenwood Village | — | — |
| Mesa 51 Grand Junction Au | Grand Junction | — | — |
| Morgan Re-3 Fort Morgan Au | Fort Morgan | — | — |
| Adams 27j School District 27j Au | Brighton | — | — |
| El Paso 2 Harrison Au | Colorado Springs | — | — |
| Larimer R-2j Thompson Au | Loveland | — | — |
| Logan Re-1 Valley Au | Sterling | — | — |
| Division of Youth Services Au | Denver | — | — |
| El Paso 38 Lewis Palmer Au | Monument | — | — |
| Department of Corrections Au | Colorado Springs | — | — |
| Northeast Boces Au | Haxtun | — | — |
| Arapahoe 2 Sheridan Au | Sheridan | — | — |
| Boulder Re-2 Boulder Au | Boulder | — | — |
| Centennial Boces Au | Greeley | — | — |
| El Paso 20 Academy Au | Colorado Springs | — | — |
| Arapahoe 6 Littleton Au | Littleton | — | — |
| El Paso 3 Widefield Au | Colorado Springs | — | — |
| Jefferson R-1 Au | Golden | — | — |
| Pueblo 60 Urban Au | Pueblo | — | — |
| Ute Pass Boces | Manitou Springs | — | — |
| Adams County Boces | Westminster | — | — |
| Pueblo 70 Rural Au | Pueblo | — | — |
| Rio Blanco Boces Au | Rangely | — | — |
| Pikes Peak Boces Au | Colorado Springs | — | — |
| Ute Pass Boces Au | Woodland Park | — | — |
| Mountain Boces Au | Carbondale | — | — |
| Arapahoe 1 Englewood Au | Englewood | — | — |
| Adams 14 Commerce City Au | Commerce City | — | — |
| Santa Fe Trail Boces Au | La Junta | — | — |
| Weld 6 Greeley Au | Greeley | — | — |
| Montrose Re-1j Au | Montrose | — | — |
| Adams 12 Northglenn Au | Thornton | — | — |
| Larimer R-3 Park Au | Estes Park | — | — |
| Charter School Institute Au | Denver | — | — |
| Fort Lupton/keenesburg Au | Keenesburg | — | — |
| El Paso 12 Cheyenne Mountain Au | Colorado Springs | — | — |
| Boulder Re-1j St Vrain Au | Longmont | — | — |
| Uncompahgre Boces Au | Ridgway | — | — |
| Colorado Mental Health Institute Pueblo Au | Pueblo | — | — |
| Adams 1 Mapleton Au | Denver | — | — |
| Westminster Public Schools Au | Westminster | — | — |
| Southeastern Boces Au | Lamar | — | — |
| Adams-Arap 28j Aurora Au | Aurora | — | — |
| Moffat Re-1 Craig Au | Craig | — | — |
| Steamboat Springs School District Au | Steamboat Springs | — | — |