| Denver Public Schools | 87,883 | Aug 31 | May 28 | Estimated |
| Jefferson County School District No. R-1 | 75,327 | Aug 31 | May 28 | Estimated |
| Aurora Public Schools | 38,000 | Aug 31 | May 28 | Estimated |
| Adams 12 Five Star Schools | 34,998 | Aug 11 | May 20 | Estimated |
| St. Vrain Valley School District No. Re1J | 31,894 | Aug 18 | May 27 | Estimated |
| Poudre School District R-1 | 29,977 | Aug 31 | May 28 | Estimated |
| Boulder Valley School District No. Re2 | 28,485 | Aug 31 | May 28 | Estimated |
| Academy School District No. 20 in the county of El Paso an | 25,719 | Aug 3 | Jun 3 | Estimated |
| El Paso County Colorado School District 49 | 24,515 | Aug 3 | Jun 3 | Estimated |
| Colorado Springs School District No. 11 | 22,725 | Aug 31 | May 28 | Estimated |
| School District 27J | 22,713 | Aug 31 | May 28 | Estimated |
| Greeley School District No. 6 | 22,200 | Aug 31 | May 28 | Estimated |
| Mesa County Valley School District No. 51 | 20,762 | Aug 31 | May 28 | Estimated |
| Thompson School District R-2J | 15,083 | Aug 20 | May 28 | Estimated |
| Pueblo School District No. 60 in the county of Pueblo and | 15,025 | Aug 31 | May 28 | Estimated |
| Littleton School District No. 6 in the county of Arapahoe | 13,450 | Aug 31 | May 28 | Estimated |
| Harrison School District No. 2 in the county of El Paso an | 12,267 | Aug 7 | May 26 | Estimated |
| Pueblo County School District 70 | 10,501 | Aug 31 | May 28 | Estimated |
| School District No. 3 in the county of El Paso and State of | 9,611 | Aug 3 | Jun 3 | Estimated |
| Weld County Reorganized School District No. Re-4 | 8,227 | Aug 31 | May 28 | Estimated |
| Fountain School District No. 8 in the county of El Paso an | 8,201 | Aug 3 | Jun 3 | Estimated |
| Westminster Public Schools | 7,631 | Aug 31 | May 28 | Estimated |
| Mapleton School District No. 1 in the county of Adams & St | 7,088 | Aug 31 | May 28 | Estimated |
| Eagle County School District No. Re 50 | 6,620 | Aug 18 | May 28 | Estimated |
| Lewis-Palmer Consolidated School District No. 38 in the co | 6,496 | Aug 31 | May 28 | Estimated |
| Montrose County School District Re-1J | 6,029 | Aug 17 | May 20 | Estimated |
| Roaring Fork School District No. Re-1 | 5,771 | Aug 12 | Jun 3 | Estimated |
| School District N. 14 in the county of Adams & State of Colo | 5,692 | Aug 11 | May 20 | Estimated |
| Durango School District No. 9-R | 5,452 | Aug 25 | Jun 16 | Estimated |
| Garfield School District No. Re-2 | 4,662 | Aug 31 | May 28 | Estimated |
| Delta County Joint District No. 50 | 4,592 | Aug 6 | Jun 4 | Estimated |
| Weld County School District No. Re-5J | 3,853 | Aug 31 | May 28 | Estimated |
| Cheyenne Mountain School District No. 12 in the county of E | 3,737 | Aug 31 | May 28 | Estimated |
| Summit School District No. Re 1 | 3,633 | Sep 8 | Jun 16 | Estimated |
| School District No. Re-3 Fort Morgan | 3,421 | Aug 31 | May 28 | Estimated |
| Fremont Re-1 | 3,305 | Aug 31 | May 28 | Estimated |
| Weld County School District RE-3J | 2,785 | Aug 31 | May 28 | Estimated |
| Steamboat Springs School District No. Re 2 | 2,664 | Aug 12 | Jun 3 | Estimated |
| Montezuma-Cortez School District No. Re-1 | 2,449 | Aug 31 | May 28 | Estimated |
| Elizabeth School District | 2,379 | Aug 13 | May 20 | Estimated |
| Alamosa School District No. Re-11J | 2,116 | Aug 31 | May 28 | Estimated |
| Moffat County School District RE: No. 1 | 2,092 | Aug 12 | Jun 3 | Estimated |
| Gunnison Watershed School District Re1J | 2,061 | Aug 24 | Jun 4 | Estimated |
| Woodland Park School District No. Re-2 | 2,010 | Aug 12 | Jun 3 | Estimated |
| Weld County School District No. Re-2 | 1,977 | Aug 31 | May 28 | Estimated |
| School District No. Re-1 Valley | 1,887 | Aug 31 | May 28 | Estimated |
| Weld County Reorganized School District No. Re-1 | 1,837 | Aug 31 | May 28 | Estimated |
| Archuleta County School District No. 50 Jt | 1,678 | Aug 31 | May 28 | Estimated |
| Bennett School District No. 29J | 1,645 | Aug 12 | Jun 3 | Estimated |
| Aspen School District No. 1 in the county of Pitkin and Sta | 1,554 | Aug 31 | May 28 | Estimated |
| School District No. Re-2 Brush | 1,429 | Aug 31 | May 28 | Estimated |
| Fremont Re-2 | 1,390 | Aug 31 | May 28 | Estimated |
| East Otero School District No. R1 | 1,326 | Aug 12 | Jun 3 | Estimated |
| Manitou Springs School District No. 14 in the county of El | 1,317 | Aug 31 | May 28 | Estimated |
| East Grand School District No. 2 | 1,283 | Aug 31 | May 28 | Estimated |
| Bayfield School District No. 10Jt-R | 1,253 | Aug 31 | May 28 | Estimated |
| Grand Valley School District No. 16 in the county of Garfi | 1,198 | Aug 31 | May 28 | Estimated |
| Strasburg School District 31J | 1,187 | Aug 31 | May 28 | Estimated |
| Weld County School District No. Re-7 | 1,177 | Aug 31 | May 28 | Estimated |
| Sheridan School District No. 2 | 1,125 | Aug 31 | May 28 | Estimated |
| Monte Vista School District No. C-8 | 1,009 | Aug 31 | May 28 | Estimated |
| Weld County School District No. Re-9 | 993 | Aug 31 | May 28 | Estimated |
| Buena Vista School District No. R-31 | 985 | Aug 31 | May 28 | Estimated |
| Ellicott School District No. 22 in the county of El Paso a | 981 | Aug 3 | Jun 3 | Estimated |
| Lake County School District No. R-1 | 975 | Aug 31 | May 28 | Estimated |
| Estes Park School District R-3 | 971 | Aug 31 | May 28 | Estimated |
| Las Animas School District No. Re-1 | 956 | Aug 31 | May 28 | Estimated |
| North Conejos School District No. Re1J | 955 | Aug 19 | Jun 11 | Estimated |
| School District No. Re-50 Wiggins | 880 | Aug 31 | May 28 | Estimated |
| Yuma 1 School District | 843 | Aug 31 | May 28 | Estimated |
| Burlington Public School District No. RE-6J | 762 | Aug 26 | Jun 9 | Estimated |
| Trinidad School District 1 in the county of Las Animas and | 744 | Aug 31 | May 28 | Estimated |
| Platte Canyon School District No. 1 of the county of Park | 740 | Aug 12 | Jun 3 | Estimated |
| Wray RD-2 School District | 733 | Aug 17 | Jun 2 | Estimated |
| Meeker School District Re1 | 720 | Aug 31 | May 28 | Estimated |
| Dolores School District No. Re-4A | 683 | Aug 31 | May 28 | Estimated |
| Clear Creek School District No. Re-1 | 680 | Aug 31 | May 28 | Estimated |
| Rocky Ford School District No. R2 | 632 | Aug 31 | May 28 | Estimated |
| Center Consolidated School District No. 26 Jt. of the count | 607 | Aug 31 | May 28 | Estimated |
| Julesburg School District No. Re1 | 607 | Aug 31 | Jun 10 | Estimated |
| Peyton School District No. 23 in the county of El Paso and | 600 | Aug 3 | Jun 3 | Estimated |
| Park County School District No. Re-2 | 595 | Aug 12 | Jun 3 | Estimated |
| Holyoke School District No. Re-1J | 552 | Aug 31 | May 28 | Estimated |
| Mancos School District Re-6 | 521 | Aug 31 | May 28 | Estimated |
| Rangely School District RE4 | 488 | Aug 18 | Jun 2 | Estimated |
| Huerfano School District Re-1 | 478 | Aug 13 | May 28 | Estimated |
| Limon School District No. Re 4J | 469 | Aug 11 | May 27 | Estimated |
| Hayden School District No. Re 1 | 454 | Sep 8 | Jun 24 | Estimated |
| Calhan District No. RJ1 | 436 | Aug 17 | Jun 10 | Estimated |
| Akron School District No. R-1 | 427 | Aug 31 | May 28 | Estimated |
| West Grand School District No. 1 | 409 | Aug 31 | May 28 | Estimated |
| Miami-Yoder Joint District No. 60 of the counties of El Pas | 406 | Aug 13 | Jun 3 | Estimated |
| Branson Reorganized School District No. 82 | 404 | Aug 31 | May 28 | Estimated |
| Sanford School District No. 6 in the county of Conejos and | 384 | Aug 31 | May 28 | Estimated |
| Crowley County School District No. Re-1-J | 379 | Aug 31 | May 28 | Estimated |
| Del Norte Consolidated School District No. C-7 | 371 | Aug 31 | May 28 | Estimated |
| Deer Trail School District No. 26J | 361 | Aug 31 | May 28 | Estimated |
| Fowler School District No. R4J | 347 | Aug 5 | May 27 | Estimated |
| Custer County School District Consolidate 1 | 345 | Aug 31 | May 28 | Estimated |
| School District No. C-2 in the county of Elbert and State of | 342 | Aug 31 | May 28 | Estimated |
| South Routt School District No. Re 3 | 338 | Aug 6 | May 26 | Estimated |
| Ridgway School District No. R-2 of the county of Ouray a | 330 | Aug 31 | May 28 | Estimated |
| Big Sandy School District No. 100J | 328 | Aug 31 | Jun 10 | Estimated |
| School District No. Re-4 Buffalo | 322 | Sep 8 | Jun 24 | Estimated |
| Plateau Valley School District No. 50 in the county of Mesa | 309 | Aug 31 | May 28 | Estimated |
| Haxtun School District No. Re-2J | 307 | Aug 5 | May 27 | Estimated |
| Springfield School District No. Re-4 | 304 | Aug 31 | May 28 | Estimated |
| Swink School District No. 33 in the county of Otero and St | 302 | Aug 31 | May 28 | Estimated |
| Sierra Grande School District No. R-30 | 302 | Aug 31 | May 28 | Estimated |
| Sargent School District No. Re-33J | 297 | Aug 31 | May 28 | Estimated |
| Cripple Creek-Victor School District No. Re-1 | 284 | Aug 31 | May 28 | Estimated |
| Elbert School District No. 200 | 281 | Aug 3 | May 19 | Estimated |
| Sangre de Cristo School District No. Re-22J | 277 | Aug 4 | May 25 | Estimated |
| Hanover School District No. 28 in the county of El Paso an | 271 | Aug 31 | May 28 | Estimated |
| Holly School District No. Re-3 | 267 | Aug 18 | May 20 | Estimated |
| Wiley School District No. Re-13 Jt | 266 | Sep 3 | Jun 11 | Estimated |
| West End School District No. Re-2 | 260 | Aug 10 | May 27 | Estimated |
| Dolores County School District RE-2J | 252 | Aug 31 | May 28 | Estimated |
| Primero Reorganized School District No. 2 | 251 | Aug 31 | Jun 9 | Estimated |
| School District No. Re-20 Weldon Valley | 235 | Sep 8 | Jun 24 | Estimated |
| McClave School District No. Re-2 | 231 | Aug 31 | May 28 | Estimated |
| Genoa-Hugo School District No. C-113 | 229 | Aug 31 | May 28 | Estimated |
| Cheraw School District No. 31 in the county of Otero and S | 221 | Aug 18 | May 20 | Estimated |
| School District No. Re-3 Frenchman | 221 | Aug 18 | May 20 | Estimated |
| School District No. R-4 in the county of Kit Carson and Stat | 219 | Aug 31 | May 28 | Estimated |
| La Veta School District Re-2 | 218 | Aug 31 | May 28 | Estimated |
| Granada School District No. Re-1 | 213 | Aug 31 | May 28 | Estimated |
| Otis School District No. R-3 | 201 | Aug 31 | Jul 30 | Estimated |
| Centennial School District No. R-1 | 193 | Aug 31 | May 28 | Estimated |
| Fremont Re-3 | 190 | Aug 31 | May 28 | Estimated |
| Norwood School District No. R-2J | 189 | Aug 31 | May 28 | Estimated |
| South Conejos School District No. Re10 | 182 | Aug 31 | May 28 | Estimated |
| Manzanola Joint District No. 3J of the counties of Otero a | 180 | Aug 31 | Jun 10 | Estimated |
| School District No. Re-11 in the county of Weld and State of | 178 | Sep 2 | Jun 11 | Estimated |
| Cheyenne County School District No. Re-5 | 178 | Aug 31 | May 28 | Estimated |
| School District No. Re-5 Plateau | 178 | Sep 8 | Jun 24 | Estimated |
| Arriba-Flagler Consolidated School District No. 20 | 175 | Aug 10 | May 27 | Estimated |
| Ouray School District No. R-1 of the county of Ouray and | 169 | Aug 13 | May 25 | Estimated |
| De Beque Joint District No. 49 of the counties of Mesa and | 166 | Aug 31 | May 28 | Estimated |
| North Park School District R-1 | 155 | Aug 18 | May 20 | Estimated |
| Mountain Valley School District No. Re 1 | 147 | Aug 31 | May 28 | Estimated |
| Lone Star School District No. 101 | 125 | Aug 24 | May 14 | Estimated |
| Aguilar Reorganized School District No. 6 | 117 | Aug 31 | Jun 10 | Estimated |
| Bethune School District No. R- 5 | 110 | Sep 2 | Jun 22 | Estimated |
| Kit Carson School District No. R-1 | 100 | Aug 31 | May 28 | Estimated |
| Silverton School District No. 1 in the county of San Juan | 75 | Aug 10 | May 20 | Estimated |
| Agate School District No. 300 | 75 | | | Estimated |
| Edison Joint District No. 54 of the counties of El Paso and | 73 | Aug 3 | Jun 3 | Estimated |
| Vilas School District Re-5 | 69 | Sep 8 | Jun 24 | Estimated |
| Liberty J-4 School District | 68 | Aug 4 | May 21 | Estimated |
| School District No. Re-12 in the county of Weld and State of | 65 | | | Estimated |
| Pritchett School District No. Re-3 | 61 | | | Estimated |
| Karval School District No. Re 23 | 40 | Sep 8 | Jun 24 | Estimated |
| Campo School District No. Re-6 | 31 | Oct 30 | Jun 11 | Estimated |
| Kiowa County School District No. Re-2 | 30 | | | Estimated |
| Kim Reorganized School District No. 88 | 26 | | | Estimated |