| Election Name: | 2006 California SPI election |
| Country: | California |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 2002 California Superintendent of Public Instruction election |
| Previous Year: | 2002 |
| Next Election: | 2010 California Superintendent of Public Instruction election |
| Next Year: | 2010 |
| Election Date: | June 6, 2006 |
| Image1: | File:Jack O'Connell.jpg |
| Candidate1: | Jack O'Connell |
| Party1: | Nonpartisan politician |
| Popular Vote1: | 2,116,243 |
| Percentage1: | 52.4% |
| Candidate2: | Sarah L. Knopp |
| Party2: | Nonpartisan politician |
| Popular Vote2: | 695,394 |
| Percentage2: | 17.2% |
| Image3: | 3x4.svg |
| Candidate3: | Diane A. Lenning |
| Party3: | Nonpartisan politician |
| Popular Vote3: | 573,576 |
| Percentage3: | 14.2% |
| Candidate4: | Daniel L. Bunting |
| Party4: | Nonpartisan candidate |
| Popular Vote4: | 338,182 |
| Percentage4: | 8.4% |
| Candidate5: | Grant McMicken |
| Party5: | Nonpartisan candidate |
| Popular Vote5: | 317,567 |
| Percentage5: | 7.9% |
| Map Size: | 300px |
| SPI | |
| Before Election: | Jack O'Connell |
| Before Party: | Democratic Party (United States) |
| After Election: | Jack O'Connell |
| After Party: | Democratic Party (United States) |
The 2006 California Superintendent of Public Instruction election occurred on June 6, 2006. Incumbent Jack O'Connell defeated Daniel L. Bunting, Sarah L. Knopp, Diane A. Lenning, and Grant McMicken to win a second term, winning at least a plurality in every county.
| County | O'Connell | Votes | Knopp | Votes | Lenning | Votes | Bunting | Votes | McMicken | Votes | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Santa Barbara | 76.05% | 60,224 | 7.90% | 6,253 | 7.42% | 5,875 | 4.05% | 3,208 | 4.58% | 3,629 | |
| San Luis Obispo | 75.39% | 43,560 | 8.81% | 5,093 | 7.51% | 4,340 | 4.45% | 2,574 | 3.83% | 2,213 | |
| Ventura | 66.53% | 70,342 | 10.56% | 11,168 | 12.13% | 12,824 | 5.64% | 5,959 | 5.15% | 5,442 | |
| Colusa | 65.94% | 2,242 | 11.71% | 398 | 10.94% | 372 | 6.26% | 213 | 5.15% | 175 | |
| San Francisco | 64.06% | 65,618 | 17.12% | 17,536 | 8.06% | 8,256 | 4.86% | 4,980 | 5.89% | 6,037 | |
| Marin | 60.69% | 30,040 | 16.67% | 8,249 | 11.55% | 5,719 | 4.73% | 2,343 | 6.35% | 3,145 | |
| Yolo | 59.57% | 17,350 | 18.33% | 5,340 | 10.36% | 3,016 | 6.13% | 1,784 | 5.62% | 1,636 | |
| Monterey | 59.21% | 27,284 | 16.52% | 7,614 | 11.34% | 5,224 | 6.88% | 3,171 | 6.05% | 2,786 | |
| Santa Cruz | 58.78% | 26,145 | 20.71% | 9,210 | 9.71% | 4,319 | 5.02% | 2,231 | 5.79% | 2,576 | |
| Napa | 57.51% | 14,819 | 16.30% | 4,200 | 13.28% | 3,422 | 6.55% | 1,688 | 6.35% | 1,637 | |
| Merced | 57.26% | 10,830 | 14.96% | 2,829 | 14.51% | 2,744 | 7.33% | 1,386 | 5.95% | 1,126 | |
| Sacramento | 55.81% | 98,112 | 14.23% | 25,021 | 13.48% | 23,697 | 7.61% | 13,385 | 8.86% | 15,572 | |
| Alameda | 55.75% | 115,797 | 20.67% | 42,929 | 10.16% | 21,111 | 5.89% | 12,239 | 7.53% | 15,648 | |
| Sutter | 55.79% | 7,088 | 15.86% | 2,015 | 14.53% | 1,846 | 7.45% | 947 | 6.37% | 809 | |
| Modoc | 55.32% | 1,653 | 17.27% | 516 | 14.12% | 422 | 6.63% | 198 | 6.66% | 199 | |
| Fresno | 55.03% | 46,531 | 14.99% | 12,675 | 13.32% | 11,265 | 10.13% | 8,568 | 6.52% | 5,513 | |
| Siskiyou | 54.53% | 5,445 | 16.78% | 1,675 | 13.36% | 1,334 | 7.92% | 791 | 7.41% | 740 | |
| San Benito | 54.42% | 4,560 | 19.00% | 1,592 | 12.77% | 1,070 | 7.35% | 616 | 6.46% | 541 | |
| Glenn | 53.87% | 3,002 | 15.75% | 878 | 14.88% | 829 | 8.27% | 461 | 7.23% | 403 | |
| Contra Costa | 53.74% | 79,096 | 16.78% | 24,703 | 14.10% | 20,750 | 7.66% | 11,269 | 7.72% | 11,357 | |
| Stanislaus | 53.29% | 29,413 | 15.15% | 8,361 | 14.89% | 8,218 | 8.24% | 4,550 | 8.42% | 4,648 | |
| San Joaquin | 53.09% | 36,853 | 15.68% | 10,887 | 14.90% | 10,347 | 8.20% | 5,691 | 8.13% | 5,642 | |
| Butte | 52.94% | 19,722 | 19.19% | 7,149 | 11.73% | 4,370 | 8.72% | 3,250 | 7.41% | 2,759 | |
| San Mateo | 52.44% | 47,430 | 19.59% | 17,724 | 11.68% | 10,563 | 8.29% | 7,503 | 8.00% | 7,233 | |
| Yuba | 52.20% | 4,596 | 19.33% | 1,702 | 12.81% | 1,128 | 8.08% | 711 | 7.58% | 667 | |
| Sierra | 51.70% | 607 | 19.93% | 234 | 10.82% | 127 | 9.54% | 112 | 8.01% | 94 | |
| Plumas | 51.74% | 2,793 | 18.80% | 1,015 | 12.54% | 677 | 8.56% | 462 | 8.35% | 451 | |
| Solano | 51.79% | 28,305 | 21.52% | 11,763 | 10.74% | 5,872 | 9.27% | 5,068 | 6.67% | 3,648 | |
| Tehama | 51.79% | 5,855 | 16.17% | 1,828 | 12.94% | 1,463 | 12.07% | 1,365 | 7.03% | 795 | |
| Santa Clara | 51.08% | 103,889 | 18.28% | 37,177 | 13.86% | 28,190 | 8.22% | 16,727 | 8.56% | 17,412 | |
| Lassen | 50.79% | 2,904 | 21.42% | 1,225 | 11.93% | 682 | 8.97% | 513 | 6.89% | 394 | |
| Shasta | 50.67% | 16,443 | 17.47% | 5,669 | 15.00% | 4,869 | 9.19% | 2,984 | 7.67% | 2,489 | |
| Nevada | 50.45% | 11,028 | 23.13% | 5,057 | 11.48% | 2,510 | 7.41% | 1,619 | 7.53% | 1,645 | |
| Los Angeles | 50.29% | 385,495 | 18.91% | 144,966 | 13.86% | 106,266 | 8.28% | 63,480 | 8.65% | 66,344 | |
| Sonoma | 50.19% | 50,063 | 20.51% | 20,459 | 13.04% | 13,009 | 9.05% | 9,028 | 7.21% | 7,188 | |
| Kern | 49.95% | 44,713 | 13.77% | 12,329 | 20.39% | 18,251 | 8.78% | 7,856 | 7.12% | 6,371 | |
| Tulare | 49.45% | 17,990 | 15.34% | 5,581 | 13.47% | 4,902 | 13.94% | 5,072 | 7.79% | 2,835 | |
| Tuolumne | 49.40% | 6,067 | 17.09% | 2,099 | 13.35% | 1,640 | 10.00% | 1,228 | 10.15% | 1,247 | |
| Amador | 48.95% | 4,413 | 16.30% | 1,470 | 12.61% | 1,137 | 10.68% | 963 | 11.46% | 1,033 | |
| Imperial | 48.58% | 7,731 | 14.71% | 2,341 | 13.45% | 2,140 | 10.51% | 1,672 | 12.76% | 2,031 | |
| Riverside | 48.27% | 79,773 | 14.84% | 24,524 | 15.49% | 25,610 | 11.39% | 18,819 | 10.02% | 16,555 | |
| San Bernardino | 48.12% | 72,337 | 19.83% | 29,814 | 14.15% | 21,265 | 9.99% | 15,018 | 7.91% | 11,898 | |
| Placer | 47.35% | 30,249 | 15.19% | 9,705 | 20.36% | 13,011 | 9.81% | 6,266 | 7.29% | 4,659 | |
| Mendocino | 47.05% | 8,789 | 22.86% | 4,271 | 15.36% | 2,869 | 7.16% | 1,337 | 7.57% | 1,414 | |
| Calaveras | 46.97% | 4,543 | 18.14% | 1,755 | 12.53% | 1,212 | 11.37% | 1,100 | 10.99% | 1,063 | |
| Orange | 46.59% | 143,799 | 14.64% | 45,190 | 21.76% | 67,151 | 8.63% | 26,631 | 8.38% | 25,868 | |
| Madera | 46.58% | 7,491 | 17.45% | 2,806 | 13.15% | 2,114 | 12.98% | 2,087 | 9.84% | 1,583 | |
| San Diego | 46.11% | 165,199 | 18.69% | 66,965 | 16.49% | 59,092 | 10.71% | 38,364 | 8.00% | 28,652 | |
| El Dorado | 45.85% | 15,228 | 18.01% | 5,982 | 14.92% | 4,957 | 11.56% | 3,839 | 9.66% | 3,207 | |
| Lake | 45.80% | 5,058 | 19.78% | 2,184 | 16.86% | 1,862 | 8.69% | 960 | 8.87% | 980 | |
| Kings | 45.43% | 5,816 | 15.25% | 1,952 | 17.74% | 2,271 | 11.38% | 1,457 | 10.19% | 1,305 | |
| Humboldt | 45.02% | 13,267 | 24.68% | 7,273 | 15.07% | 4,442 | 7.78% | 2,293 | 7.45% | 2,197 | |
| Mariposa | 44.61% | 2,002 | 19.10% | 857 | 12.50% | 561 | 11.34% | 509 | 12.46% | 559 | |
| Trinity | 44.63% | 1,626 | 20.26% | 738 | 16.52% | 602 | 8.54% | 311 | 10.05% | 366 | |
| Del Norte | 43.57% | 2,160 | 19.75% | 979 | 17.17% | 851 | 10.31% | 511 | 9.20% | 456 | |
| Mono | 42.46% | 1,019 | 21.46% | 515 | 15.92% | 382 | 9.25% | 222 | 10.92% | 262 | |
| Inyo | 42.39% | 1,702 | 21.69% | 871 | 11.93% | 479 | 14.00% | 562 | 9.99% | 401 | |
| Alpine | 41.27% | 137 | 25.00% | 83 | 14.76% | 49 | 9.34% | 31 | 9.64% | 32 |