Secondary School Gross Enrolment (number)
| 1990 | 1999 |
| Machakos | 56,206 | 27,534 |
| Muranga | 29,225 | 24,009 |
| Kakamega | 57,972 | 23,194 |
| Bungoma | 22,732 | 21,273 |
| Kericho | 22,191 | 16,257 |
| Kiambu | 39,666 | 15,893 |
| Nyeri | 31,601 | 13,182 |
| Kisumu | 17,756 | 12,053 |
| Nairobi | 36,936 | 11,882 |
| Nakuru | 27,172 | 11,178 |
| Kitui | 13,747 | 9,032 |
| Embu | 11,742 | 8,554 |
| Nyandarua | 11,047 | 8,121 |
| Siaya | 14,611 | 7,258 |
| Nandi | 10,823 | 7,101 |
| Baringo | 10,686 | 6,463 |
| Kirinyaga | 13,132 | 6,089 |
| Uasin Gishu | 11,349 | 6,081 |
| Kilifi | 9,204 | 6,021 |
| Trans Nzoia | 6,077 | 4,780 |
| Busia | 8,160 | 4,155 |
| Taita Taveta | 11,593 | 3,963 |
| Laikipia | 7,517 | 3,941 |
| Mombasa | 11,242 | 3,234 |
| Kajiado | 4,955 | 3,114 |
| Kwale | 5,202 | 2,919 |
| Narok | 3,707 | 2,877 |
| West Pokot | 3,020 | 1,842 |
| Garissa | 1,145 | 1,667 |
| Turkana | 1,395 | 1,476 |
| Wajir | 1,220 | 1,131 |
| Samburu | 1,366 | 1,032 |
| Tana River | 2,766 | 1,023 |
| Marsabit | 1,337 | 953 |
| Mandera | 1,026 | 901 |
| Isiolo | 1,178 | 783 |
| Lamu | 1,470 | 562 |