This is a list of all county codes in Kenya. The geographical units were envisioned by the 2010 Constitution of Kenya as the units of devolved government. Turkana County is the largest county in Kenya while Mombasa county is the smallest county in Kenya by size.
Below is a list of all county codes in Kenya as envisioned by the 2010 Constitution of Kenya.
| Code | County |
| 001 | Mombasa |
| 002 | Kwale |
| 003 | Kilifi |
| 004 | Tana River |
| 005 | Lamu |
| 006 | Taita–Taveta |
| 007 | Garissa |
| 008 | Wajir |
| 009 | Mandera |
| 010 | Marsabit |
| 011 | Isiolo |
| 012 | Meru |
| 013 | Tharaka-Nithi |
| 014 | Embu |
| 015 | Kitui |
| 016 | Machakos |
| 017 | Makueni |
| 018 | Nyandarua |
| 019 | Nyeri |
| 020 | Kirinyaga |
| 021 | Murang’a |
| 022 | Kiambu |
| 023 | Turkana |
| 024 | West Pokot |
| 025 | Samburu |
| 027 | Trans-Nzoia |
| 026 | Uasin Gishu |
| 028 | Elgeyo-Marakwet |
| 029 | Nandi |
| 030 | Baringo |
| 031 | Laikipia |
| 032 | Nakuru |
| 033 | Narok |
| 034 | Kajiado |
| 035 | Kericho |
| 036 | Bomet |
| 037 | Kakamega |
| 038 | Vihiga |
| 039 | Bungoma |
| 040 | Busia |
| 041 | Siaya |
| 042 | Kisumu |
| 043 | Homa Bay |
| 044 | Migori |
| 045 | Kisii |
| 046 | Nyamira |
| 047 | Nairobi |
