Located in central Kenya, it borders Murang’a county to the north and north east, Machakos county to the east, Nairobi and Kajiado counties to the south, Nakuru county to the west, and Nyandarua county to the north west.
Temperatures range from a minimum of 12.8°C to a maximum of 24.6°C with an average of 18.7°C. The average rainfall is 989mm per annum.
Bitumen surface (1,358km), gravel surface (682.6km), earth surface (430.1km)
Population density: 638 people per km2
National percentage: 4.20 per cent
Annual growth rate: 2.56
County capital: Kiambu Town (proposed)
Constituencies: Gatundu South, Gatundu North, Juja, Thika Town, Ruiru, Githunguri, Kiambu, Kiambaa, Kabete, Kikuyu, Limuru and Lari
Poverty level: 25 per cent (Kiambu District) and 48 per cent (Thika District)
Resources: Arable land, forests, water falls
Tourist attractions: Mau Mau Caves, Paradise Lost, Chania Falls and Fourteen Falls, Mugumo Gardens, Christina Wangare Gardens.
Main economic activities/industries: Farming, food processing, manufacturing (leather), mining (carbacid), textile (cotton), motor vehicle assembly, wholesale and retail trade.
Agricultural products: Pineapples, tea, coffee, wheat, macadamia nuts, poultry, horticulture, dairy, fish.
Number of institutions (2007): Primary (1,135), Secondary (373)
Enrollment: Primary 291,765, Secondary 73,831
Tertiary: More than 15
Health facilities: Four District Hospitals, three sub-district hospitals, dispensaries (108), health centres (29), medical clinics (170), nursing homes (nine), maternity homes (one), others (22)
Notable hospitals: Kiambu District Hospital, Thika District Hospital, Immaculate Heart of Mary Hospital, Kijabe Mission Hospital.