Thika District is a former administrative district in the Central Province of Kenya. Its capital town was Thika. The district was adjacent to the northeastern border of Nairobi. The district had a population of 645.713 [1].

In 2010, the district was eliminated and absorbed into Kiambu County.

The district was predominantly rural, but its urban population was soaring as Nairobi is growing rapidly. Kikuyu were the dominant tribe in the district.

Local authorities (councils)
Authority	Type	Population*	Urban pop.*
Thika	Municipality	88,265	82,665
Ruiru	Municipality	109,349	79,741
Thika county	County	448,099	5,968
Total	-	645,713	168,374
* 1999 census. Source: [2]

Administrative divisions
Division	Population*	Urban pop.*	Headquarters
Gatanga	103,048	0
Gatundu	113,699	0	Gatundu
Kakuzi	71,622	0
Kamwangi (Gatundu north)	99,460	0	Kamwangi
Ruiru (Juja)	150,710	81,709	Ruiru
Thika municipality	107,174	75,893	Thika
Total	645,713	157,602
* 1999 census. Sources: [3], [4],

The district had four constituencies:

• Gatanga Constituency (consisted of Gatanga and Kakuzi divisions)
• Gatundu South Constituency
• Gatundu North Constituency
• Juja Constituency (consisted Ruiru, Juja & Thika Town)

• Research findings – Thika District Archived 2007-03-11 at the Wayback Machine
• Gatanga Constituency Archived 2018-12-28 at the Wayback Machine

1°02′S 37°05′E / 1.033°S 37.083°E / -1.033; 37.083