The highly contested race was between Wakapee's wife who was running on a Jubilee party ticket with Koimburi who was running on a PEP party ticket.
The kiambu county has been seen as a plot to show how strong the president Uhuru kenyatta can defend a seat through Jubilee party ticket.
The results were announced on Wednesday evening after all the 184 polling centres reported their respective outcomes.
Kariuki Joseph Gichui, an independent candidate, came third with 1,356 votes.
Mr Koimburi's victory follows an election day marked by poor turnout, bribery claims and an evening of chaos that led to suspension of vote tallying.
The winner, George Koimburi, was fronted by among other leaders, Gatundu South Member of Parliament Moses Kuria.
The president Uhuru kenyatta losing ground in Central kenya, with a majority of residents rejecting the contentious BBI report that has caused a huge division in the area.
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