Voter Demographics

Who can vote in 2027, by generation and age band: 2019 census age structure projected to election day, joined with the IEBC 2022 register.

Scope

Population (2019)

2,417,552

Registered voters (2022)

1,275,008

Voting-age by Aug 2027 (est.)

1,897,611

Gen-z eligible 2027 (est.)

600,107

31.6% of the 2027 voting-age est.

Gen-z (born 1997-2012)

600,107 eligible

≈ 403,213 of today's registered voters, if registration mirrors the age structure.

Youth (18-34 in 2027)

808,928

The bloc every 2027 campaign is chasing.

Millennials (born 1981-1996)

735,857

Peak-turnout generation in Kiambu.

Age structure · Kiambu

2019 census population by five-year band.

0-4

278,141

5-9

241,800

10-14

227,330

15-19

211,921

20-24

268,093

25-29

253,961

30-34

229,596

35-39

181,328

40-44

143,053

45-49

112,600

50-54

82,716

55-59

61,991

60-64

38,985

65-69

29,975

70-74

23,596

75-79

13,520

80-84

8,989

85-89

5,411

90-94

2,410

95-99

1,478

100+

658

Voters by constituency and ward · Kiambu

County age share (31.6%) applied to each seat's 2022 registered voters, an estimate, since sub-county age data isn't published.

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Estimated 2027 voting-age population by ward (county age share × 2022 register). Darker = more voting-age residents.

Methodology & sources

Age structure: KNBS 2019 Census (via OCHA COD-PS, data.humdata.org/dataset/cod-ps-ken), from the 2019 census county tables (KNBS via OCHA).
Registered voters: IEBC 2022 General Election register (per ward), the same figures behind every seat page here.
2027 projections age the census cohorts forward to August 2027 (whoever was N years old in 2019 is N+8), ignoring mortality and migration; treat them as estimates.
Gen-z = born 1997-2012; those born by August 2009 are eligible in 2027. Constituency and ward figures apply the county's age share to the seat's registered voters.
These are eligibility and registration figures, never turnout predictions.