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)

589,991

Registered voters (2022)

310,043

Voting-age by Aug 2027 (est.)

447,229

Gen-z eligible 2027 (est.)

187,426

41.9% of the 2027 voting-age est.

Gen-z (born 1997-2012)

187,426 eligible

≈ 129,934 of today's registered voters, if registration mirrors the age structure.

Youth (18-34 in 2027)

217,663

The bloc every 2027 campaign is chasing.

Millennials (born 1981-1996)

105,386

Peak-turnout generation in Vihiga.

Age structure · Vihiga

2019 census population by five-year band.

0-4

64,638

5-9

78,124

10-14

87,659

15-19

73,920

20-24

43,078

25-29

32,516

30-34

33,417

35-39

27,777

40-44

26,092

45-49

22,016

50-54

19,564

55-59

18,902

60-64

17,993

65-69

15,096

70-74

11,762

75-79

7,324

80-84

5,279

85-89

3,067

90-94

1,106

95-99

516

100+

145

Voters by constituency and ward · Vihiga

County age share (41.9%) 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.