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)

990,309

Registered voters (2022)

398,981

Voting-age by Aug 2027 (est.)

717,829

Gen-z eligible 2027 (est.)

324,957

45.3% of the 2027 voting-age est.

Gen-z (born 1997-2012)

324,957 eligible

≈ 180,616 of today's registered voters, if registration mirrors the age structure.

Youth (18-34 in 2027)

386,180

The bloc every 2027 campaign is chasing.

Millennials (born 1981-1996)

204,379

Peak-turnout generation in Trans Nzoia.

Age structure · Trans Nzoia

2019 census population by five-year band.

0-4

129,558

5-9

142,922

10-14

149,348

15-19

124,544

20-24

85,108

25-29

67,949

30-34

64,540

35-39

47,308

40-44

44,070

45-49

33,676

50-54

25,936

55-59

23,095

60-64

17,889

65-69

12,677

70-74

9,149

75-79

5,407

80-84

3,500

85-89

2,204

90-94

776

95-99

497

100+

156

Voters by constituency and ward · Trans Nzoia

County age share (45.3%) applied to each seat's 2022 registered voters, an estimate, since sub-county age data isn't published.

Loading map…

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.