Senate, House of Reps and House of Assembly

Nigeria elects its legislators from three kinds of area, all delimited by INEC:

Seat	Area	How many	naija-data code
Senator	Senatorial district	109 (3 per state, 1 for the FCT)	SD001–SD109
Member, House of Representatives	Federal constituency	360	FC001–FC360
Member, State House of Assembly	State constituency	990 (none in the FCT)	SC001–SC990

Every one of the 8,809 wards knows its senatorial district, federal constituency and state constituency, so you can answer “who represents this place?” from a ward or an LGA.

Who represents an LGA or ward?

JavaScript

import { lgaConstituencies, getConstituency } from "naija-data/constituencies";
import { getWard } from "naija-data/wards";

lgaConstituencies("Ikeja", "Lagos").map((u) => `${u.kind}: ${u.name}`);
// ["senatorial_district: Lagos West", "federal_constituency: Ikeja",
//  "state_constituency: Ikeja I", "state_constituency: Ikeja II"]

const ward = getWard("24-11-01")!;
getConstituency(ward.state_constituency!)?.name; // the ward's exact state constituency

Python

import naija_data as ng

[(u.kind, u.name) for u in ng.lga_constituencies("Ikeja", "Lagos")]
# [('senatorial_district', 'Lagos West'), ('federal_constituency', 'Ikeja'),
#  ('state_constituency', 'Ikeja I'), ('state_constituency', 'Ikeja II')]

ward = ng.get_ward("24-11-01")
ng.get_constituency(ward.state_constituency).name

Go

units, _ := naija.LGAConstituencies("Ikeja", "Lagos")
for _, u := range units {
  fmt.Println(u.Kind, u.Name)
}

REST API

curl "https://naija-data-api.asgatcreation.workers.dev/v1/lgas/Ikeja/constituencies?state=Lagos"
curl https://naija-data-api.asgatcreation.workers.dev/v1/wards/24-11-01

An LGA can be in more than one constituency

Ikeja LGA is split between two state constituencies (Ikeja I and Ikeja II), and a few LGAs such as Surulere (Lagos) are split between two federal constituencies. When you need the exact one, ask by ward: a ward is never split.

Lists and dropdowns

JavaScript

import {
  senatorialDistricts, federalConstituencies, stateConstituencies, constituencyLgas,
} from "naija-data/constituencies";
import { constituencyWards } from "naija-data/wards";

senatorialDistricts("Kano").map((u) => u.name);    // ["Kano Central", "Kano North", "Kano South"]
federalConstituencies("Lagos").length;             // 24
stateConstituencies("FCT");                        // []: the FCT has no House of Assembly
constituencyLgas("FC236").map((l) => l.name);      // ["Ikeja"]
constituencyWards("FC236").length;                 // wards that make up Ikeja federal constituency

Python

[u.name for u in ng.senatorial_districts("Kano")]  # ['Kano Central', 'Kano North', 'Kano South']
len(ng.federal_constituencies("Lagos"))             # 24
ng.state_constituencies("FCT")                      # []
[l.name for l in ng.constituency_lgas("FC236")]     # ['Ikeja']
len(ng.constituency_wards("FC236"))

REST API

curl "https://naija-data-api.asgatcreation.workers.dev/v1/senatorial-districts?state=kano"
curl "https://naija-data-api.asgatcreation.workers.dev/v1/federal-constituencies?state=lagos"
curl https://naija-data-api.asgatcreation.workers.dev/v1/constituencies/FC236/lgas
curl https://naija-data-api.asgatcreation.workers.dev/v1/constituencies/FC236/wards

Each record looks like this (the same in every language):

{
  "kind": "federal_constituency",
  "code": "FC236",
  "state_code": "LA",
  "inec_code": "FC/236/LA",
  "name": "Ikeja",
  "slug": "ikeja",
  "aliases": [],
  "lga_codes": ["NG025011"],
  "sources": ["inec-irev"]
}

get_constituency / getConstituency accepts our code (FC236) or INEC’s (FC/236/LA).

Good to know

• Source. INEC’s Result Viewing portal (IReV): unit names from the 2023 general elections, and the ward links of the 2023 presidential election.
• 990, not 993. INEC’s own list has 990 state constituencies. The figure of 993 often quoted in the press is not in INEC’s data.
• A few links are flagged. 14 wards look mislinked in INEC’s data (a same-named ward in a neighbouring LGA). INEC’s value is kept, and the ward’s unverified_fields contains state_constituency. Details in coverage and gaps.
• Boundaries can change. INEC can review constituencies; naija-data will follow with a new release.