Method
Sources
| What | Source | Used for |
|---|---|---|
| Removals by polling booth | The phase 1 deletion lists published by the Chief Electoral Officer, Bihar with the draft roll of 1 August 2025, counted for each of the state's polling booths | 77,837 booths, 65,59,626 names |
| Removals by constituency, phase and sex | Chief Electoral Officer, Bihar, both phases | Totals, phase 2, women and men |
| Reason for each removal | The reason the officer gave for every name on the phase 1 lists (dead, permanently shifted, absent, already enrolled), counted by constituency, booth, sex and age. Counts only, with no individual records | Reasons for removal, by sex, age, district and seat |
| The final roll, by constituency and sex | Format 4B, the Election Commission's return for the final roll of 30 September 2025, as published by the Chief Electoral Officer, Bihar. It gives the draft roll, the claims and objections admitted, the reason for each removal after the draft, and the final roll | Women's share of the roll before the revision (the draft roll by sex plus the phase 1 removals by sex), additions and removals after the draft, and the fall at the final roll |
| Religion of the removed, by booth | Each removed elector's name classified as Hindu, Muslim or unclassified, counted by booth and sex | Muslim share of removals, as a range |
| Surnames of the removed | Counts of each surname among the removed, for the elector and for the father or husband listed with them. Counts only, with no individual records | Caste, under two classifications |
| 2024 Lok Sabha result by booth | Form 20, the booth-level count, top three parties in each booth | The party that led each booth |
| 2020 and 2025 Assembly results, 2025 electorate | Election Commission of India, declared results | Seat labels, margins, removals per 100 electors |
| Deaths | Sample Registration System, Statistical Report 2024, for death rates by age and sex (Table 8) and the population by age (Table 1). Civil Registration System 2024, for the mid-year population and registered deaths by age and sex | Adult deaths a year, set against the names entered as dead |
| Marriage migration by district | Census of India 2011, migration table D-3: women who had moved on marriage, by district of arrival and years since the move | Young women marked shifted, set against marriage movement |
| Population by district and religion | Census of India 2011, the latest count by religion at district level, and Census of India 2001, table C-01, used to carry each district's 2011 share forward to 2025 at its 2001-2011 growth rates | Baseline for religion |
| Women's literacy and marriage by district | National Family Health Survey (NFHS-5), district fact sheets for Bihar, fielded in 2019-20: women aged 15 to 49 who are literate, and women aged 20 to 24 married before 18 | District characteristics |
| Urban share and density by district | Census of India 2011, the last count at district level | District characteristics |
| Caste composition | Bihar caste-based survey, released 2 October 2023 | Baseline for caste |
All figures are aggregates. No name, EPIC number or address appears anywhere on these pages.
How the lists were prepared
One count per booth
The booth list repeats each booth once for each of its three leading parties in 2024, with the same removal count on every row. Counting each booth once gives 77,837 booths and 65,59,626 phase 1 removals, the Chief Electoral Officer's total.
Party names matched to the declared result
Votes added up from the booths match the declared 2024 result in every Lok Sabha seat. In nine seats a column of votes carried a party name that differed from the declared result. Those columns were matched to the declared result, and the evidence for each is below. After matching, the first and second parties in all 40 seats are the declared winner and runner-up.
Titles are not surnames
Most women carry Devi, Kumari or Khatun in place of a surname, and none of the three says anything about caste. They are set aside, and caste is read first from the surname of the father or husband.
Reasons are read as entered
Each name on the phase 1 lists has the reason the officer gave for removing it. The four reasons are counted as written and none is regrouped. The counts agree with the booth list in all 77,837 booths, and the counts of women and men agree with the Chief Electoral Officer's phase 1 figures in every constituency. The phase 2 lists give no reasons.
Constituencies are joined by number
Bihar has two seats called Kalyanpur (16 and 131) and two called Pipra (17 and 42), so every match between tables uses the constituency number. Minapur (90) belongs to the Vaishali Lok Sabha seat.
Border constituencies
A constituency counts as a border constituency when its district touches Nepal, West Bengal, Jharkhand or Uttar Pradesh.
The 2024 result, seat by seat
Vote shares summed from the booths, beside the declared figures.
Research questions
What this shows and what it does not
The lists show how many names were removed and from which booths, and the sex and name of each person removed, which is enough to set the removals against the margins that decided each seat. They also record the reason the officer gave for each phase 1 removal. They cannot show whether that reason was true, whether the removal was right, or how the elector voted. Religion and caste are guessed from names. Questions and answers.
Removed means named on the SIR deletion lists. Per 100 electors is removals across both phases divided by the constituency's 2025 electorate. The booth leader is the party with the most votes in the booth in 2024, and the segment leader the party with the most votes in the assembly segment in 2024.