Key Details
The study challenges the assumption that larger constituencies inevitably experience lower voter participation, suggesting that demographic composition and local social characteristics play a much larger role in shaping turnout.
Factor | Effect on Voter Turnout |
|---|---|
Constituency size effect weakened | The turnout gap between the smallest and largest Lok Sabha constituencies fell from 22.9 percentage points (2009) to 12.0 percentage points (2024). |
Scheduled Tribe turnout strengthened | The turnout premium associated with high-ST constituencies increased from +3.2 percentage points to +12.0 percentage points. |
SC turnout advantage disappeared | The turnout premium for SC-dominated constituencies declined from +7.6 percentage points to –0.7 percentage poin |
Urban turnout challenge emerged | Urbanisation shifted from a turnout advantage to a turnout constraint, with participation falling in highly urban constituencies. |
Women’s participation varies sharply by location | Urban women recorded significantly lower turnout than rural women, making them the lowest-participation demographic group identified in the study. |
Boundary restructuring could raise participation | The paper estimates that splitting 170 constituencies into 824 daughter constituencies could increase turnout by 0.3–2.3 percentage points, adding 9–23 million voters. |
Summary
Beyond the Constituency Size Debate
The Economic Advisory Council to the Prime Minister (EAC-PM) has released a working paper examining voter turnout patterns across 2,171 Lok Sabha constituency-elections between 2009 and 2024, ahead of the delimitation exercise expected after the next Census.
The paper challenges a long-standing assumption in electoral studies that larger constituencies inevitably experience lower voter turnout. Despite India’s parliamentary constituencies remaining among the largest in the world—with a median electorate of approximately 1.82 million voters—the turnout gap between the smallest and largest constituencies has narrowed substantially over the last fifteen years.
The analysis finds that state-level factors and election-year effects explain around 70 percent of turnout variation, while constituency composition explains a further share. The results suggest that demographic and social characteristics are often more influential than electorate size itself.
Changing Drivers of Voter Participation
Among the strongest findings is the growing turnout advantage in constituencies with larger Scheduled Tribe populations. The estimated turnout premium associated with high-ST constituencies increased from 3.2 percentage points in 2009 to 12.0 percentage points in 2024, with the highest-ST constituencies recording turnout levels approaching 73 percent.
In contrast, the historic turnout advantage associated with Scheduled Caste populations largely disappeared over the same period, declining from +7.6 percentage points to –0.7 percentage points.
The paper also identifies urbanisation as an emerging challenge for electoral participation. Constituencies with higher urban populations increasingly recorded weaker turnout outcomes, with the urban effect shifting from a modest positive contribution in 2009 to a negative one by 2024.
Gender and Linguistic Patterns
A notable finding concerns women’s participation. Urban women recorded turnout rates approximately five percentage points lower than rural women, compared with a smaller gap among men. According to the study, women residing in highly urban constituencies represent the lowest-turnout demographic segment, while women in rural, high-ST constituencies exhibit some of the strongest participation rates.
The analysis also highlights the role of language. Constituencies characterised by strong linguistic polarisation consistently recorded turnout boosts of approximately 11–13 percentage points, while the positive impact of linguistic diversity strengthened over successive election cycles.
Implications for Delimitation
To explore possible reforms, the paper models a scenario in which 170 existing Lok Sabha constituencies are divided into 824 daughter constituencies through a combination of two-way and three-way splits. Under the study’s assumptions, such restructuring could increase national turnout by between 0.3 and 2.3 percentage points, potentially bringing an additional 9 million to 23 million voters into the electoral process.
Policy Relevance
As India prepares for its first delimitation exercise in decades, the study suggests that constituency size alone provides an incomplete picture of electoral participation. Demographic composition, urbanisation, linguistic characteristics, and polling access may all influence turnout outcomes and therefore deserve consideration alongside population-based representation principles.
Protects Urban Public Representation from Severe Electoral Disenfranchisement Shocks: Utilizing a targeted boundary splitting plan to redraw 170 oversaturated seats ensures that fast-growing metropolitan centers receive extra legislative weight, preventing the under-representation of urban workers.
Incentivizes Targeted Voter Participation via Joint Demographic and Linguistic Profiling: Redrawing boundaries based on local ST, SC, and linguistic density structures creates highly homogeneous daughter constituencies, matching public voting blocks with clear regional governance needs.
Mitigates the Drastic Fall in Urban Female Voter Turnout through Focused Actions: Recognizing that urbanization depresses female turnout by 5 percentage points prompts the ECI to deploy women-only polling booths, evening voting hours, and free transit lines around city fringes to support women voters.
Optimizes the Allocation of Public Infrastructure Budgets for Polling Density: Co-timing the upcoming post-Census delimitation with a fresh booth rationalization cycle allows the government to build low-cost permanent polling facilities in high-growth zones, maximizing taxpayer value.
Mainstreams Data-Driven Accountability inside the Post-2027 Census Execution Pathways: Forcing the Delimitation Commission to replace simple headcount metrics with advanced generalized additive modeling ensures that the next multi-decade seat reallocation is completely insulated from political bias, supporting India's long-term democratic stability.
Follow the Full Paper Here: Constituency Size, Composition and the Case for Delimitation in India’s Lok Sabha (2009–2024)