453.6 million Indians — 38 out of every 100 people — are internal migrants.
But only a fraction move for the reason most people assume. Marriage, not employment, is India's single largest driver of migration — and the two reasons split almost entirely along gender lines.
Why Indians actually migrate
Census 2011 recorded seven official reasons for migration, covering all 453,641,955 internal migrants. Work and employment — the reason at the center of this story — is only the fourth largest.
Of everyone who migrated for marriage (223,882,710 people), 97% are women (Census 2011). Looked at the other way, about 2 in every 3 female migrants cite marriage as their reason for moving — marriage is the dominant channel through which Indian women become migrants.
Of the 46,383,766 people who migrated for work or employment, roughly 84% are men — work-driven migration in India is a heavily male channel.
223,882,710 Indians (49.36%) migrate for marriage, where roughly 2 of every 3 women who migrate do so for marriage — while work migration runs 84% male (of 46.4 million). Women's mobility is still largely governed by family and marriage decisions; men's mobility is governed by the labor market.
Where labor migrants come from — and go
Interstate migration in India is concentrated in a small number of states, on both ends of the journey.
Bihar and Uttar Pradesh alone send 20.9 million migrants — 37% of all interstate migration nationally — toward states offering work. Add Rajasthan and Madhya Pradesh, and four states account for half of all interstate migrants in India.
Migration follows poverty
NITI Aayog's Multidimensional Poverty Index shows the states people leave are, overwhelmingly, the states with the highest poverty.
Poverty and a lack of local livelihood options (the "push") combine with the promise of urban wages (the "pull") — even when, as later sections show, that promise is only partially fulfilled by informal work. Bihar's 51.91% poverty rate vs. Delhi's 4.79% is not a coincidence — it is the gradient migration flows down.
The myth of the "city migrant"
The image of villagers streaming into megacities is only a small part of the real pattern.
Only 20% of migration is rural-to-urban; 62% is rural-to-rural. This complicates a simple Lewis-model story of surplus agrarian labor flowing directly into urban industry — much of India's labor absorption is still happening within the rural, agrarian economy, not by shifting it into cities.
On the ground: Delhi's urban periphery
To see this pattern up close, we pulled real Census 2011 data for 15 census towns in Delhi's District 090 — areas that absorb large numbers of interstate migrant workers.
In Delhi's periphery, work migrants are 93.4% male vs. 6.6% female (1,463,631 vs. 104,163) — sharper than the national 84/16 split. This points to real barriers — safety, childcare, social norms, lack of independent housing — that keep women out of independent labor migration specifically.
Explore all 15 towns
Interstate migrants only (last residence in a different state), all reason categories, Census 2011. "DMC (U) (Part)" is a much larger aggregated municipal zone, not a single town — its numbers are correctly far bigger than the other 14.
The cost: informality and who bears it
Migrant workers who move for employment typically enter informal, unprotected work — jobs without written contracts, social security, or legal recourse. This is not incidental to Indian labor migration; it is close to the default.
The Lewis dual-sector model describes surplus rural labor being absorbed into low-productivity urban informal work rather than formal industrial employment — consistent with the low female participation and high informality this story's numbers point to.
The Harris-Todaro model goes further: it explains why people keep migrating even when urban unemployment is visibly high — because migrants weigh the expected urban wage (formal-sector wage x probability of getting a formal job) against guaranteed but lower rural income, and the informal sector offers a fallback while they wait.
Because labor migration is overwhelmingly male, the women who do migrate for work face compounded vulnerability — they are a small minority within an already-informal, already-unprotected population, often without the safety-in-numbers that male migrant networks provide.
Despite the risks, 46.4 million people still migrate for work nationally — betting on urban wages over guaranteed local employment, exactly the calculus the Harris-Todaro model predicts.
Policy responses
Two recent government initiatives directly target the gaps this data exposes — informality and lack of portability.
e-Shram Portal
A national database for informal/unorganised sector workers — the first attempt to formally register and identify India's vast, largely invisible informal workforce, including migrant laborers.
One Nation One Ration Card
Allows food-subsidy entitlements to move with a migrant across state lines — addressing the fact that welfare benefits in India have historically been tied to a single state of residence.
Key findings, in numbers
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1
Marriage accounts for 49.36% (223,882,710) of all Indian migration, outnumbering work/employment migration (10.23%, or 46,383,766) by nearly five to one.
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2
Work migration is overwhelmingly male-dominated, shifting from an 84% male / 16% female split nationally to an even sharper 93.4% male (1,463,631) vs. 6.6% female (104,163) divide in Delhi's urban periphery.
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3
Two states — Uttar Pradesh and Bihar — generate 20.9 million out-migrants, representing 37% of all interstate migrants nationally, rising to 50% when combined with Rajasthan and Madhya Pradesh.
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4
Multidimensional poverty separates origin and destination regions by a 47.12 percentage-point gulf, led by sending-state Bihar at 51.91% poverty compared to receiving-hub Delhi at 4.79%.
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5
Village-to-village migration dominates India's demographic movement at 62% (rural-to-rural), while the conventional rural-to-urban "city migration" narrative represents only ~20% of all migration streams.