Read more: New Delimitation Bill 2026: What it means and its key proposals
This shift was not driven by one region gaining over the other. Instead, it reflected the increasing representation of Union Territories and the rising share of seats allocated to western and eastern states. The comparison also needs to be viewed in context: India’s political map in 1951 was markedly different, predating the linguistic reorganisation of states. By 1956, state boundaries had largely taken their current shape, though several Union Territories still had limited or no representation in the Lok Sabha at the time.
The 1951 election was held before the linguistic reorganisation of states, meaning state boundaries were very different from those seen today. After the 1956 reorganisation, states largely took their present shape, although several Union Territories continued to have little or no representation in the Lok Sabha.
The decline in regional share was driven in part by the growing representation of Union Territories, as well as increasing seat shares for western and eastern states. Even by 1977 — the last election included in this analysis, since Lok Sabha seats have not been reallocated since then — Daman & Diu had not yet been carved out as a separate Union Territory.
It is also important to note that this comparison tracks the share of total Lok Sabha seats, rather than measures such as voter population per Member of Parliament or constituency size. Additionally, for 1951 and 1957, the figures refer to seats and not constituencies, as some constituencies elected two members during that period.
