Timeline
2025
119th Congress
Republican (both seats)
Democrat (both seats)
Split (one each)
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Statistics
⬆ Most People per Senate Seat
* Hypothetical value: territory/district total population ÷ 2, as if it had 2 Senate seats. Shown for comparison only — these places have no Senate representation.
Party data:
U.S. Senate Party Division (senate.gov) (opens in new tab)
·
Party Divisions of U.S. Congresses (Wikipedia) (opens in new tab)
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Voteview Historical Member Data (UCLA) (opens in new tab)
Population: U.S. Decennial Censuses 1900–2020 (census.gov) (opens in new tab) · Census Bureau State Population Estimates 2020–2023 (opens in new tab) · State Population 1900–2000 (Demographia) (opens in new tab) · Territory & D.C. Population (Census Bureau) (opens in new tab)
Map shapes: us-atlas TopoJSON (U.S. Census Bureau cartographic boundaries) (opens in new tab) · states-albers-10m.json (jsDelivr CDN) (opens in new tab)
People per seat = state population ÷ 2 · Independents caucusing with Democrats counted as Democrat-aligned · Pre-1913: senators chosen by state legislatures
Population: U.S. Decennial Censuses 1900–2020 (census.gov) (opens in new tab) · Census Bureau State Population Estimates 2020–2023 (opens in new tab) · State Population 1900–2000 (Demographia) (opens in new tab) · Territory & D.C. Population (Census Bureau) (opens in new tab)
Map shapes: us-atlas TopoJSON (U.S. Census Bureau cartographic boundaries) (opens in new tab) · states-albers-10m.json (jsDelivr CDN) (opens in new tab)
People per seat = state population ÷ 2 · Independents caucusing with Democrats counted as Democrat-aligned · Pre-1913: senators chosen by state legislatures