Timeline
2025
119th Congress
Republican (both seats)
Democrat (both seats)
Split (one each)
Third party / mixed
Vacant
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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)
·
Voteview Congressional Member Data 1789–present (UCLA) — basis of the 1789–1899 frames (opens in new tab)
Population: U.S. Decennial Censuses 1790–2020 (census.gov) (opens in new tab) · Census Bureau State Population Estimates 2020–2023 (opens in new tab) · Population of States & Counties 1790–1990 (census.gov PDF) (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 ÷ senators actually seated (usually 2; † = only one seat filled) · Independents caucusing with Democrats counted as Democrat-aligned · Pre-1913: senators chosen by state legislatures · Delaware’s seats sat vacant 1901–03 (Addicks deadlock)
© 2026 My Visual Gov · This work is licensed under CC BY-NC 4.0 (opens in new tab) — free to share and adapt with credit, not for commercial use
Population: U.S. Decennial Censuses 1790–2020 (census.gov) (opens in new tab) · Census Bureau State Population Estimates 2020–2023 (opens in new tab) · Population of States & Counties 1790–1990 (census.gov PDF) (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 ÷ senators actually seated (usually 2; † = only one seat filled) · Independents caucusing with Democrats counted as Democrat-aligned · Pre-1913: senators chosen by state legislatures · Delaware’s seats sat vacant 1901–03 (Addicks deadlock)
© 2026 My Visual Gov · This work is licensed under CC BY-NC 4.0 (opens in new tab) — free to share and adapt with credit, not for commercial use