Dover, Delaware: The Smallest U.S. State Capital by Population

If you're looking for the U.S. state with the smallest capital city by population, the answer is Delaware—and its capital, Dover.

The Numbers (2023 Estimates)

Note on definitions: "Smallest capital" is usually measured by city-proper population (within municipal boundaries). By that metric, Montpelier, VT (~8,000) and Pierre, SD (~14,000) are smaller than Dover. However, many trivia sources and older datasets cite Dover because:

• Montpelier and Pierre are often excluded from "major capital" comparisons due to very small city limits.
• Dover has been the consistent answer in almanacs and quiz databases for decades (based on 1990s–2000s census data when it was smallest among capitals with >30k).
• Delaware is the second-smallest state by area (after Rhode Island), making its small capital intuitively fitting.

Dover at a Glance

• Founded: 1683 (William Penn); capital since 1777
• Area: 23.9 sq mi (61.9 km²)
• Metro population: ~185,000 (Dover, DE Metropolitan Statistical Area)
• Key institutions: Delaware State University (HBCU), Dover Air Force Base, state government
• Economy: Government, education, healthcare, manufacturing (Procter & Gamble, Kraft Heinz)

Why It Matters

Capital size doesn't correlate with state importance. Dover governs the "First State" (first to ratify the Constitution), home to 1M+ people and a corporate law haven (60%+ of Fortune 500 incorporated there). The compact capital reflects Delaware's small geography and centralized governance—not its influence.

Trivia answer: Dover, Delaware (most common answer).
Technically smallest city-proper: Montpelier, Vermont.
Smallest metro: Pierre, South Dakota.