Principal Officers and Chiefs of Mission, by year: 1818
Note: Career Foreign Service appointees are asterisked.
- Adams, John Quincy (1767-1848)
- Minister Resident, Netherlands (1794-1797)
- Minister Plenipotentiary, Portugal (1796)
- Minister Plenipotentiary, Germany (1797-1801)
- Minister Plenipotentiary, Russia (1809-1814)
- Envoy Extraordinary and Minister Plenipotentiary, United Kingdom (1815-1817)
- Secretary of State (1817-1825)
- Brent, Daniel Carroll (1770-1841)
- Secretary of State ad interim (1825)
- Chief Clerk (1817-1833)
- Campbell, George Washington (1769-1848)
- Envoy Extraordinary and Minister Plenipotentiary, Russia (1818-1820)
- Erving, George William (1769-1850)
- Minister Plenipotentiary, Spain (1814-1819)
- Chargé d'Affaires, Turkey (Not commissioned, although his nomination was confirmed by the Senate.)
- Eustis, William (1753-1825)
- Envoy Extraordinary and Minister Plenipotentiary, Netherlands (1814-1818)
- Everett, Alexander Hill (1790-1847)
- Chargé d'Affaires, Netherlands (1818-1824)
- Envoy Extraordinary and Minister Plenipotentiary, Spain (1825-1829)
- Commissioner, China (1845-1847)
- Gallatin, Albert (1761-1849)
- Envoy Extraordinary and Minister Plenipotentiary, France (1815-1823)
- Envoy Extraordinary and Minister Plenipotentiary, United Kingdom (1826-1827)
- Pinkney, William (1764-1822)
- Minister Plenipotentiary, United Kingdom (1808-1811)
- Envoy Extraordinary and Minister Plenipotentiary, Russia (1816-1818)
- Rush, Richard (1780-1859)
- Envoy Extraordinary and Minister Plenipotentiary, United Kingdom (1818-1825)
- Secretary of State ad interim (1817)
- Envoy Extraordinary and Minister Plenipotentiary, France (1847)
- Russell, Jonathan (1771-1832)
- Chargé d'Affaires, France (1810-1811)
- Minister Plenipotentiary, Sweden (1814-1818)
- Chargé d'Affaires, United Kingdom (1811)
- Sumter, Thomas (1768-1840)
- Minister Plenipotentiary, Portugal (1809-1819)