How many constituent republics made up the Soviet Union at the time of its dissolution?

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15 republics. The Soviet Union was made up of 15 constituent republics when it dissolved in December 1991, from the Russian SFSR to the three Baltic states and the Central Asian republics. All 15 became independent countries at once, in one of the largest single redrawings of the world map since the end of European colonial empires. Count the successor states. Every constituent republic became an independent country at dissolution, so the answer equals the number of countries that appeared in 1991 — Russia, Ukraine, Belarus, the three Baltic states, the Caucasus three and the five Central Asian republics. Counting the successors by region is more reliable than recalling the total. The simultaneity is what makes this historically remarkable. All fifteen became independent essentially at once, which is one of the largest single redrawings of the world map since the end of the European colonial empires. Most state dissolutions happen over years; this one happened in a December. The figure also connects directly to the disappeared-countries question on this site: a single dissolution producing fifteen new states is why the count of vanished sovereign entities grows faster than intuition suggests. One country leaving the map created fourteen more than it removed.

Source	U.S. Office of the Historian, Department of State
Figure refers to	2023
Last checked	September 2, 2026
Unit	republics

How many constituent republics made up the Soviet Union at the time of its dissolution?

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