Which town has been in the most stamp-issuing countries?

How about Corfu Town (on the Island of Corfu)

1. United States of the Ionian Islands, British Protectorate (1810-1864)
2. Kingdom of Greece (1864-1924)
3. Occupation by Italy, during the Corfu Incident (1923)
     Back to the Kingdom of Greece
4. Second Republic of Greece (1924-1935)
5. Restored Kingdom of Greece (1935-1941)
6. Italian Occupation during WW2 (1941-1943)
7. German Occupation during WW2 (1943-1944)
8. Allied Liberation/Occupation (1944-1945)
9. Greek Civil War (1946-1949)
10. Kingdom of Greece restored (1949-1967)

11. Military Coop and Dictatorship of George Papadopoulos (1967-1973)

12. Military coup by General Dimitrios Ioannides ousts Papadopoulos (1973)

13. Coop regimen ends and Third Republic of Greece is established (1974 to now)

Lots of major changes in government in Greece, so might be pushing your definition of major government changes.

Michael

Or how about:

Wenden (Cēsis), Livonia (Latvia),

Wenden was an administrative county of greater Livonia, a Baltic Governorate of Imperial Russia, from about 1712 to 1918. Today, Wenden is know as Cēsis in Latvia.

1.  Russian Empire (1721-1914)

2.  Wenden - issued its own postage stamps  (1862-1901)

     Russian Empire (till 1914)

3.  German Occupation of Latvia - Latvia was part of the Ob Ost area which included the Baltics and part of Belarus (1914-1918)

4.  Soviet Occupation of Latvia - Bolsheviks taking advantage of German retreats, invaded and occupied Latvia (1918-1920)

5.  West Russian Army of General Bermondt-Avalov Occupation - This Anti Bolshevik army occupied much of Latvia to fight off the Red army.  (1919)

6.  Republic of Latvia  - per international treaty, Latvia became and independent country (1920-1940)

7.  Soviets attacked and occupied Latvia - along with other Baltic nations from a secret agreement with the Nazis (1940-1941)

8.  German  Occupation in WW2 - the Nazis turned on Russia,attacked and occupied Latvia and made it a part of Ostland (1941-1944)

9.  Soviet Occupation of Latvia - Soviet forces eventually drove out the Germans from the Baltics (1944-1945)

10. Latvian SSSR. Latvia became part of the Soviet Union. (1945-1990)

11. Republic of Latvia - Latvia gained independence after the collapse of the Soviet Union.

Although I haven't organized them, here are some of my stamps from Wenden, when they issued stamps during the Russian Empire  (Russia, Scott #'s L1, L8, L9, L10 and L12)

Michael