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1. Impassable areas No unit may enter Switzerland or the Himalayas. The body of water in the center of the map is the Caspian Sea and is intentionally left unlabeled and cannot be entered. No unit may enter the zone marked "Impassable" north of Russia.

2. Coastal Icebreaker Fleets may move along the coast of Omsk (icebreakers did exist in those days).

3. Off-board areas Surrounding the edge of the map are "off-board" boxes. The boxes are referred to as follows. The box in the North Atlantic is known as "Offboard A", the box in the Mid-Atlantic as "Offboard B", etc., counterclockwise to "Offboard L", in the North Pacific. Movement into and out of off-board boxes is covered by the following rules:
   1. Any unit in an area that contains an off-board box may move into that box as though moving to a normal sea area or province. Any unit in an off-board box may move into the sea area or province that contains the off-board box.
           Example:
           English F NAt -> ObA
           Japan F ObK -> SPO
      Off-board box C is contained within the South Atlantic. This is indicated by an arrow since there is not enough room in that space for the box.
   2. A unit in an off-board box may move to any off-board box whose letter appears in the off-board box where the unit is located.
           Example:
           French F ObB -> ObC
           India F ObH -> ObG
      
   3. Off-board boxes are treated as normal sea areas or provinces. Hence, only one unit may be present in an off-board box.
   4. Support orders and convoy orders apply to off-board boxes.
           Example:
           Japan
           F NPa C A Tok -> Ire
           F ObL C A Tok -> Ire
           F ObA C A Tok -> Ire
           F NAt C A Tok -> Ire
           A Tok -> NPa -> ObL -> ObA -> NAt -> Ire
           England
           F ObB -> ObK
           F ObJ S F ObB -> ObK
   5. Fleets may move to any off-board box with the exception of the inland African boxes (boxes E and F, located in Sudan and the Sahara). A fleet in either of the other African off-board boxes (boxes D and G, located in Morocco and East Africa) is considered to be on the coast of the African continent, and may not participate in convoys.
   6. Armies may move only to the four off-board boxes located in Africa (boxes D, E, F, and G), but may be convoyed by fleets through any of the other off-board boxes.

4. The Suez The Suez is a water space contained within Egypt that provides a route between the Red Sea and the Eastern Mediterranean. The Suez is adjacent to the Eastern Mediterranean, the Red Sea, and the north and east coasts of Egypt. It is not adjacent to either coast of Jordan. The Suez does not separate Egypt from Jordan or affect the adjacency between those two spaces. Jordan's north coast is adjacent to Egypt's north coast and Jordan's west coast is adjacent to Egypt's east coast. Units may move between Egypt and Jordan regardless of whether or not there is a fleet in the Suez and fleets may move into the Suez regardless of whether or not there is a unit present in Egypt. Fleets in the Suez may convoy armies.

Youngstown is named after the city in Ohio where the variant was created and first played. It is regarded by many as the oldest Diplomacy variant.

The Youngstown variant played on the DPjudge is named Youngstown IVa in the Variant Bank. This variant was created by Rod Walker, A. Phillips, Ken Lowe, and Jon Monsarret.