What is the best level to find iron in 1.20?

As of version 1.20 of Minecraft, the best level to find iron is still around an elevation of 5 to 64 blocks. Iron ore generates most commonly in veins of 1-9 blocks in the Overworld. It can also be found in large ore veins of up to 66 blocks in Sunflower Plains and Modified Jungle Edge biomes.

To efficiently mine for iron, players can strip mine at a Y-level of 11-12 or use the technique known as "branch mining" at slightly higher levels to cover more ground. It is recommended to use an iron or better tier pickaxe to mine iron ore and collect it as it yields iron ingots, which can be smelted in a furnace to craft various tools and armor.

Overall, players can find iron ore in abundance throughout their mining expeditions at the optimal levels in version 1.20 of the game.