Below are various lists of microprocessors:

by architecture sizes

1-bit - 4-bit - 8-bit - 12-bit - 16-bit - 18-bit - 24-bit - 26-bit - 31-bit - 32-bit - 36-bit - 48-bit - 60-bit - 64-bit - 128-bit - 256-bit - 512-bit

by lithography processes

10μm - 8μm - 6μm - 5μm - 3.5μm - 3μm - 2μm - 1.5μm - 1μm - 0.8μm - 0.6μm - 0.5μm - 0.35μm - 0.25μm - 0.22μm - 350nm - 250nm - 220nm - 180nm - 150nm - 130nm - 110nm - 90nm - 80nm - 65nm - 45nm - 40nm - 32nm - 28nm - 22nm - 14nm - 10nm - 7nm - 5nm