There isn’t one single fixed number for “NPC citizens” in Half-Life 2, because the game uses citizen NPCs in many maps and with several different citizen models and roles. What people usually mean is the citizen types/models : one source notes nine male models and six female models, for 15 core citizen model variants.

What that means in practice

  • Citizen models: 15 total core variants, based on the model count above.
  • Citizen NPC entity: Valve’s developer wiki describes npc_citizen as the citizen NPC used throughout Half-Life 2, but it does not give a single total headcount for all citizens placed in the game.
  • Actual in-game citizens: the number changes by chapter, map, and whether you count scripted appearances, so there is no official all-game “citizen total.”

Quick scoop

If you meant how many citizen model types exist , the best-supported answer is 15. If you meant how many individual citizen NPCs appear in the whole game , there isn’t an official published total.

TL;DR: 15 citizen model variants , but no official total count of individual citizen NPCs across the entire game.