The party in my current Wilderlands C&C PBEM currently comprises 6 PCs (Assn 4, 2 Ftr 1, Rgr 1, Wiz 1, Rog 1), and 6 level 0 Tharbrian slave girls they're escorting to freedom (hopefully).
The party in my current Moldvay B/X D&D PBEM currently comprises 3 PCs (F5, M-U 4, F4), 1 cohort/2ndary PC (C4), and 3 NPCs (C3, T4, T7).
Edit: The party in my tabletop game (3.5e, restarting as C&C) is normally 4 PCs (Clr 8, Wiz 8, Rgr 9, Swashbuckler 10) with maybe 1 NPC cohort.
The party in the 3.5e tabletop game I'm playing in is 4 PCs (Ftr 5, Rgr 5, Wiz 4/Rog 1, Clr 5), with 1 NPC.