I play in one group, which is five steady people plus a three or so based on campaign, with usually one joining us for a campaign.
I play in another group, which is a group I started 20+ years ago. The active membership has changed over the years, with six current and about ten more who are part of that circle but not part of the current campaign.
I run one game, with four people from the first group and one of the ones that's not an active part of the second group.
I run another game, with four regulars and one occasional, unrelated to any other group. These are my kids, niece and nephew, with other nephew who's in college being the occasional one.
I've recently started an online West Marches campaign with several other DMs, and we've brought in gamers we knew (including from those first two groups) plus another circle that's somewhere between four and eight.
I have significant (20+ easily) other gamers that I've gamed with in the past but the groups aren't together now, whom I'm still in at least "facebook chatting" levels of contact with.