Users' groups began to proliferate with the microcomputer revolution of the late 1970s and early 1980s as hobbyists united to help each other with programming and configuration and use of hardware and software.

Participation dropped off with the emergence of the World Wide Web, where people could share with a larger body of users.

Some of the more well known groups are:

• SHARE, a user group originated by aerospace industry corporate users of IBM mainframe computers, was founded in 1955 and is the oldest computer user group still active.
  
• 1975 Homebrew Computer Club Menlo Park.
  Steve Wozniak credits that first meeting as the inspiration to design the Apple I.
• BNUG - The Boston Network Users Group founded in 1986
  BMUG - Berkeley Macintosh Users Group - Wikipedia

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• ACGNJ - The Amateur Computer Group of New Jersey Established in 1977 by Sol Libes at Union County College, the Amateur Computer Group of New Jersey (ACGNJ) is the oldest continuously running computer club in the United States.
  

• New York Mac User group which met at CUNY on 42nd st.
  At a demo of the Musical Instrument Digital Interface (MIDI) on the Mac in about 1986 a well known Broadway arranger demonstrated recording and playing a popular Broadway tune on a Mac Plus connected to $ thousands of audio equipment.
  He got a standing ovation from a packed crowd in the main auditorium. Apple was sued for $ millions by Apple records for a trademark violation. They had made a big settlement with Apple Record years earlier under the condition that they stay out of the music business. Oops! Apple is now in the music business.

• PMUG - The Princeton Macintosh Users' Group — Still Active

• MACNJ - Macintosh Association of Central New Jersey
  

• BMUG
  Rather than publish a standard monthly newsletter, the group decided to publish a collection of articles in a bound book every six months. The resulting "newsletter" routinely exceeded 300 pages in length. It was the bible for new Mac hardware and software for years.
  Reese Jones, a CAL student was one of the BMUG founders. He created the Local Talk networking interface which worked over twisted pair (telephone wire) instead of Ethernet. He created Farallon corp. to market it. I have a long story about working with the research organization to install thousands of farallon adapters which kept Bell Labs from banning Macs. The people in the computer center didn't want to allow "home computers" on a corporate network. The research area of Bell Labs quickly became a Mac organization. Computer User Groups in USA
  
• MacNexus - A Macintosh user group in Sacramento with about 300 members as of 2025.
  It has workshops and tutorials.
  Started in 1984 it still gets 150+ members on Zoom.
• Washington Apple Pi's Apple User Group Listing