Check this with your county 4-H agent. This depends on their need for money. There are no state or national 4-H dues. If a club wants money for some activities, it usually charges dues or conducts money-making activities. Any place large enough that is convenient for the members of the group.
Some clubs meet in leaders or members homes or garages.
Some meet in a central place such as a school, church, or community room. This depends on the age of members, the places they have to meet, and the leadership available. The ideal club is big enough to have fun together, but small enough for everybody to feel a part of the group. The average club in Delaware is typically 10 to 20 members, with two or three leaders. An adult or older youth who works voluntarily with a group of 4-H members.