New Testament churches were autonomous congregations under the supervision of their own leadership. They shared similar traditions and practices, while being distinct congregations. Yet there was a great amount of interdependence. They maintained an active relationship with one another so that each church saw itself as part of the whole.
We (Charity Baptist Church) belong to an association of churches known as the General Association of Regular Baptist Churches (GARBC). The purpose being mutual support and cooperation efforts. You can learn more about the GARBC at their website: www.garbc.org