Join 4-H! Joining a club is a great way to get involved in 4-H. Contact the Santa Cruz Cooperative Extension office in Nogales (520) 281-2994 for more information. 4-H is the non-formal youth development education program of the United States Department of Agriculture and the University of Arizona. Whether you live in the city, the suburbs, or on a farm/ranch, you can belong to the 4-H Program.