The number and duration of contacts between people in a synthetic population of the United States, stratified by CDC age groups and county of residence for each of the contacts. Each person/contact was assigned an activity template based on American Community survey data. Activities were assigned differently for weekdays and weekends and each activity are assigned based on location types, sizes, and distance from residence or catchment region. There is one file for each county for the weekday, for the weekend and at home in a ASCII text, comma-separated-value (CSV) format.