Abstract: Systems, apparatuses, and methods are described for allocating content items for addressable content campaigns that target users with certain user characteristics and non-addressable content campaigns that request a certain quantity of deliveries in content delivery schedules. The insertions of addressable content items of the addressable content campaigns during slots in the content delivery schedules may be based on the predicted viewership (e.g., a number of views by targeted recipients) of the addressable content items during the slots. The deliveries of the content items from the addressable and non-addressable content campaigns may be scheduled to optimize values associated with viewings by targeted recipients of the assigned addressable content items and values associated with a quantity of deliveries of assigned non-addressable content items. The allocations of the contents items may also comply with various timing, geographical, delivery, slot inventory-related, and/or campaign specified constraints.