Why are American INGOs increasingly dispersing their activities globally, avoiding “crowded” areas, when concentrating efforts in areas of acute need may be more efficient or just? This chapter argues that American INGOs’ geographic choices are a response to growing population density. INGOs are increasingly seeking out new geographic niches because many once-popular countries are now “saturated” and can no longer easily support more organizations. We support this argument with a statistical analysis of original and existing data on INGOs’ locations as well as a qualitative case study of environmental conservation INGOs.