Described as having a patchy distribution, but common, and therefore of low conservation concern (Parker et al. 1996). Not globally threatened; common or fairly common along the coast, but rarer inland. Some areas have seen a decline in numbers (Turner 2004). According to BirdLife International (2009), although the population trend appears to be decreasing, the decline is not rapid enough to qualify for Vulnerable status; it is classified as a species of Least Concern. The population size is very large, estimated to be upwards of 500,000 individuals (BirdLife International 2009).
The relative abundance of the Mangrove Swallow is assessed as common to fairly common (Mexico; Howell and Webb 1995), "uncommon to locally abundant" (Costa Rica; Stiles and Skutch 1989), and "locally common" (Panama; Ridgely and Gwynne 1989).