The best source of information on the population status of Philadelphia Vireo is the Breeding Bird Survey (BBS). Although there is a risk of misidentification with the similar-sounding Red-eyed Vireo, and the northernmost portion of its range is poorly covered, the BBS still has medium reliability overall. The national BBS trend shows a large long-term increase in abundance since the early 1970s, with most increases occurring in the early 1990s and over the last decade. At the regional level, there is more variation in trends: increases have occurred in southern and central Ontario and Quebec and the southern Boreal forest, while little change has occurred in the Maritimes and northern Alberta, and a large decrease has occurred in the Prairies. Long-term migration monitoring at Long Point Bird Observatory also shows large increases in both spring and fall, increasing overall confidence in the trend to high.

The goal for Philadelphia Vireo is to remain at or above its recent population level, based on the Breeding Bird Survey. Trend data show that Philadelphia Vireo is currently within its goal range.