Caodaism finds its living center in Vietnam, the land in which it first emerged and where its spiritual and institutional heart still beats most strongly. Its practice is especially concentrated in the southern regions, including the Mekong Delta, with a particularly important focus on Tây Ninh Province, where the Holy See stands as the religion’s central temple and symbolic axis. From this locus, Caodaism radiates outward, shaping local religious life and offering a distinctive synthesis of Eastern and Western spiritual currents. The geography of its practice is therefore not merely a matter of demographics, but also a reflection of its historical roots and ritual life anchored in Vietnamese soil.

Regarding the number of adherents, estimates vary, yet a consistent picture emerges across careful accounts. Most sources place the Caodaist community in a range of roughly several million followers, commonly cited as about 4–6 million worldwide. The vast majority of these adherents reside in Vietnam, where the faith is woven into the religious and cultural fabric of many communities. Smaller Caodaist communities are also found abroad, particularly in countries such as the United States, Australia, and France, largely formed through Vietnamese diaspora networks. This spread suggests a tradition that, while firmly rooted in its homeland, has also carried its syncretic vision across borders, sustaining a shared spiritual identity among dispersed communities.