The system, which launched across Europe in October 2025, records the personal and biometric data of non-EU travellers each time they cross into or out of the 29 participating European countries.
It stores names, dates of birth, nationality, travel dates, facial images and fingerprints, as well as any record of denied entry.
Interior Minister Marcin Kierwiński announced the milestone at Warsaw's Chopin Airport on Friday, describing it as "a landmark moment for the security of Poland and the European Union".
He said the country had gone from being significantly behind schedule to leading the continent in rolling out the system within two years.
Officials said EES had already proved its worth.
More than 6,500 people have been refused entry into the EU through Poland's borders under the system, according to deputy minister Tomasz Szymański.
In one case, a Georgian national attempting to cross under a false name was identified through fingerprints already stored in the database.
In another, a Moldovan citizen was stopped after a record showed an entry ban issued by another EU country.
EU citizens, diplomats, NATO soldiers and their families are exempt from registration.
Polish authorities said EES would be followed by the updated Eurodac system, which will enable real-time biometric checks on people attempting to enter the Schengen zone from outside the EU.
(ał)
Source: PAP