This number marked an increase from 1,021,000 the previous month, the Statistics Poland (GUS) agency reported.
These foreign workers hailed from more than 150 countries, with 67.7 percent coming from Ukraine, Statistics Poland said this week.
Belarusians account for 11.5 percent of the foreign workforce, followed by Georgians at 2.5 percent, Indians at 1.9 percent, Moldovans at 1.3 percent, and Filipinos at 1.2 percent.
An estimated 2.5 million foreigners live in Poland, according to a study earlier this year by the Polish Economic Institute (PIE), a Warsaw-based think tank.
In recent years, there has been a significant increase in the number of Ukrainians working in the off-the-books tax-evading segment of the economy, according to the Polish Economic Institute.
The trend has gained momentum since Russia invaded Ukraine in February 2022.
As of the end of September, over 779,000 Ukrainians, 135,000 Belarusians and 27,000 Georgians were registered for Polish social security benefits, including old-age and disability pensions, according to the state-run Social Insurance Institution (ZUS).
As Poland faces a labour shortage and an aging population, major employer organisations are advocating for "legal, sustainable wage-based immigration" to bridge gaps in the job market.
According to the Rzeczpospolita newspaper, many Polish entrepreneurs are worried that stricter immigration policies could make it harder to hire workers.
Few foreign workers in Poland perform highly skilled jobs, according to a study published in the summer.
(gs)
Source: IAR, PAP, stat.gov.pl