The reading was 0.1 percentage point lower than an earlier estimate of 5 percent by the labour ministry.
There were around 765,500 people without jobs across the nation at the end of October, down from 769,600 a month earlier, according to the state-run Statistics Poland (GUS) agency.
The statistics office reported earlier this week that employment in Polish companies decreased by 0.5 percent in October on average in year-on-year terms.
According to the European Union's Eurostat statistics agency, which uses a different methodology, unemployment in Poland stood at 2.9 percent in September, marking the second-lowest rate in the 27-nation bloc.
(gs)
Source: IAR, PAP