The last missing person was found around two and a half weeks after the explosion in a hazardous waste incineration plant in Leverkusen.
The fire brigade and police had found the 50-year-old employee dead and identified, the Cologne police said.
The search for missing persons is now complete, but the clean-up work and evidence of the fire investigators at the site of the explosion continue, according to the message.
This increases the death toll in the accident to seven.
31 people suffered some serious injuries.
The public prosecutor's office in Cologne has initiated an investigation against unknown persons on suspicion of negligent homicide and negligent causing of an explosion.
She wants to find out whether human errors led to the disaster.
On July 27, there was an explosion in the hazardous waste incineration plant in Leverkusen.
The cause of the accident is still unclear.
The fear that plants and soil were heavily contaminated by pollutants in the explosion did not come true.
One week after the accident, the State Environment Agency of North Rhine-Westphalia announced that the analyzes showed “no relevant concentrations and no limit values exceeded”.