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Some 20 people have been arrested during the searches, iTele reported, adding that police did not find any explosives or arms during the operation.
The operation is not connected to the recent Nice attacks, a justice official told Reuters.
"Raids are conducted in two locations by DGSI [General Directorate for Internal Security], with the support of the elite RAID [Research, Assistance, Intervention, Deterrence] police officers," a police source told AFP.
The operation is taking place near the Dassault mosque and Al Bayyinah Islamic library in the town, French media reported.
Le Parisien newspaper reported that the first search took place on Parc avenue near the mosque and targeted a house where a certain family lived.
All members of the family, including children, have been arrested.
The second search was in Val Sud neighborhood and also targeted a household. Both zones are currently cordoned off by police.
Local witnesses told Le Parisien that police used rubber bullets during the operation.
A helicopter has reportedly been deployed in the area, iTele added.
RT France correspondent Fabien Buzzanca reported that police are not conducting operations inside the mosque or library, but in nearby residential buildings.
The raids were conducted following an intelligence tip-off from an anonymous source, police told Le Figaro newspaper. The information from the source claimed a violent attack may have been planned. The source, however, did not specify the location of the planned attack.
Argenteuil is a commune in the northwestern suburbs of Paris, located 12km from the capital. It has a population of about 100,000 residents.
It is not the first anti-terrorist operation to be conducted in Argenteuil. In March this year, police arrested Reda Kriket, a terror suspect who was believed to be in the final stages of preparing a new terrorist attack in France and has links to Abdelhamid Abaaoud, a mastermind behind the November 2015 Paris attacks.
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