Authorities have named Oussama Atar as the man possibly behind the attacks on the two cities over the past year by the self-proclaimed Islamic State, or I-S.
The news comes as the city's Bataclan concert hall prepares to reopen on Saturday, a day before the anniversary of the attacks.
Investigators believe the same I-S cell was behind the Paris attacks on November the 13th last year and the Brussels attacks in March this year that, together, killed 162 people.
A judicial official and a security official have reportedly said Oussama Atar's name appears in the investigation.
And they say there is evidence Mr Atar is the real identity of Abu Ahmed, a pseudonym of the suspected attack coordinator whose whereabouts remain unknown.
They were France's worst-ever militant attacks, killing 129 people in a series of coordinated suicide bombings and shootings targeting popular Parisian recreational spots.
At the time, French president Francois Hollande said the country had to stick together.
"We also have to show unity and keep our cool. France must be strong and great, and the state must be strong. We also have to call on everyone to be responsible. What the terrorists want is to make us afraid, to seize us with fear."
The latest reports come as Paris prepares to reopen the Bataclan concert hall on Saturday, a day before the anniversary of the attack that left 90 people dead there.
For those who call Paris home, memories of November the 13th linger.
A woman named Charlotte lives very near the Bataclan.
"I don't know. The calm is quite surprising. The neighbourhood wants to go back to normal, but sometimes it's disturbing. Sometimes, we want to act as if nothing happened, and, other times, we are very aware of it. It's special. It's like if, sometimes, it was a parenthesis that we wanted to forget, but it's there. We don't talk about it regularly anymore, but we know the anniversary is coming, so it comes up more in conversations."
The Paris attackers struck almost simultaneously in different parts of the French capital.
Along with the Bataclan, the attacks also occurred in restaurants and cafes, with deaths reported across the city.
At the Le Petit Cambodge, an attacker gunned down 15 people sitting out in front of the restaurant.
The area now regularly attracts tourists and journalists, who stop to take photos.
A woman named Caroline, who lives and works near the Le Petit Cambodge, says it remains her favourite restaurant.
She says, while she continues to eat at the renovated restaurant, it is hard not to be affected by what happened.
"The day before the attacks, I had lunch at Le Petit Cambodge. We're all very affected. It's a very painful event for everybody, very sad. It's impossible to not think about it, but I'm not scared. It happened here, but it could have happened elsewhere. It's true that they wanted to hit the neighbourhood, but you're not safe anywhere, really. We've rebuilt the area. The Le Petit Cambodge has redone the decoration. Le Carillon is still there. Life is returning to normal."
The Bataclan also continues to attract people paying their respects, such as this man named William, a tourist from Holland.
"We are on holidays in Paris, and, because of the events last year, we wanted to see where it happened and just think about it again. I wanted to see it just to get an idea where it happened and think about it. It's still close. I am not in shock, but I am ... like, it makes me silent when I see this."
A year later, the city's tourism industry continues to be affected.
Kona is a Paris taxi driver.
He says tourist numbers have dropped since the attacks, affecting business.
"Yes, there's a big impact on tourism. People don't come to France as much anymore. They go to other countries, like Italy. We really feel it with our customers. Usually, even if it was short fares, we'd do around 15, but now we do five or seven."
The British singer Sting will reopen the Bataclan concert hall on Saturday.
On the day of the anniversary itself, survivors of the attack will attend the unveiling of a plaque in front of the concert hall, but the building itself will remain closed.
Still reeling from the I-S attacks in Paris, France was also hit with another major attack this year.
In July, nearly 80 people were killed when a truck ploughed into a crowd in the French Riviera resort of Nice during Bastille Day celebrations.
