Military operations contributed to the success in curtailing the assassinations.
Pakistani security forces have killed 1,657 militants over the past two years, while Operation Radd-ul-Fasaad has continued these gains, observers say.
The attack brought widespread condemnation and the pledge that the census will continue undeterred.
Jamatul Ahrar, a faction of Tehreek-e-Taliban Pakistan, immediately took responsibility for the car bombing that killed more than 20 people in a busy market.
The privately-owned carrier has been accused of transporting weapons and fighters to conflict zones throughout the region, experts say.
The Pakistani capital has used a number of measures to stay free of terrorist attacks since April 2014.
More children are being kidnapped and turned into suicide bombers because militant groups have sustained heavy losses, officials and analysts say.
Residents of Sindh, Punjab and Balochistan can call 1135, while residents of KP and FATA can call 1125 to help prevent terrorist attacks.
Pakistani police, army and Rangers ensured the peaceful conclusion of the Pakistan Super League (PSL) in Lahore.
Hundreds of operations have already been launched since the beginning of the campaign on February 22 in response to wave of militant attacks.