On outskirts of city vs on outskirt of city

Some examples from the web:

• Europe's families are increasingly living on the outskirts of large cities.
• It's a run-down sports facility on the outskirts of the city.
• They're moving everyone to a fallout shelter on the outskirts of the city.
• Conflicting reports exist as to what really happened in the camp on the outskirts of the city of Laâyoune.
• Looks like Chloe and Davis are on the outskirts of Edge City, and so am I.
• Details are sketchy, but 90 minutes ago a man shot and killed two gang members at a park on the outskirts of the city.
• We are watching live footage of an Army convoy... arriving on the outskirts of the city to restore order.
• I was born in a town on the outskirts of a big city.
• Italian press sources have reported that, on 1 April 2008, the Milan City Council cleared two shantytowns on the outskirts of that city.
• If you hurry, you can find Braun in a villa on the outskirts of the city.
• Maybe some rapporteur might be able to include in their report on constitutional rights a paragraph on the rights - to physical integrity, safety and ownership - of the Europeans who live on the outskirts of our cities.
• Its profitability is questionable, there are deep concerns as regards safety and, most importantly, the environmental impact would be terrible if we were to build a pylon taller than the Empire State Building on the outskirts of the city of Messina.
• Near the place where I was living... on the outskirts of the city... stood the networked factories... the "sleep dealers".
• According to reports by a European news agency, the journalist and political activist Medardo Flores died on Thursday, 8 September 2011, after suffering multiple gunshot wounds whilst returning from his property in the outskirts of the Honduran city of Puerto Cortés.
• The same must be said of an indiscriminate rate on hydrocarbons and on energy which may penalise the weaker sections of the population who take two hours to get to work because they live in the outskirts of the cities.
• Everyday an army of about 5,000 people called dabbawalas travel around the outskirts of the city collecting lunches in tins, like these ones here.
• Look, I'll take you back to the outskirts of the city.
• They've walled the doors and windows in the outskirts of the city.
• I'm going to try and go to the outskirts of the city slyly and do a ring-road approach.
• Meanwhile, on the city outskirts, Arthur told Odile how he once met a fellow who walked this way...

Some examples from the web:

• Europe's families are increasingly living on the outskirts of large cities.
• It's a run-down sports facility on the outskirts of the city.
• They're moving everyone to a fallout shelter on the outskirts of the city.
• Conflicting reports exist as to what really happened in the camp on the outskirts of the city of Laâyoune.
• Looks like Chloe and Davis are on the outskirts of Edge City, and so am I.
• Details are sketchy, but 90 minutes ago a man shot and killed two gang members at a park on the outskirts of the city.
• We are watching live footage of an Army convoy... arriving on the outskirts of the city to restore order.
• I was born in a town on the outskirts of a big city.
• Italian press sources have reported that, on 1 April 2008, the Milan City Council cleared two shantytowns on the outskirts of that city.
• If you hurry, you can find Braun in a villa on the outskirts of the city.
• Its profitability is questionable, there are deep concerns as regards safety and, most importantly, the environmental impact would be terrible if we were to build a pylon taller than the Empire State Building on the outskirts of the city of Messina.
• Maybe some rapporteur might be able to include in their report on constitutional rights a paragraph on the rights - to physical integrity, safety and ownership - of the Europeans who live on the outskirts of our cities.
• Near the place where I was living... on the outskirts of the city... stood the networked factories... the "sleep dealers".
• Everyday an army of about 5,000 people called dabbawalas travel around the outskirts of the city collecting lunches in tins, like these ones here.
• Look, I'll take you back to the outskirts of the city.
• They've walled the doors and windows in the outskirts of the city.
• I'm going to try and go to the outskirts of the city slyly and do a ring-road approach.
• According to reports by a European news agency, the journalist and political activist Medardo Flores died on Thursday, 8 September 2011, after suffering multiple gunshot wounds whilst returning from his property in the outskirts of the Honduran city of Puerto Cortés.
• This hospital was situated by 'planning experts' at the outskirts of the city, mainly in order to avoid traffic congestion, which was a serious problem in its previous location in the city centre.
• The same must be said of an indiscriminate rate on hydrocarbons and on energy which may penalise the weaker sections of the population who take two hours to get to work because they live in the outskirts of the cities.