Simplify the following text for a Grade 6 native English-speaking person.
Original: NuillÃ - sur-Vicoin is a commune in the Mayenne department in north-western France .
Simplified: NuillÃ - sur-Vicoin is a commune of 1 184 people ( 2007 ) . It is found in the region Pays de la Loire in the Mayenne department in the northwest of France .