Simplify the following text for a Grade 5 native English-speaking person.
Original: There were 94,416 housing units at an average density of 678.5 \/ kmÂ ( 1,757.3 \/ miÂ ) .
Simplified: There were 94,416 housing units at an average density of 1,757.3 \/ sq mi ( 678.5 \/ kmÂ ) .