| Total number led homes in Mercer Borough, by type |  | 
| Total Home Population: | 904 | 
| Population of Family homes: | 527 | 
| Population of 15 to 24 year olds: | 29 | 
| Population of 25 to 34 year olds: | 84 | 
| Population of 35 to 44 year olds: | 106 | 
| Population of 45 to 54 year olds: | 113 | 
| Population of 55 to 59 year olds: | 45 | 
| Population of 60 to 64 year olds: | 44 | 
| Population of 65 to 74 year olds: | 52 | 
| Population of 75 to 84 year olds: | 42 | 
| Population of 85 year olds and over: | 12 | 
| Population of Nonfamily Homes: | 377 | 
| Population of 15 to 24 year olds: | 28 | 
| Population of 25 to 34 year olds: | 36 | 
| Population of 35 to 44 year olds: | 33 | 
| Population of 45 to 54 year olds: | 72 | 
| Population of 55 to 59 year olds: | 34 | 
| Population of 60 to 64 year olds: | 29 | 
| Population of 65 to 74 year olds: | 64 | 
| Population of 75 to 84 year olds: | 48 | 
| Population of 85 year olds and over: | 33 |