| Official Name: | Lower Mahanoy Township, Pennsylvania |
| Settlement Type: | Township |
| Mapsize: | 250x200px |
| Image Map1: | Map of Pennsylvania highlighting Northumberland County.svg |
| Mapsize1: | 250x200px |
| Map Caption1: | Map of Northumberland County, Pennsylvania |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Pennsylvania |
| Subdivision Type2: | County |
| Subdivision Name2: | Northumberland |
| Government Type: | Board of Supervisors |
| Established Title: | Settled |
| Established Date: | 1777 |
| Established Title1: | Incorporated |
| Established Date1: | 1806 |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 66.31 |
| Area Land Km2: | 56.51 |
| Area Water Km2: | 9.80 |
| Area Total Sq Mi: | 25.60 |
| Area Land Sq Mi: | 21.82 |
| Area Water Sq Mi: | 3.79 |
| Population As Of: | 2010 |
| Population Total: | 1709 |
| Population Density Km2: | 29.52 |
| Population Density Sq Mi: | 76.45 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Area Code: | 570 |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [2] |
| Population Est: | 1668 |
| Blank Name: | FIPS code |
| Blank Info: | 42-097-44960 |
Lower Mahanoy Township is a township in Northumberland County, Pennsylvania, United States. The population at the 2010 Census was 1,709,[3] an increase over the figure of 1,586 tabulated in 2000.
The Dauphin County Bridge No. 27 was listed on the National Register of Historic Places in 1993.
According to the United States Census Bureau, the township has a total area of 25.5 square miles (65.9 km2), of which 21.9 square miles (56.8 km2) is land and 3.5 square miles (9.2 km2) (13.90%) is water.
As of the census[4] of 2000, there were 1,586 people, 634 households, and 486 families residing in the township. The population density was 72.3sp=usNaNsp=us. There were 691 housing units at an average density of 31.5sp=usNaNsp=us. The racial makeup of the township was 99.43% White, 0.38% African American, 0.06% from other races, and 0.13% from two or more races. Hispanic or Latino of any race were 0.19% of the population.
There were 634 households, out of which 29.7% had children under the age of 18 living with them, 67.5% were married couples living together, 5.0% had a female householder with no husband present, and 23.3% were non-families. 19.9% of all households were made up of individuals, and 9.1% had someone living alone who was 65 years of age or older. The average household size was 2.50 and the average family size was 2.85.
In the township the population was spread out, with 22.2% under the age of 18, 7.4% from 18 to 24, 28.0% from 25 to 44, 26.5% from 45 to 64, and 15.9% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 104.9 males. For every 100 females age 18 and over, there were 103.3 males.
The median income for a household in the township was $39,279, and the median income for a family was $43,750. Males had a median income of $31,183 versus $21,250 for females. The per capita income for the township was $17,097. About 2.6% of families and 6.0% of the population were below the poverty line, including 7.7% of those under age 18 and 7.7% of those age 65 or over.