| Official Name: | Armagh Township, Pennsylvania |
| Settlement Type: | Township |
| Mapsize: | 250x200px |
| Image Map1: | Map of Pennsylvania highlighting Mifflin County.svg |
| Mapsize1: | 250x200px |
| Map Caption1: | Map of Mifflin County, Pennsylvania |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Pennsylvania |
| Subdivision Type2: | County |
| Subdivision Name2: | Mifflin |
| Government Type: | Board of Supervisors |
| Leader Title: | Chairman |
| Leader Name: | Craig Bitner |
| Leader Title1: | Vice Chairman |
| Leader Name1: | Shane Tomlinson |
| Leader Title2: | Supervisor |
| Leader Name2: | Jon Tyler Bowersox |
| Established Title: | Settled |
| Established Date: | 1766 |
| Established Title1: | Incorporated |
| Established Date1: | 1770 |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 241.29 |
| Area Land Km2: | 240.45 |
| Area Water Km2: | 0.84 |
| Area Total Sq Mi: | 93.16 |
| Area Land Sq Mi: | 92.84 |
| Area Water Sq Mi: | 0.32 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Total: | 4019 |
| Population Density Km2: | 15.84 |
| Population Density Sq Mi: | 41.02 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Area Code: | 717 |
| Website: | Armagh Township |
| Pop Est As Of: | 2022 |
| Population Est: | 4012 |
| Blank Name: | FIPS code |
| Blank Info: | 42-087-03040 |
Armagh Township is a township in Mifflin County in the U.S. state of Pennsylvania. The population was 4,019 at the 2020 census.
It was named after the city and county of Armagh in Northern Ireland.
According to the United States Census Bureau, the township has a total area of 92.9sqmi, of which 92.8sqmi is land and 0.1sqmi (0.15%) is water.
At the 2000 census,[3] there were 3,988 people, 1,532 households and 1,118 families residing in the township. The population density was 43sp=usNaNsp=us. There were 1,956 housing units at an average density of 21.1/sq mi (8.1/km2). The racial makeup of the township was 98.80% White, 0.08% African American, 0.43% Asian, 0.20% from other races, and 0.50% from two or more races. Hispanic or Latino of any race were 0.70% of the population.
There were 1,532 householdsof which 31.9% had children under the age of 18 living with them, 61.1% were married couples living together, 7.4% had a female householder with no husband present, and 27.0% were non-families. 22.8% of all households were made up of individuals, and 11.6% had someone living alone who was 65 years of age or older. The average household size was 2.60 and the average family size was 3.07.
25.7% of the population were under the age of 18, 7.0% from 18 to 24, 28.0% from 25 to 44, 25.2% from 45 to 64, and 14.1% who were 65 years of age or older. The median age was 37 years. For every 100 females, there were 101.8 males. For every 100 females age 18 and over, there were 98.7 males.
The median household income was $35,260 and the median family income was $38,643. Males had a median income of $30,718 and females $18,520. The per capita income was $13,692. About 6.5% of families and 11.0% of the population were below the poverty line, including 13.8% of those under age 18 and 14.9% of those age 65 or over.