| Plainfield Township | |
| Image Map1: | Pennsylvania in United States (US48).svg |
| Map Caption1: | Location of Pennsylvania in the United States |
| Coordinates: | 40.8333°N -75.2664°W |
| Subdivision Type: | Country |
| Subdivision Name: |  United States |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Northampton |
| Established Title: | Founded |
| Leader Title: | Mayor |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 64.69 |
| Area Total Sq Mi: | 24.98 |
| Area Land Km2: | 64.11 |
| Area Land Sq Mi: | 24.75 |
| Area Water Km2: | 0.58 |
| Area Water Sq Mi: | 0.22 |
| Elevation Ft: | 568 |
| Population As Of: | 2010 |
| Population Total: | 6138 |
| Pop Est As Of: | 2016 |
| Pop Est Footnotes: | [2] |
| Population Est: | 6153 |
| Population Density Km2: | 95.97 |
| Population Density Sq Mi: | 248.57 |
| Population Metro: | 865,310 (US: 68th) |
| Timezone1: | EST |
| Utc Offset1: | -5 |
| Timezone1 Dst: | EDT |
| Utc Offset1 Dst: | -4 |
| Area Code: | 610 |
| Blank Name: | FIPS code |
| Blank Info: | 42-095-61088 |
| Blank1 Name: | Primary airport |
| Blank1 Info: | Lehigh Valley International Airport |
| Blank2 Name: | Major hospital |
| Blank2 Info: | Lehigh Valley Hospital–Cedar Crest |
| Blank3 Name: | School district |
| Blank3 Info: | Pen Argyl Area |
| Blank2 Name Sec2: | Wikimedia Commons |
| Website: | plainfieldtownship.org |
Plainfield Township is a township in Northampton County, Pennsylvania, United States. The population of Plainfield Township was 6,138 at the 2010 census. The township is part of the Lehigh Valley metropolitan area, which had a population of 861,899 and was the 68th-most populous metropolitan area in the U.S. as of the 2020 census.
According to the U.S. Census Bureau, the township has a total area of, of which is land and, or 0.16%, of which is water. It is located in the Delaware River watershed and drained by Bushkill Creek and Martins Creek. Its natural northern boundary is Blue Mountain. Its seven villages are Belfast, Delabole, Edelman, Kesslersville, Miller, West Bangor, and West Pen Argyl.
Plainfield Township surrounds Pen Argyl in the northeast and nearly surrounds Wind Gap in the northwest.
As of 2015, there were of public roads in Plainfield Township, of which were maintained by the Pennsylvania Department of Transportation (PennDOT) and were maintained by the township.[3]
Pennsylvania Route 33 is the most prominent highway serving Plainfield Township. It follows a north-south alignment across the western portion of the township. Pennsylvania Route 191 follows a southwest-northeast alignment through the southern and eastern portions of the township. Pennsylvania Route 512 also follows a southwest-northeast alignment, but through the northern and western parts of the township.
As of the census[4] of 2000, there were 5,668 people, 2,130 households, and 1,637 families residing in the township. The population density was 229.2sp=usNaNsp=us. There were 2,191 housing units at an average density of 88.6sp=usNaNsp=us. The racial makeup of the township was 98.85% White, 0.37% African American, 0.02% Native American, 0.28% Asian, 0.14% from other races, and 0.34% from two or more races. Hispanic or Latino of any race were 0.67% of the population.
There were 2,130 households, out of which 30.4% had children under the age of 18 living with them, 68.0% were married couples living together, 5.6% had a female householder with no husband present, and 23.1% were non-families. 18.6% of all households were made up of individuals, and 9.0% had someone living alone who was 65 years of age or older. The average household size was 2.62 and the average family size was 3.00.
In the township, the population was spread out, with 22.2% under the age of 18, 6.1% from 18 to 24, 27.1% from 25 to 44, 27.8% from 45 to 64, and 16.7% who were 65 years of age or older. The median age was 42 years. For every 100 females, there were 96.9 males. For every 100 females age 18 and over, there were 93.2 males.
The median income for a household in the township was $49,019, and the median income for a family was $54,856. Males had a median income of $39,334 versus $25,145 for females. The per capita income for the township was $20,639. About 1.7% of families and 3.7% of the population were below the poverty line, including 2.9% of those under age 18 and 4.9% of those age 65 or over.
The township is served by the Pen Argyl Area School District. Students in grades nine through 12 attend Pen Argyl Area High School in Pen Argyl.