Plainfield is a township in Northampton County, Pennsylvania, home to about 6,241 people across 25 square miles. It has no ZIP code of its own: it’s part of 18040, 18064, 18072 and 18091.
Homes sold for a median of $217 per square foot across 4 ZIP codes in the three months ending August 2026, and all of them were seller’s markets.
Mostly Forks; part is in Plainfield
Mostly Upper Nazareth; part is in Plainfield
Mostly Pen Argyl; part is in Plainfield
Mostly Wind Gap; part is in Plainfield
Each card is that ZIP code’s whole market, including any part outside Plainfield. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Plainfield’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Newark Liberty International Airport (EWR)59 miles away |
|---|---|
| Closer regional airport | Lehigh Valley International Airport (ABE)13 miles away |
| Nearest city of 250,000+ | Philadelphia, PA56 miles away |
Straight-line distances from the center of Plainfield; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Plainfield had 6,263 residents in the 2020 census, up 10% since 2000.
It’s the 456th largest of 2,568 towns in Pennsylvania by population.
Northampton County grew from 99,687 residents in 1900 to 312,951 in 2020.
Northampton County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 86°F in summer, and winter lows average 22°F. About 51.2 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Phillipsburg-Easton Brg, NJ weather station (9 miles away).
121,192 jobs at 6,529 businesses in Northampton County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
307 doctors and other health care providers list an office in Plainfield’s ZIP codes.
Nearest hospitals
Providers with an office here
| Primary care doctors | 47 |
|---|---|
| Specialist doctors | 18 |
| Dentists | 22 |
| Nurse practitioners and physician assistants | 28 |
| Mental health providers | 63 |
| Physical and occupational therapists | 104 |
| Optometrists | 13 |
| Chiropractors | 12 |
| Pharmacies | 19 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (9 nearby)
Grocery stores (1 nearby)
Pharmacies (1 nearby)
Libraries
Museums
Theaters and performance venues (1 nearby)
Counts are within about 3.5 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Easton Area SD, Nazareth Area SD, Pen Argyl Area SD and others. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Forks El SchEaston | K–5 | 336 | Public | 7.3 mi |
| Kenneth N Butz Jr El SchNazareth | K–4 | 576 | Public | 2.2 mi |
| Lower Nazareth El SchNazareth | K–4 | 615 | Public | 7.4 mi |
| Plainfield El SchNazareth | K–3 | 434 | Public | 1.2 mi |
| Shafer El SchNazareth | K–4 | 559 | Public | 4.6 mi |
| Shawnee El SchEaston | K–5 | 567 | Public | 7.6 mi |
| Wind Gap MSPen Argyl | 4–8 | 510 | Public | 2.3 mi |
| Nazareth Area Intermediate SchNazareth | 5–6 | 752 | Public | 4.6 mi |
| Easton Area MSEaston | 6–8 | 1,879 | Public | 7.5 mi |
| Nazareth Area MSNazareth | 7–8 | 775 | Public | 4.6 mi |
| Career Institute of TechnologyEaston | 9–12 | 13 | Career and Technical | 4.0 mi |
| Nazareth Area HSNazareth | 9–12 | 1,607 | Public | 4.4 mi |
| Pen Argyl Area HSPen Argyl | 9–12 | 475 | Public | 4.6 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Holy FamilyNazareth | Pre-K–8 | 154 | Roman Catholic | 4.7 mi |
| Immaculate Conception SchoolPen Argyl | Pre-K–8 | 211 | Roman Catholic | 4.6 mi |
| Goddard SchoolEaston | K | 12 | Nonsectarian | 7.0 mi |
| Lehigh Learning AcademyNazareth | 9–12 | 58 | Nonsectarian | 4.7 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Forks, Upper Nazareth, Nazareth, Bushkill, Pen Argyl, Lower Nazareth, Wind Gap, Moore, Washington Township (Northampton County) and Lower Mount Bethel.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.