| City: | Portland, Pennsylvania |
| County: | Northampton County |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 9:38:01 PM |
| Population: | 494 [See All] |
| Area Codes: | 272 / 570 / 610 / 835 |
| Classification: | PO Box |
| Coordinates: | 40.9216, -75.0974 |
| Land Area: | 0.331 sq mi |
| Quick Link: |
Portland is a small borough in Northampton County, Pennsylvania, where PO Box service is the only way to receive mail. Despite being classified as a PO Box ZIP, the area has 2 rural carrier routes serving 38 delivery points across 18 street names, but this doesn't provide standard street delivery. This is a PO Box Only Zone, which means there's no alternative delivery method anywhere in the area.
The Portland post office maintains 225 PO Boxes for 216 occupied households. That's an adoption rate of 1.04, meaning the post office serves not just local residents but also people from the surrounding area. With 494 residents living in just 0.06 square miles, Portland is a compact community where everyone relies on the post office for mail access.
Portland's streets include Delaware Avenue (8 delivery points), State Street (5 points), and Main Street (4 points, with some apartments). The street pattern shows a traditional small-town layout with avenues named for states (Delaware, Pennsylvania) and basic town streets. One named building appears in postal records: Postmaster.
The community has 494 residents with a median age of 43.7 years. Housing includes 243 total units, with 216 occupied and 27 vacant. Owner-occupied homes (134) outnumber rentals (82). Median household income is $71,667, and median home value is $258,600. About 31% of workers work from home, and transportation/warehousing employs 270 workers in the area, suggesting logistics or distribution activity nearby.
All mail to Portland must be addressed to a PO Box. The format is:
PO Box [number]
Portland, PA 18351This ZIP code was established before October 2004. Portland is in the Allentown-Bethlehem metro area, with nearby historic districts including Bangor Central Historic District (6.6 miles away) and Ackermanville Historic District (8.0 miles).
Streets follow traditional small-town naming with state names (Delaware, Pennsylvania) and core town streets.
ZIP Code 18351 has 494 residents and 216 households (average 2.29 persons per household). The median age is 43.7 years, slightly older than the state (41.0) and older than the nation (38.8). The gender split is 51.0% male and 49.0% female, which is slightly higher than the state male share (48.9%), making this a male-majority area. Largest groups are White (88.7%, much higher than the state average of 75.0% and well above the national average of 61.6%) and Hispanic or Latino (5.7%); Hispanic or Latino residents make up 5.7%, which is much lower than the national average (18.7%).
Explore More: Population Over Time By Age & Gender By Race By Gender Nativity & Citizenship
| 2020 Population: | 494Source: Census DHC |
| 2024 ACS Population Estimate: | 546Source: Census ACS |
| 2026 ZC Population Estimate: | 0Source: ZIP-Codes.com |
| Population Density: | 1,492.4 people per sq mile |
| Average Income: | $52,679Source: Census ACS |
| Households: | 216Source: Census DHC |
| Average House Value: | $266,900Source: Census ACS |
| Persons Per Household: | 2.29Source: Census DHC |
| Average Family Size: | 3.46Source: Census ACS |
| Group | 2010 | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Census ACS Population Estimate | -- | 441 | 457 | 570 | 523 | 431 | 482 | 452 | 428 | 600 | 549 | 507 | 606 | 695 | 546 |
| Decennial Census | 518 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 494 | -- | -- | -- | -- |
Median Age: 43.7
Male Median Age: 43.5
Female Median Age: 43.8
| Group | < 5 | 5-9 | 10-14 | 15-19 | 20-24 | 25-29 | 30-34 | 35-39 | 40-44 | 45-49 | 50-54 | 55-59 | 60-64 | 65-69 | 70-74 | 75-79 | 80-84 | 85+ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Male | 14 | 6 | 10 | 17 | 8 | 19 | 23 | 11 | 21 | 15 | 23 | 18 | 20 | 16 | 13 | 4 | 6 | 8 |
| Female | 15 | 14 | 15 | 8 | 17 | 19 | 12 | 12 | 12 | 11 | 15 | 26 | 23 | 10 | 11 | 11 | 5 | 6 |
| Total | 29 | 20 | 25 | 25 | 25 | 38 | 35 | 23 | 33 | 26 | 38 | 44 | 43 | 26 | 24 | 15 | 11 | 14 |
| White: | 438 | 89.21% |
| Black: | 4 | 0.81% |
| Hispanic:* | 28 | 5.70% |
| Asian: | 3 | 0.61% |
| American Indian: | 2 | 0.41% |
| Hawaiian: | 1 | 0.20% |
| Other: | 15 | 3.05% |
| Total: | 491 | 100% |
| Gender | Count | % | Median Age |
|---|---|---|---|
| Males: | 252 | 51.01% | 43.5 years |
| Females: | 242 | 48.99% | 43.8 years |
| Total: | 494 | 100% | 43.7 years |
| Native, born in the United States: | 498 | 91.21% |
| Native, born in PR, Island Areas, or abroad: | 0 | 0.00% |
| Foreign born, naturalized U.S. citizen: | 41 | 7.51% |
| Foreign born, not a U.S. citizen: | 7 | 8.79% |
| Total Population: | 546 | 100% |
| Total Native Population: | 498 | 91.21% |
| Total Foreign-born Population: | 48 | 8.79% |
In 2024, the Median household income is $52,679, which is far less than the national median ($80,734), is up $13,054 (32.9%) since 2011 and below its 2019 pre-pandemic level by $4,071. Family households earn a median of $42,422 versus $73,000 for nonfamily households (a difference of $30,578). By gender, male median income is $75,521 and female is $35,795, which is considerably lower than the national female median ($55,274), with a current gap of $39,726 that has widened from 2011 to 2024. The labor-force participation rate is 60.0%, which is falls short of the national rate (63.5%). The unemployment rate is 4.0%, which is lower than the national rate (5.2%). The largest occupation group is Sales (28.2%).
Explore More: Income Over Time Household Income Employment Status By Occupation
| Income Type | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Household Income | $39,625 | $39,183 | $42,500 | $45,250 | $46,250 | $50,625 | $56,667 | $47,188 | $56,750 | $52,321 | $58,068 | $61,250 | $71,667 | $52,679 |
| Median Family Income | $60,938 | $39,821 | $53,194 | $53,194 | $54,219 | $68,750 | $76,042 | $69,375 | $71,250 | $71,250 | $58,125 | $54,063 | $55,703 | $42,422 |
| Median NonFamily Income | $31,250 | $38,438 | $31,458 | $30,972 | $31,458 | $36,250 | $33,393 | $31,612 | $31,840 | $33,580 | $47,143 | $55,000 | $89,107 | $73,000 |
| Median Male Income | $50,938 | $38,542 | $37,250 | $68,333 | $0 | $0 | $71,875 | $71,667 | $40,556 | $38,125 | $44,375 | $57,500 | $68,571 | $75,521 |
| Median Female Income | $35,500 | $38,594 | $31,083 | $31,607 | $0 | $30,781 | $27,232 | $33,750 | $50,000 | $0 | $54,167 | $0 | $46,563 | $35,795 |
| Employed: | 266 | 57.58% |
| Unemployed: | 11 | 2.38% |
| Not In Labor Force: | 185 | 40.04% |
| Total: | 462 | 100% |
| Management, business, science, and arts: | 58 | 21.80% |
| Service: | 40 | 15.04% |
| Sales and Office: | 75 | 28.20% |
| Natural resources, construction, and maintenance: | 49 | 18.42% |
| Production, transportation, and material moving: | 44 | 16.54% |
| Total Civilian Employed Population: | 266 | 100% |
In 2024, the median home value is $266,900, which is well under the national median ($332,700), is up $67,800 (34.05%) since 2011 and above its 2019 pre-pandemic level by $86,200. The median gross rent is $1,217, which is far less than the national median ($1,413), is up $342 (39.09%) since 2011 and above its 2019 pre-pandemic level by $132. Of occupied housing, owners make up 54.04% (42.52% with a mortgage, 57.48% free-and-clear) and renters 45.96% - making this ZIP Code higher than national rental averages. The vacancy rate is 18.69%, which is markedly above the national rate (10.12%).
Explore More: Compare Home Value Home Value Over Time Rent & Over Time Housing Occupancy
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Home Value | $199,100 | $203,300 | $195,500 | $161,400 | $157,900 | $158,500 | $162,500 | $150,000 | $180,700 | $177,100 | $175,000 | $211,700 | $258,600 | $266,900 |
| Less than $500: | 0 | 0.00% |
| $500 to $999: | 28 | 25.93% |
| $1,000 to $1,499: | 60 | 55.56% |
| $1,500 to $1,999: | 0 | 0.00% |
| $2,000 to $2,499: | 3 | 2.78% |
| $2,500 to $2,999: | 17 | 15.74% |
| $3,000 or more: | 0 | 0.00% |
| No Rent: | 0 | 0.00% |
| Total: | 108 | 100% |
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Rent | $875 | $820 | $883 | $956 | $891 | $1,047 | $1,077 | $962 | $1,085 | $1,042 | $1,537 | $1,369 | $1,354 | $1,217 |
| Owner Occupied (with mortgage): | 54 | 22.98% |
| Owner Occupied (free and clear, no mortgage): | 73 | 31.06% |
| Renter Occupied: | 108 | 45.96% |
| Total Occupied Housing Units: | 235 | 100% |
| Occupied Housing Units: | 235 | 81.31% |
| Vacant Housing Units (not graphed): | 54 | 18.69% |
| Total Housing Units: | 289 | 100% |
| Single-Family Units: | 213 | 73.70% |
| Multi-Family Units: | 76 | 26.30% |
| Other Units: | 0 | 0.00% |
| Total Housing Units: | 289 | 100% |
In 2024, 18.80% of adults (25+) have a bachelor's degree or higher, which is far lower than the national rate (35.70%). High school or higher is 94.80%, which is comparable to the national rate (89.60%). The uninsured rate is 3.70%, which is comparable to the national rate (8.40%). The share of people in poverty is 22.80%, which is comparable to the national rate (8.80%), up 7.00 percentage points since 2011 and above its 2019 pre-pandemic level by 7.20 percentage points. This signals a sharp increase in hardship - a shrinking consumer base, heavy pressure on public services, and job-market contraction risks. Among residents ages 3+, the largest enrollment group is high school (33.91%). College enrollment is 25.22%, which is comparable to the national rate (26.70%), meaning the community mirrors broader higher-education participation.
Explore More: Educational Attainment Health Insurance Poverty Over Time School Enrollment
| Less than 9th grade: | 3 | 0.78% |
| 9th to 12th grade, no diploma: | 17 | 4.44% |
| High school graduate (includes equivalency): | 173 | 45.17% |
| Some college, no degree: | 55 | 14.36% |
| Associate's degree: | 63 | 16.45% |
| Bachelor's degree: | 43 | 11.23% |
| Graduate or professional degree: | 29 | 7.57% |
| Total: | 383 | 100% |
| High school or higher: | 363 | 94.78% |
| Bachelor's degree or higher: | 72 | 18.80% |
| Private Insurance: | 399 | 64.46% |
| Public Insurance: | 200 | 32.31% |
| No Insurance: | 20 | 3.23% |
| Total: | 619 | 100% |
| Has Health Insurance: | 599 | 96.77% |
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| % of People in Poverty | 10.3% | 19.5% | 16.1% | 25.5% | 26.1% | 17.5% | 8.5% | 7.8% | 10.1% | 8.3% | 20.5% | 17.3% | 17.3% | 22.8% |
Note: Counts of Families & People in poverty are not published at the ZIP Code level due to small sample sizes. Percentages shown are survey estimates from the American Community Survey (ACS). They may differ from official poverty statistics. The U.S. Census Bureau defines poverty status by comparing a family's or individual's total income with federal poverty thresholds that vary by family size and composition.
| Nursery School, Preschool: | 20 | 17.39% |
| Kindergarten: | 0 | 0.00% |
| Elementary school (grades 1-8): | 27 | 23.48% |
| High school (grades 9-12): | 39 | 33.91% |
| College or graduate school: | 29 | 25.22% |
| Total: | 115 | 100% |
| Early Childhood: | 20 | 17.39% |
| K-12 (Primary & Secondary School): | 66 | 57.39% |
ZIP Code 18351 supports both business and residential activity. According to the Business Census (2024), there are 16 business establishments, employing about 217 people with an annual payroll of $11,308,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 253Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 16Source: CBP |
| 1st Quarter Payroll: | $2,728,000Source: CBP |
| Annual Payroll: | $11,308,000Source: CBP |
| # of Employees: | 217Source: CBP |
ZIP Code 18351 is located in Northampton County, Pennsylvania, within the Allentown-Bethlehem-Easton, PA-NJ Metropolitan Statistical Area (CBSA 10900) and Pennsylvania's 7th Congressional District. This Metro area has a population of 821,173 people, about 0.06% of whom live in ZIP Code 18351. It covers 0.331 sq mi of land and a water area of 0.052 sq mi.
| CBSA Name: | Allentown-Bethlehem-Easton, PA-NJSource: Census |
| CBSA Number: | 10900Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 821,173Source: Census |
| MSA: | Allentown-Bethlehem-Easton, PA MSASource: Census |
| Land Area: | 0.331 sq miSource: Census |
| Water Area: | 0.052 sq miSource: Census |
| Congressional District: | 07Source: USPS |
| Congressional Land Area: | 862.56 sq miSource: Census |
| PMSA: | --Source: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 4262264Source: Census |
| Place Name: | Portland borough; PennsylvaniaSource: Census |
We could not locate which school district 18351 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on February 1, 2026.