| City: | Mifflinville, Pennsylvania |
| County: | Columbia County |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 1:36:15 AM |
| Population: | 1,122 [See All] |
| Area Codes: | 272 / 570 |
| Classification: | PO Box |
| Coordinates: | 41.0267, -76.2921 |
| Land Area: | 1.422 sq mi |
| Quick Link: |
Mifflinville is a small Pennsylvania borough in Columbia County where PO Boxes aren't just common. They're the only option. This is officially designated a PO Box Only Zone, meaning there's no alternative mail delivery across its 1.37 square mile territory. With 455 PO Boxes serving 467 households, 97% of residents rely exclusively on the Mifflinville post office.
The community of 1,122 residents maintains the character of a traditional Pennsylvania small town. Street names follow a numbered grid (E 1st through E 7th, W 1st through W 7th) intersected by Fair Street, Market Street, and Race Street. This layout is typical of 19th-century Pennsylvania borough planning. Median age sits at 46.4 years, and household income averages $49,643.
Rural carrier routes (2 distinct routes serving 138 delivery points) handle what little street delivery exists, but the vast majority of mail goes to PO Boxes. The post office also maintains general delivery service. Employment patterns show unusually high concentration in transportation and warehousing (394 workers), likely reflecting the borough's location along regional freight corridors. About 23% of workers operate from home.
Mifflinville covers just 1.37 square miles but has been part of the postal system since before October 2004 when USPS began tracking introduction dates. The classification as PO Box only has remained unchanged. For anyone mailing to Mifflinville, a PO Box address is required. There's no street delivery option.
Numbered grid layout (E/W 1st-7th Streets) with traditional Pennsylvania street names like Fair, Market, and Race reflects 19th-century borough planning.
ZIP Code 18631 has 1,122 residents and 467 households (average 2.40 persons per household). The median age is 46.4 years, older than the state (41.0) and significantly older than the nation (38.8). The gender split is 48.9% male and 51.1% female, which is about the same as the national male share (49.1%), making this a female-majority area. Largest groups are White (95.7%, much higher than the state average of 75.0% and well above the national average of 61.6%) and Hispanic or Latino (2.4%); Hispanic or Latino residents make up 2.4%, 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: | 1,122Source: Census DHC |
| 2024 ACS Population Estimate: | 1,109Source: Census ACS |
| 2026 ZC Population Estimate: | 0Source: ZIP-Codes.com |
| Population Density: | 789.0 people per sq mile |
| Average Income: | $49,643Source: Census ACS |
| Households: | 467Source: Census DHC |
| Average House Value: | $214,900Source: Census ACS |
| Persons Per Household: | 2.40Source: Census DHC |
| Average Family Size: | 2.96Source: Census ACS |
| Group | 2010 | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Census ACS Population Estimate | -- | 1,262 | 1,194 | 1,380 | 1,376 | 1,386 | 1,394 | 1,287 | 1,257 | 1,180 | 973 | 904 | 1,134 | 1,109 |
| Decennial Census | 1,286 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 1,122 | -- | -- | -- |
Median Age: 46.4
Male Median Age: 40.9
Female Median Age: 51.1
| 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 | 26 | 23 | 46 | 27 | 38 | 37 | 33 | 28 | 37 | 47 | 30 | 37 | 37 | 29 | 32 | 25 | 10 | 7 |
| Female | 25 | 25 | 25 | 21 | 25 | 35 | 33 | 30 | 31 | 27 | 35 | 40 | 72 | 43 | 36 | 38 | 14 | 18 |
| Total | 51 | 48 | 71 | 48 | 63 | 72 | 66 | 58 | 68 | 74 | 65 | 77 | 109 | 72 | 68 | 63 | 24 | 25 |
| White: | 1,074 | 95.72% |
| Black: | 3 | 0.27% |
| Hispanic:* | 27 | 2.41% |
| Asian: | 2 | 0.18% |
| American Indian: | 1 | 0.09% |
| Hawaiian: | 7 | 0.62% |
| Other: | 8 | 0.71% |
| Total: | 1,122 | 100% |
| Gender | Count | % | Median Age |
|---|---|---|---|
| Males: | 549 | 48.93% | 40.9 years |
| Females: | 573 | 51.07% | 51.1 years |
| Total: | 1,122 | 100% | 46.4 years |
| Native, born in the United States: | 1,090 | 98.29% |
| Native, born in PR, Island Areas, or abroad: | 0 | 0.00% |
| Foreign born, naturalized U.S. citizen: | 19 | 1.71% |
| Foreign born, not a U.S. citizen: | 0 | 1.71% |
| Total Population: | 1,109 | 100% |
| Total Native Population: | 1,090 | 98.29% |
| Total Foreign-born Population: | 19 | 1.71% |
In 2023, the Median household income is $49,643, which is far less than the national median ($78,538), is down $7,316 (12.8%) since 2011 and above its 2019 pre-pandemic level by $643. Family households earn a median of $71,339 versus $15,865 for nonfamily households (a difference of $55,474). By gender, male median income is $44,375 and female is $49,432, which is far less than the state female median ($54,031), with a current gap of $5,057 that has narrowed from 2011 to 2023. The labor-force participation rate is 53.3%, which is considerably lower than the national rate (63.5%). The unemployment rate is 0.0%, which is considerably lower than the state rate (5.2%). The largest occupation group is Management (34.9%).
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Household Income | $56,959 | $57,000 | $58,791 | $53,922 | $52,664 | $44,432 | $43,393 | $47,206 | $49,000 | $45,714 | $46,250 | $51,875 | $49,643 |
| Median Family Income | $56,014 | $56,813 | $57,977 | $52,885 | $53,836 | $52,083 | $44,821 | $52,917 | $60,000 | $59,688 | $63,365 | $70,208 | $71,339 |
| Median NonFamily Income | $50,909 | $49,044 | $41,250 | $41,827 | $42,500 | $42,917 | $33,021 | $34,773 | $26,750 | $0 | $16,196 | $0 | $15,865 |
| Median Male Income | $50,982 | $53,167 | $52,917 | $55,909 | $54,821 | $52,045 | $50,847 | $50,132 | $41,321 | $35,060 | $32,344 | $38,333 | $44,375 |
| Median Female Income | $31,993 | $32,386 | $33,277 | $35,152 | $35,000 | $33,043 | $33,385 | $35,326 | $35,375 | $37,750 | $36,625 | $48,029 | $49,432 |
| Employed: | 498 | 53.26% |
| Unemployed: | 0 | 0.00% |
| Not In Labor Force: | 437 | 46.74% |
| Total: | 935 | 100% |
| Management, business, science, and arts: | 174 | 34.94% |
| Service: | 104 | 20.88% |
| Sales and Office: | 102 | 20.48% |
| Natural resources, construction, and maintenance: | 20 | 4.02% |
| Production, transportation, and material moving: | 98 | 19.68% |
| Total Civilian Employed Population: | 498 | 100% |
In 2023, the median home value is $214,900, which is far less than the national median ($303,400), is up $69,700 (48.00%) since 2011 and above its 2019 pre-pandemic level by $80,900. The median gross rent is $990, which is well under the national median ($1,348), is up $401 (68.08%) since 2011 and above its 2019 pre-pandemic level by $101. Of occupied housing, owners make up 86.47% (37.64% with a mortgage, 62.36% free-and-clear) and renters 13.53% - making this ZIP Code more home ownership than the state and under national rental averages. The vacancy rate is 8.11%, which is markedly below the national rate (10.43%).
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Home Value | $145,200 | $146,900 | $145,000 | $146,400 | $137,100 | $135,000 | $134,800 | $138,900 | $134,000 | $149,500 | $156,500 | $183,600 | $214,900 |
| Less than $500: | 0 | 0.00% |
| $500 to $999: | 14 | 20.29% |
| $1,000 to $1,499: | 12 | 17.39% |
| $1,500 to $1,999: | 0 | 0.00% |
| $2,000 to $2,499: | 0 | 0.00% |
| $2,500 to $2,999: | 0 | 0.00% |
| $3,000 or more: | 0 | 0.00% |
| No Rent: | 43 | 62.32% |
| Total: | 69 | 100% |
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Rent | $589 | $631 | $600 | $774 | $759 | $852 | $890 | $931 | $889 | $947 | $1,261 | $961 | $990 |
| Owner Occupied (with mortgage): | 166 | 32.55% |
| Owner Occupied (free and clear, no mortgage): | 275 | 53.92% |
| Renter Occupied: | 69 | 13.53% |
| Total Occupied Housing Units: | 510 | 100% |
| Occupied Housing Units: | 510 | 91.89% |
| Vacant Housing Units (not graphed): | 45 | 8.11% |
| Total Housing Units: | 555 | 100% |
| Single-Family Units: | 535 | 96.40% |
| Multi-Family Units: | 4 | 0.72% |
| Other Units: | 16 | 2.88% |
| Total Housing Units: | 555 | 100% |
In 2023, 28.50% of adults (25+) have a bachelor's degree or higher, which is comparable to the national rate (35.00%). High school or higher is 97.90%, which is far higher than the national rate (89.40%). The uninsured rate is 5.60%, which is comparable to the national rate (8.60%). The share of people in poverty is 1.10%, which is far lower than the national rate (8.70%), down 7.60 percentage points since 2011 and below its 2019 pre-pandemic level by 9.80 percentage points. This points to a pronounced improvement in local conditions - rising incomes, firmer consumer demand, and a stronger tax base. Among residents ages 3+, the largest enrollment group is elementary (52.46%). College enrollment is 4.37%, which is markedly below the state rate (27.30%), indicating the community may be more oriented toward vocational/trade or direct-to-workforce opportunities.
Explore More: Educational Attainment Health Insurance Poverty Over Time School Enrollment
| Less than 9th grade: | 0 | 0.00% |
| 9th to 12th grade, no diploma: | 18 | 2.10% |
| High school graduate (includes equivalency): | 475 | 55.49% |
| Some college, no degree: | 66 | 7.71% |
| Associate's degree: | 53 | 6.19% |
| Bachelor's degree: | 171 | 19.98% |
| Graduate or professional degree: | 73 | 8.53% |
| Total: | 856 | 100% |
| High school or higher: | 838 | 97.90% |
| Bachelor's degree or higher: | 244 | 28.50% |
| Private Insurance: | 770 | 62.70% |
| Public Insurance: | 396 | 32.25% |
| No Insurance: | 62 | 5.05% |
| Total: | 1,228 | 100% |
| Has Health Insurance: | 1,166 | 94.95% |
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| % of People in Poverty | 8.7% | 12.2% | 1.7% | 1.7% | 7.5% | 7.0% | 8.9% | 8.2% | 10.9% | 4.3% | 3.6% | 1.5% | 1.1% |
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: | 34 | 18.58% |
| Kindergarten: | 21 | 11.48% |
| Elementary school (grades 1-8): | 96 | 52.46% |
| High school (grades 9-12): | 24 | 13.11% |
| College or graduate school: | 8 | 4.37% |
| Total: | 183 | 100% |
| Early Childhood: | 55 | 30.05% |
| K-12 (Primary & Secondary School): | 141 | 77.05% |
ZIP Code 18631 supports both business and residential activity. According to the Business Census (2024), there are 27 business establishments, employing about 335 people with an annual payroll of $13,435,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 523Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 27Source: CBP |
| 1st Quarter Payroll: | $2,674,000Source: CBP |
| Annual Payroll: | $13,435,000Source: CBP |
| # of Employees: | 335Source: CBP |
ZIP Code 18631 is located in Columbia County, Pennsylvania, within the Bloomsburg-Berwick, PA Metropolitan Statistical Area (CBSA 14100) and Pennsylvania's 9th Congressional District. This Micro area has a population of 65,055 people, about 1.72% of whom live in ZIP Code 18631. It covers 1.422 sq mi of land and a water area of 0.167 sq mi.
| CBSA Name: | Bloomsburg-Berwick, PASource: Census |
| CBSA Number: | 14100Source: Census |
| CBSA Type: | MicroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 65,055Source: Census |
| MSA: | Scranton--Wilkes-Barre--Hazleton, PA MSASource: Census |
| Land Area: | 1.422 sq miSource: Census |
| Water Area: | 0.167 sq miSource: Census |
| Congressional District: | 09Source: USPS |
| Congressional Land Area: | 5730.09 sq miSource: Census |
| PMSA: | --Source: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 4249312Source: Census |
| Place Name: | Mifflinville CDP; PennsylvaniaSource: Census |
We could not locate which school district 18631 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 January 1, 2026.