ZIP Code Tabulation Area · Pennsylvania

ZIP Code 18631: Mifflinville, PA

ZIP Code 18631 (Mifflinville, Columbia County, Pennsylvania) has an estimated 1,100 residents in 517 households. The median household income is $46,125, the median home value is $214,100 and the median gross rent is $959/mo. Figures are U.S. Census Bureau American Community Survey 2020–2024 5-year estimates for the matching ZIP Code Tabulation Area.

American Community Survey 2020–2024 5-year estimates · Updated Oct 26, 2026

Some estimates have a large margin of error. One figure for this ZIP (bachelor's or higher) is marked with *. ACS figures come from a sample, and small areas have fewer responses, so treat these numbers as rough ranges.

Total population

1,100

Margin of error ±289

Median household income

$46,125

Margin of error ±$17,333

Median home value

$214,100

Margin of error ±$8,406

Median gross rent

$959/mo

Margin of error ±$241

Median age

47.0 yrs

Margin of error ±8.1 yrs

Mean travel time to work

21.3 min

Margin of error ±10.1 min

How ZIP 18631 compares with Pennsylvania and the U.S.

State and national figures are the Census Bureau's own estimates for those areas from the same ACS release, not averages of ZIP codes.

Median age

ZIP 1863147.0 yrsPennsylvania40.9 yrsUnited States38.9 yrs

Median household income

ZIP 18631$46,125Pennsylvania$77,971United States$80,734

Per capita income

ZIP 18631$29,601Pennsylvania$44,355United States$44,673

Poverty rate

ZIP 1863114.2%Pennsylvania11.7%United States12.5%

Unemployment rate

ZIP 186310.0%Pennsylvania5.3%United States5.2%

Bachelor's degree or higher

ZIP 1863129.6%*Pennsylvania35.2%United States35.7%

Median home value

ZIP 18631$214,100Pennsylvania$254,500United States$332,700

Median gross rent

ZIP 18631$959/moPennsylvania$1,209/moUnited States$1,413/mo

Owner-occupied homes

ZIP 1863178.3%Pennsylvania69.3%United States65.2%

Mean travel time to work

ZIP 1863121.3 minPennsylvania26.3 minUnited States26.4 min

Worked from home

ZIP 1863115.8%Pennsylvania15.6%United States15.1%

All figures for ZIP 18631

Each estimate has a 90% margin of error: the true value is likely within that range. * marks estimates with a large margin of error (a coefficient of variation above 30%, or ±10 percentage points or more for rates).

ZIP 18631 — ACS 2020–2024 5-year estimates
Measure	ZIP 18631	Margin of error	Pennsylvania	United States
Total population	1,100	±289	13,018,639	334,922,499
Median age	47.0 yrs	±8.1 yrs	40.9 yrs	38.9 yrs
Households	517	±116	5,274,853	129,227,496
Median household income	$46,125	±$17,333	$77,971	$80,734
Per capita income	$29,601	±$4,323	$44,355	$44,673
Poverty rate	14.2%	±6.6 pts	11.7%	12.5%
Unemployment rate	0.0%	±2.4 pts	5.3%	5.2%
Bachelor's degree or higher	29.6%*	±14.7 pts	35.2%	35.7%
Median home value	$214,100	±$8,406	$254,500	$332,700
Median gross rent	$959/mo	±$241	$1,209/mo	$1,413/mo
Owner-occupied homes	78.3%	±9.8 pts	69.3%	65.2%
Mean travel time to work	21.3 min	±10.1 min	26.3 min	26.4 min
Worked from home	15.8%	±8.3 pts	15.6%	15.1%

Race and Hispanic or Latino origin

Shares of the total population by the Census Bureau's race and Hispanic or Latino origin categories (table B03002), listed in the Census Bureau's order. People self-identify on the survey.

Population by race and Hispanic or Latino origin, ZIP 18631
Group	ZIP 18631	Pennsylvania	United States
White alone, not Hispanic or Latino	95.3%	73.0%	57.4%
Black or African American alone, not Hispanic or Latino	1.5%	10.3%	11.9%
American Indian and Alaska Native alone, not Hispanic or Latino	0.0%	0.1%	0.5%
Asian alone, not Hispanic or Latino	0.0%	3.8%	5.9%
Native Hawaiian and Other Pacific Islander alone, not Hispanic or Latino	0.0%	0.0%	0.2%
Some other race alone, not Hispanic or Latino	0.0%	0.5%	0.6%
Two or more races, not Hispanic or Latino	0.0%	3.6%	4.3%
Hispanic or Latino (of any race)	3.2%	8.7%	19.3%

Where ZIP 18631 is

State: Pennsylvania
Main county: Columbia County
Largest overlapping place: Mifflinville (89% of the ZIP's land area)
Land area: 1.42 sq mi· about 775 people per sq mi

County and place names come from the Census Bureau's 2020 ZCTA relationship files. A ZIP code's mailing city, set by the U.S. Postal Service, can differ from these names.

Other ZIP codes in Columbia County

17814 Columbia County, PA 17815 Columbia County, PA 17820 Columbia County, PA 17824 Columbia County, PA 17846 Columbia County, PA 17858 Columbia County, PA 17859 Columbia County, PA 17878 Columbia County, PA 17888 Columbia County, PA 17920 Columbia County, PA 17945 Columbia County, PA 18603 Columbia County, PA

See every ZIP code in Pennsylvania, or compare ZIP 18631 with another ZIP code.

Census figures describe residents as a group and cannot tell you about any one home or street. For a specific address, check local government and housing records.

About ZIP codes and ZCTAs: the Census Bureau publishes statistics for ZIP Code Tabulation Areas, which approximate USPS ZIP code delivery areas. Learn how they differ.

Sources

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, detailed tables B01003, B01002, B11001, B19013, B19301, B17001, B23025, B15003, B25077, B25064, B25003, B08013, B08303, B08301, B03002 — snapshot Oct 26, 2026.
U.S. Census Bureau, 2020 ZCTA5 relationship files (county and place).
Data: U.S. Census Bureau, American Community Survey 5-year estimates (detailed tables) and 2020 Census ZCTA relationship files. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau. These agencies do not endorse OpenZIP.