16159 ZIP Code Profile, Map, Data & Demographics

ZIP Code Type: STANDARD
County: Mercer County
Centroid: Latitude 41.185, Longitude -80.455
Time Zone: Eastern Time Zone (UTC -5 hours)
Observes DST: Yes

ZIP Code 16159 has segments in 2 Counties (Lawrence, Mercer).

Businesses Addresses: 137
PO Box Addresses: 188
Residential Addresses: 1,752

Multi-Family Addresses: 181
Single Family Addresses: 1,571

The ZIP Code maps and database are updated 4 times per year.
Database updated: June 1, 2025, Maps updated: May 1, 2024.

West Middlesex, PA 16159 Data & Demographics (As of July 1, 2025)

POPULATION
Total Population	3,995 (100%)
Population in Households	3,995 (100.0%)
Population in Families	3,271 (81.9%)
Population in Group Quarters¹	0
Population Density	153
Diversity Index²	16


INCOME
Median Household Income	$74,332
Average Household Income	$84,951
% of Income for Mortgage⁴	16%
Per Capita Income	$37,064
Wealth Index⁵	65
Socioeconomic Status Index⁶	Moderate (52.9)

HOUSING
Total HU (Housing Units)	1,920 (100%)
Owner Occupied HU	1,448 (75.4%)
Renter Occupied HU	295 (15.4%)
Vacant Housing Units	177 ( 9.2%)
Median Home Value	$187,774
Average Home Value	$252,978
Housing Affordability Index³	140

HOUSEHOLDS
Total Households	1,743
Average Household Size	2.29
Family Households	1,143
Average Family Size	3.00

NOTES

Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different races or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.
The Socioeconomic Index ranges from zero (lowest relative status) to 100 (highest relative status). This measure quantifies disparities in social position of an area's inhabitants and is built from a broad range of demographic, housing, and socioeconomic inputs. More information on this measure can be found in Esri's SEI tutorial.

West Middlesex, PA 16159 - Peer Comparisons by Rank and Percentile

The table below compares 16159 to the other 1,696 ZIP Codes in Pennsylvania by rank and percentile using July 1, 2025 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

GROWTH RATE / YEAR	2020-2025	2025-2030
Population	-0.34%	-0.30%
Households	-0.22%	-0.28%
Families		0.02%
Median Household Income		1.72%
Per Capita Income		1.57%
Owner Occupied HU		0.00%

Variable Description	Rank	Percentile
Total Population	# 712	58th
Population Density	# 997	41st
Median Household Income	# 740	56th
Housing Affordability Index	# 1437	85th
Per Capita Income	# 842	50th
Diversity Index	# 978	42nd

16159 ZIP Code Profile, Map, Data & Demographics

ZIP Code 16159: Basic Data & USPS Preferred City Name

West Middlesex, PA 16159 Data & Demographics (As of July 1, 2025)

POPULATION

INCOME

HOUSING

HOUSEHOLDS

GROWTH RATE / YEAR

West Middlesex, PA 16159 - Peer Comparisons by Rank and Percentile

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