What city is 18031 in?

18031 is a Breinigsville, PA mailing address. By land area, 24% lies inside Breinigsville and 6% lies inside Trexlertown; the rest is outside any Census-defined city or community.

What is the population of 18031?

About 11,570 people (±983), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 11,369.

What is the median household income in 18031?

$113,625 (±$18,149), compared with $77,971 for Pennsylvania as a whole. Half the households in the ZIP code earn more and half earn less.

How many carrier routes and mailboxes are in 18031?

7 USPS carrier routes with 4,829 residential and 124 business mailboxes (4,953 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 18031?

The closest, measured center to center: 18195 (2.1 mi), 18051 (2.7 mi), 18087 (2.9 mi, Trexlertown), 19538 (2.9 mi, Maxatawny), 18106 (4.4 mi, Wescosville) and 18046 (4.7 mi).

18031 ZIP Code, Breinigsville, PA

18031 is a ZIP code in Breinigsville, Pennsylvania in Lehigh County. It covers 14 square miles of land. The closest ZIP codes are 18195, 18051 and 18087. 11,570 people live here in 4,098 households. With about 831 people per square mile it is lightly settled, and most homes are owner-occupied (76%). Median household income is $113,625, above the Pennsylvania median of $77,971.

Quick facts

Mailing city: Breinigsville, PA
County: Lehigh County
Land area: 14 sq mi
Population: 11,570
Median household income: $113,625
Carrier routes: 7 (4,829 homes)

Key figures

Measure	Value
Residents	11,570
Households	4,098
Median household income	$113,625
Income per person	$57,645
Median age	39.4
Homeowners	76.3%
Median home value	$373,400
Median rent	$1,949
Bachelor's degree or higher	53.5%
Average commute (minutes)	24
Households with kids under 18	34.6%
Moved in the past year	17.4%
Below the poverty line	3.7%
Broadband internet	98.5%
Speak a non-English language at home	21.3%

Household income

% of households	Value
<$10K	1.3%
$10–15K	0.8%
$15–25K	1.6%
$25–35K	1.7%
$35–50K	3.5%
$50–75K	15.6%
$75–100K	17.8%
$100–150K	24.3%
$150–200K	9.9%
$200K+	23.5%

Age

% of all residents	Value
<10	11.6%
10–19	16.4%
20–24	2.5%
25–34	12.7%
35–44	16.3%
45–54	12.3%
55–64	13.0%
65–74	9.3%
75+	5.8%

Tenure

% of housing units	Value
Owned, with mortgage	49.7%
Owned outright	18.7%
Rented	20.4%
Vacant	11.3%

Type of building

% of housing units	Value
Detached house	40.9%
Townhome	37.0%
2–4 units	0.5%
5–19 units	9.2%
20+ units	4.3%
Mobile / other	8.1%

Businesses in 18031

214 business establishments with 16,516 employees (ZIP Codes Business Patterns 2023).

Transportation and Warehousing: 46
Professional, Scientific, and Technical Services: 28
Wholesale Trade: 19
Administrative and Support and Waste Management and Remediation Services: 17
Manufacturing: 16
Retail Trade: 16
Health Care and Social Assistance: 16
Other Services (except Public Administration): 15

EDDM carrier routes

18031 has 7 USPS carrier routes with 4,829 residential and 124 business mailboxes. Open the EDDM route map.

Carrier routes in 18031

18031 has 7 USPS carrier routes (7 rural (R)) with 4,829 residential and 124 business mailboxes. Routes range from 450 homes (R024) to 1,012 homes (R020); the median route has 697 homes. The Census counted 4,098 households in 18031 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	0
250–499	1
500–749	3
750–999	2
1,000–1,499	1
1,500+	0

Best routes in 18031 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

Route R021 — USPS business mailboxes 35, 524 homes
Route R019 — USPS business mailboxes 34, 569 homes
Route R020 — USPS business mailboxes 26, 1,012 homes
Route R022 — USPS business mailboxes 18, 697 homes
Route R018 — USPS business mailboxes 9, 781 homes

Select these 5 routes on the route map

Every carrier route in 18031

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
R018	Rural	781	9	$160,965	—	—	—
R019	Rural	569	34	$153,431	—	—	—
R020	Rural	1,012	26	$69,886	—	—	—
R021	Rural	524	35	$114,036	—	—	—
R022	Rural	697	18	$89,570	—	—	—
R023	Rural	796	2	$153,431	—	—	—
R024	Rural	450	0	$69,886	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 18031 on the EDDM route map.

How route demographics are estimated

Mailbox counts come from USPS; demographics are estimates

The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).

How a route gets its figures: the block-group length-share method

We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.

Margins of error

Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.

Different years

USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.

Why some routes show identical figures

Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.

Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Nearby ZIP codes

18195 (2.1 mi)
18051 (2.7 mi)
18087 — Trexlertown CDP, PA (2.9 mi)
19538 — Maxatawny CDP, PA (2.9 mi)
18106 — Wescosville CDP, PA (4.4 mi)
18046 (4.7 mi)
19539 — Mertztown CDP, PA (4.7 mi)
19562 — Topton borough, PA (4.8 mi)

Areas that include 18031

Breinigsville, PA ZIP codes — 1 ZIP code
Trexlertown, PA ZIP codes — 3 ZIP codes
Lehigh County ZIP codes — 32 ZIP codes
Pennsylvania ZIP code data

Where it ranks

Mail every home in 18031

Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.

EDDM guides

ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 18031, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 18031 in?: 18031 is a Breinigsville, PA mailing address. By land area, 24% lies inside Breinigsville and 6% lies inside Trexlertown; the rest is outside any Census-defined city or community.
What county is 18031 in?: 18031 is in Lehigh County.
What is the population of 18031?: About 11,570 people (±983), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 11,369.
What is the median household income in 18031?: $113,625 (±$18,149), compared with $77,971 for Pennsylvania as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 18031?: 7 USPS carrier routes with 4,829 residential and 124 business mailboxes (4,953 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 18031?: The closest, measured center to center: 18195 (2.1 mi), 18051 (2.7 mi), 18087 (2.9 mi, Trexlertown), 19538 (2.9 mi, Maxatawny), 18106 (4.4 mi, Wescosville) and 18046 (4.7 mi).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.