Residential delivery area · Pennsylvania
ZIP Code 18031: Breinigsville, PA
ZIP code 18031 uses the postal name Breinigsville, Pennsylvania and lies mostly in Lehigh County (99% of its land) with the rest in Berks County (Census 2020 ZIP-county file). About 12,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $113,625 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Breinigsville (24%) and Trexlertown (6%); 70% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Breinigsville · its only residential ZIP
- County
- Lehigh County (99%); Berks County (1%)
- Census places
- Breinigsville (24%) census-designated place; Trexlertown (6%) census-designated place
- Metro area
- Allentown-Bethlehem-Easton, PA-NJ
- House districts
- PA-7 (99%), PA-4 (1%) 119th Congress, by share of land
- State
- Pennsylvania
- Time zone
- Eastern
- Land area
- 13.9 sq mi · 831 people per sq mi
Where is ZIP code 18031?
18031 centers on 40.560°, -75.649° and covers 13.9 square miles of land plus 0.0 of water. It borders 7 ZIP codes: 18051, 18087, 18106, 19539, 18062, 18011, 19530.
The map draws ZIP code areas only. For the streets inside 18031, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 18031 compare with the rest of Lehigh County?
| Measure | 18031 | In Lehigh County | In PA |
|---|---|---|---|
| People (ACS 2020-2024) | 11,570 | 13th of 35 | 371st of 1,833 |
| Median household income | $114k | 6th of 27 | 116th of 1,015 |
| Median home value | $373k | 10th of 28 | 142nd of 1,069 |
Its median household income is higher than in 88% of U.S. residential ZIP codes, and it is denser than 77% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 18031?
The 2020 Census counted 11,369 people in 18031; the ACS, which samples households over 2020-2024, estimates 11,570. Between the 2010 and 2020 censuses its population grew 51.0% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 11,570
- 2020 Census count
- 11,369+51.0% since 2010 (7,528)
- Households
- 4,098
- Median age
- 39.4
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 18031?
Of the 11,570 people the ACS estimates in 18031, 26.6% are under 18 and 15.2% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (60.9%), then Hispanic or Latino (17.8%).
- Under 1826.6%
- 18 to 6458.3%
- 65 and older15.2%
- White, not Hispanic60.9%
- Hispanic or Latino17.8%
- Asian, not Hispanic13.6%
- Black, not Hispanic5.1%
- Other or two or more2.5%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 18031 earn?
Median household income is $113,625 (ACS 2020-2024), the 6th highest of the 27 ranked ZIP codes in Lehigh County. It is not measurably different from 2015-2019 ($113,697 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $113,625±$18,149
- Income per person
- $57,645
- Below the poverty line
- 3.7%
- Unemployed (of the labor force)
- 2.8%
- Adults 25+ with a bachelor's degree
- 53.5%
- Adjusted gross income per tax return, 2022
- $103,8695,730 returns; wages 78% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 18031?
FHFA's house price index for 18031, built from repeat sales and appraisals of the same homes, rose 66% from 2015 to 2025 and rose 46% from 2020 to 2025, and moved −3.5% in 2025.
- Median home value (owners' estimate)
- $373,400
- Median gross rent
- $1,949
- Homes owned by their occupants
- 76.3%
- Housing units
- 4,634
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 18031?
214 business establishments had a location in this ZIP code in 2023, 7 more than in 2018; the most are in transportation and warehousing (ZIP Code Business Patterns).
- Transportation and warehousing46
- Professional, scientific, and technical services28
- Wholesale trade19
- Administrative and support and waste management and remediation services17
- Manufacturing16
- Retail trade16
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 18031?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 18051 | Fogelsville | 3,624 | $140k | 2.7 mi |
| 18087 | Trexlertown | 590 | $73k | 2.9 mi |
| 18106 | Allentown | 6,226 | $93k | 4.4 mi |
| 19539 | Mertztown | 3,823 | $108k | 4.7 mi |
| 18062 | Macungie | 27,110 | $111k | 5.2 mi |
| 18011 | Alburtis | 5,338 | $104k | 5.7 mi |
| 19530 | Kutztown | 15,573 | $72k | 7.1 mi |
| 18195 | Allentown | 0 | – | 2.1 mi (near) |
| 19538 | Maxatawny | 64 | $49k | 2.9 mi (near) |
| 18046 | East Texas | 201 | – | 4.7 mi (near) |
| 19562 | Topton | 2,947 | $80k | 4.8 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.