18951 ZIP Code, Quakertown, PA
18951 is a ZIP code in Quakertown, Pennsylvania in Bucks County. It covers 72 square miles of land. The closest ZIP codes are 18955, 18935 and 18970. 36,568 people live here in 14,202 households, more than in 9 of every 10 Pennsylvania ZIP codes. With about 510 people per square mile it is lightly settled, and most homes are owner-occupied (82%). Median household income is $98,268, above the Pennsylvania median of $77,971.
Quick facts
- Mailing city: Quakertown, PA
- County: Bucks County
- Land area: 72 sq mi
- Population: 36,568
- Median household income: $98,268
- Carrier routes: 27 (14,455 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 36,568 |
| Households | 14,202 |
| Median household income | $98,268 |
| Income per person | $46,855 |
| Median age | 44.2 |
| Homeowners | 82.0% |
| Median home value | $363,200 |
| Median rent | $1,441 |
| Bachelor's degree or higher | 32.5% |
| Average commute (minutes) | 28.3 |
| Households with kids under 18 | 30.2% |
| Moved in the past year | 8.0% |
| Below the poverty line | 6.2% |
| Broadband internet | 92.7% |
| Speak a non-English language at home | 10.6% |
Household income
| % of households | Value |
|---|---|
| <$10K | 2.0% |
| $10–15K | 1.5% |
| $15–25K | 4.2% |
| $25–35K | 5.0% |
| $35–50K | 9.2% |
| $50–75K | 18.2% |
| $75–100K | 10.9% |
| $100–150K | 21.3% |
| $150–200K | 13.8% |
| $200K+ | 13.9% |
Age
| % of all residents | Value |
|---|---|
| <10 | 9.4% |
| 10–19 | 13.6% |
| 20–24 | 4.9% |
| 25–34 | 10.6% |
| 35–44 | 12.6% |
| 45–54 | 15.1% |
| 55–64 | 14.1% |
| 65–74 | 12.5% |
| 75+ | 7.3% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 54.4% |
| Owned outright | 24.5% |
| Rented | 16.7% |
| Vacant | 4.4% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 58.7% |
| Townhome | 23.3% |
| 2–4 units | 4.0% |
| 5–19 units | 5.3% |
| 20+ units | 3.3% |
| Mobile / other | 5.4% |
Businesses in 18951
1,015 business establishments with 15,471 employees (ZIP Codes Business Patterns 2023).
- Retail Trade: 159
- Health Care and Social Assistance: 122
- Construction: 118
- Other Services (except Public Administration): 116
- Accommodation and Food Services: 95
- Professional, Scientific, and Technical Services: 88
- Manufacturing: 67
- Administrative and Support and Waste Management and Remediation Services: 64
EDDM carrier routes
18951 has 27 USPS carrier routes with 14,455 residential and 931 business mailboxes. Open the EDDM route map.
Carrier routes in 18951
18951 has 27 USPS carrier routes (15 city (C), 9 rural (R), 3 highway contract (H)) with 14,455 residential and 931 business mailboxes. Routes range from 114 homes (H002) to 844 homes (C025); the median route has 554 homes. The Census counted 14,202 households in 18951 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 2 |
| 250–499 | 8 |
| 500–749 | 15 |
| 750–999 | 2 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 18951 for…
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route C004 — USPS business mailboxes 162, 578 homes
- Route C002 — USPS business mailboxes 112, 462 homes
- Route C005 — USPS business mailboxes 91, 568 homes
- Route C008 — USPS business mailboxes 80, 646 homes
- Route C011 — USPS business mailboxes 77, 630 homes
Select these 5 routes on the route map
Every carrier route in 18951
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C001 | City | 460 | 43 | $91,596 | — | — | — |
| C002 | City | 462 | 112 | $75,925 | — | — | — |
| C003 | City | 554 | 16 | $83,522 | — | — | — |
| C004 | City | 578 | 162 | $103,472 | — | — | — |
| C005 | City | 568 | 91 | $59,606 | — | — | — |
| C006 | City | 590 | 40 | $68,166 | — | — | — |
| C007 | City | 672 | 22 | $44,585 | — | — | — |
| C008 | City | 646 | 80 | $77,888 | — | — | — |
| C010 | City | 476 | 20 | $102,379 | — | — | — |
| C011 | City | 630 | 77 | $142,648 | — | — | — |
| C012 | City | 614 | 12 | $115,072 | — | — | — |
| C013 | City | 751 | 20 | $91,596 | — | — | — |
| C015 | City | 555 | 51 | $109,740 | — | — | — |
| C025 | City | 844 | 18 | $115,976 | — | — | — |
| C026 | City | 554 | 41 | $68,166 | — | — | — |
| H001 | Highway contract | 736 | 36 | $127,178 | — | — | — |
| H002 | Highway contract | 114 | 11 | $101,718 | — | — | — |
| H003 | Highway contract | 163 | 0 | $176,986 | — | — | — |
| R001 | Rural | 530 | 14 | $85,879 | — | — | — |
| R002 | Rural | 494 | 13 | $127,178 | — | — | — |
| R003 | Rural | 456 | 17 | $69,818 | — | — | — |
| R004 | Rural | 497 | 4 | $81,289 | — | — | — |
| R005 | Rural | 509 | 13 | $86,948 | — | — | — |
| R006 | Rural | 456 | 5 | $69,818 | — | — | — |
| R007 | Rural | 547 | 3 | $79,010 | — | — | — |
| R008 | Rural | 626 | 10 | $89,544 | — | — | — |
| R009 | Rural | 373 | 0 | $79,010 | — | — | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 18951 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
- 18955 — Richlandtown borough, PA (2.5 mi)
- 18935 — Milford Square CDP, PA (3.1 mi)
- 18970 — Trumbauersville borough, PA (3.7 mi)
- 18036 — Coopersburg borough, PA (4.1 mi)
- 18960 — Sellersville borough, PA (6.5 mi)
- 18034 — DeSales University CDP, PA (6.8 mi)
- 18944 — Perkasie borough, PA (7.5 mi)
- 18081 (8 mi)
Areas that include 18951
- Quakertown, PA ZIP codes — 1 ZIP code
- Spinnerstown, PA ZIP codes — 1 ZIP code
- Milford Square, PA ZIP codes — 2 ZIP codes
- Trumbauersville, PA ZIP codes — 2 ZIP codes
- Bucks County ZIP codes — 54 ZIP codes
- Pennsylvania ZIP code data
Mail every home in 18951
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) 18951, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 18951 in?
- 18951 is a Quakertown, PA mailing address. By land area, 3% lies inside Quakertown and 3% lies inside Spinnerstown; the rest is outside any Census-defined city or community.
- What county is 18951 in?
- 18951 is in Bucks County.
- What is the population of 18951?
- About 36,568 people (±899), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 36,111.
- What is the median household income in 18951?
- $98,268 (±$6,699), 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 18951?
- 27 USPS carrier routes with 14,455 residential and 931 business mailboxes (15,386 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 18951?
- The closest, measured center to center: 18955 (2.5 mi, Richlandtown borough, PA), 18935 (3.1 mi, Milford Square), 18970 (3.7 mi, Trumbauersville borough, PA), 18036 (4.1 mi, Coopersburg borough, PA), 18960 (6.5 mi, Sellersville borough, PA) and 18034 (6.8 mi, DeSales University).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.