80504 ZIP Code, Longmont, CO

80504 is a ZIP code in Longmont, Colorado — mostly in Weld County (59% of its land), with smaller parts in Boulder County. It covers 95 square miles of land. The closest ZIP codes are 80501, 80542 and 80520. 63,451 people live here in 24,077 households, which puts it among the most populous 1% of Colorado ZIP codes. With about 671 people per square mile it is lightly settled, and most homes are owner-occupied (79%). Median household income is $113,643, above the Colorado median of $95,470.

Quick facts

Key figures

MeasureValue
Residents63,451
Households24,077
Median household income$113,643
Income per person$52,586
Median age39.5
Homeowners79.1%
Median home value$591,700
Median rent$1,996
Bachelor's degree or higher44.7%
Average commute (minutes)28.5
Households with kids under 1830.8%
Moved in the past year11.5%
Below the poverty line5.0%
Broadband internet96.2%
Speak a non-English language at home16.9%

Household income

% of householdsValue
<$10K1.6%
$10–15K1.5%
$15–25K4.1%
$25–35K3.2%
$35–50K6.6%
$50–75K12.0%
$75–100K13.3%
$100–150K23.4%
$150–200K15.5%
$200K+18.7%

Age

% of all residentsValue
<1011.1%
10–1912.6%
20–245.8%
25–3413.9%
35–4414.0%
45–5413.2%
55–6413.2%
65–7410.9%
75+5.3%

Tenure

% of housing unitsValue
Owned, with mortgage56.0%
Owned outright21.5%
Rented20.3%
Vacant2.2%

Type of building

% of housing unitsValue
Detached house74.6%
Townhome6.2%
2–4 units1.8%
5–19 units7.9%
20+ units5.4%
Mobile / other4.1%

Businesses in 80504

1,192 business establishments with 14,517 employees (ZIP Codes Business Patterns 2023).

EDDM carrier routes

80504 has 39 USPS carrier routes with 25,785 residential and 965 business mailboxes. Open the EDDM route map.

Carrier routes in 80504

80504 has 39 USPS carrier routes (8 city (C), 31 rural (R)) with 25,785 residential and 965 business mailboxes. Routes range from 369 homes (C079) to 1,166 homes (R047); the median route has 639 homes. The Census counted 24,077 households in 80504 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per routeRoutes
1–2490
250–4997
500–74922
750–9997
1,000–1,4993
1,500+0

Best routes in 80504 for…

Most businesses

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

  1. Route R013 — USPS business mailboxes 152, 552 homes
  2. Route R023 — USPS business mailboxes 139, 650 homes
  3. Route R045 — USPS business mailboxes 131, 544 homes
  4. Route R001 — USPS business mailboxes 122, 521 homes
  5. Route R040 — USPS business mailboxes 62, 645 homes

Select these 5 routes on the route map

Every carrier route in 80504

RouteTypeHomesBusinessesEst. median incomeEst. ownersEst. families with kidsEst. moved in past year
C065City4200$72,750———
C070City66716$104,022———
C072City4453$92,931———
C076City4874$89,152———
C079City3691$104,022———
C081City5510$103,500———
C086City49517$86,438———
C095City6941$86,438———
R001Rural521122$118,751———
R002Rural4865$200,001+———
R004Rural77014$112,924———
R006Rural53012$128,897———
R010Rural4300$168,503———
R011Rural5847$156,603———
R013Rural552152$101,090———
R015Rural7141$128,897———
R020Rural9763$101,090———
R021Rural80240$119,428———
R023Rural650139$92,625———
R026Rural8385$123,888———
R027Rural81159$145,960———
R029Rural53647$156,603———
R032Rural6350$116,225———
R033Rural5432$119,428———
R034Rural6994$115,983———
R035Rural7031$103,500———
R037Rural5760$155,007———
R038Rural8981$168,503———
R040Rural64562$115,983———
R041Rural59228$115,983———
R043Rural63934$145,960———
R044Rural7180$124,378———
R045Rural544131$176,034———
R046Rural7783$102,764———
R047Rural1,16612$145,960———
R050Rural6932$124,378———
R052Rural1,0171$128,897———
R054Rural5491$102,764———
R055Rural1,06235$102,764———

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 80504 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

Areas that include 80504

Where it ranks

Mail every home in 80504

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) 80504, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 80504 in?
80504 is a Longmont, CO mailing address. By land area, 13% lies inside Firestone, 11% lies inside Longmont, 7% lies inside Frederick and 4% lies inside Mead; the rest is outside any Census-defined city or community.
What county is 80504 in?
80504 is mostly in Weld County (59% of its land), with smaller parts in Boulder County.
What is the population of 80504?
About 63,451 people (±1,966), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 60,183.
What is the median household income in 80504?
$113,643 (±$4,548), compared with $95,470 for Colorado as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 80504?
39 USPS carrier routes with 25,785 residential and 965 business mailboxes (26,804 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 80504?
The closest, measured center to center: 80501 (3.8 mi, Longmont), 80542 (5 mi, Mead), 80520 (6.2 mi, Firestone), 80530 (7.1 mi, Frederick), 80514 (7.6 mi, Dacono) and 80516 (7.8 mi, Erie).

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