77521 ZIP Code, Baytown, TX
77521 is a ZIP code in Baytown, Texas — mostly in Harris County (77% of its land), with smaller parts in Chambers County. It covers 49 square miles of land, centered about 25 miles east of downtown Houston. The closest ZIP codes are 77562, 77520 and 77580. 69,038 people live here in 24,321 households, more than in 9 of every 10 Texas ZIP codes. At about 1,401 people per square mile it has suburban density, and owners and renters are mixed (58% own). Median household income is $73,629, close to the Texas median of $78,476.
Quick facts
- Mailing city: Baytown, TX
- County: Harris County
- Metro area: Houston
- Land area: 49 sq mi
- Population: 69,038
- Median household income: $73,629
- Carrier routes: 34 (26,860 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 69,038 |
| Households | 24,321 |
| Median household income | $73,629 |
| Income per person | $32,886 |
| Median age | 32.9 |
| Homeowners | 58.2% |
| Median home value | $231,400 |
| Median rent | $1,390 |
| Bachelor's degree or higher | 16.9% |
| Average commute (minutes) | 25.2 |
| Households with kids under 18 | 39.3% |
| Moved in the past year | 15.4% |
| Below the poverty line | 15.4% |
| Broadband internet | 93.4% |
| Speak a non-English language at home | 41.9% |
Household income
| % of households | Value |
|---|---|
| <$10K | 5.5% |
| $10–15K | 3.9% |
| $15–25K | 6.0% |
| $25–35K | 8.5% |
| $35–50K | 9.9% |
| $50–75K | 16.9% |
| $75–100K | 14.6% |
| $100–150K | 17.7% |
| $150–200K | 10.2% |
| $200K+ | 6.8% |
Age
| % of all residents | Value |
|---|---|
| <10 | 15.2% |
| 10–19 | 15.7% |
| 20–24 | 6.9% |
| 25–34 | 16.4% |
| 35–44 | 14.0% |
| 45–54 | 11.5% |
| 55–64 | 9.9% |
| 65–74 | 6.4% |
| 75+ | 3.9% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 31.0% |
| Owned outright | 23.7% |
| Rented | 39.3% |
| Vacant | 6.0% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 60.9% |
| Townhome | 2.2% |
| 2–4 units | 2.7% |
| 5–19 units | 15.7% |
| 20+ units | 11.1% |
| Mobile / other | 7.3% |
Businesses in 77521
908 business establishments with 17,772 employees (ZIP Codes Business Patterns 2023).
- Health Care and Social Assistance: 170
- Retail Trade: 166
- Accommodation and Food Services: 119
- Other Services (except Public Administration): 94
- Finance and Insurance: 67
- Professional, Scientific, and Technical Services: 61
- Real Estate and Rental and Leasing: 46
- Construction: 39
EDDM carrier routes
77521 has 34 USPS carrier routes with 26,860 residential and 1,231 business mailboxes. Open the EDDM route map.
Carrier routes in 77521
77521 has 34 USPS carrier routes (19 city (C), 15 rural (R)) with 26,860 residential and 1,231 business mailboxes. Routes range from 480 homes (C001) to 1,450 homes (C043); the median route has 751 homes. The Census counted 24,321 households in 77521 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 0 |
| 250–499 | 2 |
| 500–749 | 15 |
| 750–999 | 13 |
| 1,000–1,499 | 4 |
| 1,500+ | 0 |
Best routes in 77521 for…
Highest income
For bigger-ticket offers: remodeling, pools, financial planning, private schools.
- Route R030 — Est. median household income $119,096, 779 homes
- Route C034 — Est. median household income $111,950, 643 homes
- Route C032 — Est. median household income $110,156, 528 homes
- Route R023 — Est. median household income $107,809, 927 homes
- Route R025 — Est. median household income $107,781, 651 homes
Select these 5 routes on the route map
Often mailed by: Home services EDDM, Real estate EDDM postcards, Landscaping and lawn care mailers
Most families with kids
For tutoring, youth sports, pediatric dental, child care and family dining.
- Route C031 — Est. families with children under 18 50.1%, 862 homes
- Route R025 — Est. families with children under 18 49.6%, 651 homes
- Route C004 — Est. families with children under 18 47.8%, 619 homes
- Route R015 — Est. families with children under 18 47.3%, 955 homes
- Route C040 — Est. families with children under 18 47.1%, 890 homes
Select these 5 routes on the route map
Often mailed by: Dental practice EDDM, Healthcare and clinic mailers
Most homeowners
Owners decide on roofs, HVAC, lawns, solar and insurance; renters usually can't.
- Route R016 — Est. owner-occupied homes 96.2%, 835 homes
- Route C034 — Est. owner-occupied homes 94.9%, 643 homes
- Route R025 — Est. owner-occupied homes 88.5%, 651 homes
- Route R001 — Est. owner-occupied homes 86.6%, 753 homes
- Route R010 — Est. owner-occupied homes 83.8%, 729 homes
Select these 5 routes on the route map
Often mailed by: Roofing direct mail, HVAC postcards
Most new movers
New residents are still choosing a dentist, a gym and a lawn service.
- Route C040 — Est. residents who moved in the past year 34.2%, 890 homes
- Route C021 — Est. residents who moved in the past year 32.8%, 480 homes
- Route C001 — Est. residents who moved in the past year 26.6%, 480 homes
- Route C004 — Est. residents who moved in the past year 24.6%, 619 homes
- Route C043 — Est. residents who moved in the past year 22.9%, 1,450 homes
Select these 5 routes on the route map
Often mailed by: Restaurant EDDM menus and offers, Gym and fitness mailers
Newest homes
Newer subdivisions: landscaping, window treatments, fencing, security, home warranties.
- Route R023 — Est. homes built 2010 or later 52.6%, 927 homes
- Route R025 — Est. homes built 2010 or later 51.5%, 651 homes
- Route R015 — Est. homes built 2010 or later 48.4%, 955 homes
- Route R007 — Est. homes built 2010 or later 48.1%, 879 homes
- Route R021 — Est. homes built 2010 or later 45.3%, 578 homes
Select these 5 routes on the route map
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route R008 — USPS business mailboxes 200, 606 homes
- Route C001 — USPS business mailboxes 191, 480 homes
- Route C003 — USPS business mailboxes 141, 788 homes
- Route C004 — USPS business mailboxes 127, 619 homes
- Route C040 — USPS business mailboxes 70, 890 homes
Select these 5 routes on the route map
Every carrier route in 77521
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C001 | City | 480 | 191 | $51,421 | 34.4% | 24.9% | 26.6% |
| C002 | City | 720 | 29 | $51,790 | 47.9% | 39.3% | 16.1% |
| C003 | City | 788 | 141 | $49,548 | 37.7% | 28.3% | 22.8% |
| C004 | City | 619 | 127 | $63,133 | 47.4% | 47.8% | 24.6% |
| C005 | City | 652 | 10 | $58,984 | 54.6% | 39.1% | 5.8% |
| C006 | City | 817 | 20 | $77,822 | 65.8% | 46.3% | 11.0% |
| C007 | City | 885 | 25 | $69,635 | 73.9% | 30.6% | 10.6% |
| C010 | City | 1,112 | 15 | $51,223 | 59.6% | 42.7% | 11.5% |
| C021 | City | 480 | 0 | $87,853 | 52.9% | 26.4% | 32.8% |
| C023 | City | 744 | 2 | $49,536 | 61.1% | 42.6% | 16.1% |
| C027 | City | 968 | 54 | $61,390 | 27.2% | 40.6% | 16.5% |
| C028 | City | 749 | 49 | $54,518 | 43.5% | 38.6% | 5.3% |
| C031 | City | 862 | 2 | $67,870 | 77.5% | 50.1% | 9.4% |
| C032 | City | 528 | 0 | $110,156 | 75.3% | 27.1% | 6.9% |
| C033 | City | 629 | 16 | $75,181 | 35.2% | 36.8% | 16.1% |
| C034 | City | 643 | 0 | $111,950 | 94.9% | 39.1% | 5.6% |
| C037 | City | 937 | 8 | $59,017 | 45.2% | 42.3% | 16.4% |
| C040 | City | 890 | 70 | $58,159 | 54.4% | 47.1% | 34.2% |
| C043 | City | 1,450 | 11 | $65,991 | 46.0% | 29.4% | 22.9% |
| R001 | Rural | 753 | 1 | $85,776 | 86.6% | 26.3% | 8.4% |
| R004 | Rural | 587 | 5 | $99,093 | 76.4% | 26.6% | 8.6% |
| R005 | Rural | 614 | 17 | $73,668 | 73.5% | 37.0% | 9.6% |
| R007 | Rural | 879 | 0 | $99,978 | 69.7% | 47.1% | 12.2% |
| R008 | Rural | 606 | 200 | $55,483 | 28.6% | 20.4% | 17.4% |
| R010 | Rural | 729 | 0 | $96,554 | 83.8% | 46.9% | 18.2% |
| R015 | Rural | 955 | 10 | $100,844 | 71.6% | 47.3% | 12.2% |
| R016 | Rural | 835 | 1 | $91,314 | 96.2% | 43.8% | 6.2% |
| R019 | Rural | 701 | 45 | $103,187 | 69.2% | 40.9% | 9.9% |
| R021 | Rural | 578 | 62 | $72,652 | 62.1% | 40.6% | 12.7% |
| R023 | Rural | 927 | 42 | $107,809 | 82.9% | 46.2% | 7.5% |
| R025 | Rural | 651 | 0 | $107,781 | 88.5% | 49.6% | 12.1% |
| R030 | Rural | 779 | 12 | $119,096 | 81.7% | 39.9% | 12.3% |
| R031 | Rural | 1,058 | 52 | $64,297 | 35.4% | 22.0% | 13.0% |
| R032 | Rural | 1,255 | 14 | $77,732 | 71.6% | 38.1% | 11.1% |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 77521 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
- 77562 — Highlands CDP, TX (5.6 mi)
- 77520 — Baytown city, TX (5.7 mi)
- 77580 — Mont Belvieu city, TX (6 mi)
- 77523 — Mont Belvieu city, TX (6.6 mi)
- 77530 — Channelview CDP, TX (9.2 mi)
- 77532 — Barrett CDP, TX (10.1 mi)
- 77571 — La Porte city, TX (10.2 mi)
- 77049 — Sheldon CDP, TX (11.2 mi)
Areas that include 77521
- Baytown, TX ZIP codes — 3 ZIP codes
- Chambers County ZIP codes — 8 ZIP codes
- Harris County ZIP codes — 136 ZIP codes
- Houston ZIP code map — 238 ZIP codes
- Texas ZIP code data
Where it ranks
Mail every home in 77521
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.
Baytown EDDM mailing
EDDM guides
ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 77521, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 77521 in?
- 77521 is a Baytown, TX mailing address. By land area, 35% lies inside Baytown and 1% lies inside Mont Belvieu; the rest is outside any Census-defined city or community.
- What county is 77521 in?
- 77521 is mostly in Harris County (77% of its land), with smaller parts in Chambers County.
- What is the population of 77521?
- About 69,038 people (±2,684), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 65,058.
- What is the median household income in 77521?
- $73,629 (±$6,795), compared with $78,476 for Texas as a whole. Half the households in the ZIP code earn more and half earn less.
- How many carrier routes and mailboxes are in 77521?
- 34 USPS carrier routes with 26,860 residential and 1,231 business mailboxes (28,091 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 77521?
- The closest, measured center to center: 77562 (5.6 mi, Highlands), 77520 (5.7 mi, Baytown), 77580 (6 mi, Mont Belvieu), 77523 (6.6 mi, Mont Belvieu), 77530 (9.2 mi, Channelview) and 77532 (10.1 mi, Barrett).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.