78203 ZIP Code, San Antonio, TX
78203 is a ZIP code in San Antonio, Texas in Bexar County. It covers 1.4 square miles of land, centered about 2.2 miles east of downtown San Antonio. The closest ZIP codes are 78202, 78210 and 78205. 5,200 people live here in 1,802 households. At about 3,804 people per square mile it has suburban density, and owners and renters are mixed (45% own). Median household income is $35,536, well below the Texas median of $78,476.
Quick facts
- Mailing city: San Antonio, TX
- County: Bexar County
- Metro area: San Antonio
- Land area: 1.4 sq mi
- Population: 5,200
- Median household income: $35,536
- Carrier routes: 4 (2,403 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 5,200 |
| Households | 1,802 |
| Median household income | $35,536 |
| Income per person | $18,976 |
| Median age | 33.4 |
| Homeowners | 45.1% |
| Median home value | $158,000 |
| Median rent | $1,051 |
| Bachelor's degree or higher | 10.8% |
| Average commute (minutes) | 22.1 |
| Households with kids under 18 | 37.0% |
| Moved in the past year | 15.3% |
| Below the poverty line | 39.1% |
| Broadband internet | 80.4% |
| Speak a non-English language at home | 48.6% |
Household income
| % of households | Value |
|---|---|
| <$10K | 15.6% |
| $10–15K | 8.2% |
| $15–25K | 13.4% |
| $25–35K | 12.3% |
| $35–50K | 8.9% |
| $50–75K | 15.2% |
| $75–100K | 11.0% |
| $100–150K | 10.9% |
| $150–200K | 3.9% |
| $200K+ | 0.5% |
Age
| % of all residents | Value |
|---|---|
| <10 | 15.1% |
| 10–19 | 16.4% |
| 20–24 | 7.3% |
| 25–34 | 12.3% |
| 35–44 | 17.0% |
| 45–54 | 12.3% |
| 55–64 | 12.4% |
| 65–74 | 5.1% |
| 75+ | 2.1% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 14.0% |
| Owned outright | 19.9% |
| Rented | 41.4% |
| Vacant | 24.7% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 69.3% |
| Townhome | 5.4% |
| 2–4 units | 14.2% |
| 5–19 units | 8.0% |
| 20+ units | 2.2% |
| Mobile / other | 1.0% |
Businesses in 78203
78 business establishments with 805 employees (ZIP Codes Business Patterns 2023).
- Other Services (except Public Administration): 23
- Accommodation and Food Services: 17
- Retail Trade: 8
- Health Care and Social Assistance: 5
- Construction: 4
- Wholesale Trade: 4
- Administrative and Support and Waste Management and Remediation Services: 4
- Arts, Entertainment, and Recreation: 3
EDDM carrier routes
78203 has 4 USPS carrier routes with 2,403 residential and 173 business mailboxes. Open the EDDM route map.
Carrier routes in 78203
78203 has 4 USPS carrier routes (4 city (C)) with 2,403 residential and 173 business mailboxes. Routes range from 524 homes (C054) to 734 homes (C064); the median route has 573 homes. The Census counted 1,802 households in 78203 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 0 |
| 250–499 | 0 |
| 500–749 | 4 |
| 750–999 | 0 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 78203 for…
Highest income
For bigger-ticket offers: remodeling, pools, financial planning, private schools.
- Route C054 — Est. median household income $66,822, 524 homes
- Route C051 — Est. median household income $46,328, 597 homes
- Route C066 — Est. median household income $34,074, 548 homes
- Route C064 — Est. median household income $33,756, 734 homes
Select these 4 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 C054 — Est. families with children under 18 53.7%, 524 homes
- Route C051 — Est. families with children under 18 39.3%, 597 homes
- Route C064 — Est. families with children under 18 36.3%, 734 homes
- Route C066 — Est. families with children under 18 29.2%, 548 homes
Select these 4 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 C051 — Est. owner-occupied homes 61.0%, 597 homes
- Route C054 — Est. owner-occupied homes 57.7%, 524 homes
- Route C064 — Est. owner-occupied homes 52.0%, 734 homes
- Route C066 — Est. owner-occupied homes 36.2%, 548 homes
Select these 4 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 C066 — Est. residents who moved in the past year 18.8%, 548 homes
- Route C051 — Est. residents who moved in the past year 13.9%, 597 homes
- Route C054 — Est. residents who moved in the past year 9.0%, 524 homes
- Route C064 — Est. residents who moved in the past year 5.8%, 734 homes
Select these 4 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 C054 — Est. homes built 2010 or later 9.0%, 524 homes
- Route C051 — Est. homes built 2010 or later 6.0%, 597 homes
- Route C064 — Est. homes built 2010 or later 4.6%, 734 homes
- Route C066 — Est. homes built 2010 or later 1.7%, 548 homes
Select these 4 routes on the route map
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route C066 — USPS business mailboxes 79, 548 homes
- Route C051 — USPS business mailboxes 36, 597 homes
- Route C054 — USPS business mailboxes 31, 524 homes
- Route C064 — USPS business mailboxes 27, 734 homes
Select these 4 routes on the route map
Every carrier route in 78203
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C051 | City | 597 | 36 | $46,328 | 61.0% | 39.3% | 13.9% |
| C054 | City | 524 | 31 | $66,822 | 57.7% | 53.7% | 9.0% |
| C064 | City | 734 | 27 | $33,756 | 52.0% | 36.3% | 5.8% |
| C066 | City | 548 | 79 | $34,074 | 36.2% | 29.2% | 18.8% |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 78203 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
- 78202 — San Antonio city, TX (0.9 mi)
- 78210 — San Antonio city, TX (1.4 mi)
- 78205 — San Antonio city, TX (1.7 mi)
- 78208 — San Antonio city, TX (1.7 mi)
- 78215 — San Antonio city, TX (2.2 mi)
- 78204 — San Antonio city, TX (2.8 mi)
- 78234 — San Antonio city, TX (3.4 mi)
- 78220 — San Antonio city, TX (3.7 mi)
Areas that include 78203
- San Antonio, TX ZIP codes — 64 ZIP codes
- Bexar County ZIP codes — 76 ZIP codes
- San Antonio ZIP code map — 121 ZIP codes
- Texas ZIP code data
Where it ranks
- No. 21 of 104: lowest median age in the San Antonio area
- No. 20 of 74: lowest median age in Bexar County
- No. 19 of 63: lowest median age in San Antonio, TX
Mail every home in 78203
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.
San Antonio EDDM mailing
EDDM guides
ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 78203, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 78203 in?
- 78203 is a San Antonio, TX mailing address. By land area, 100% lies inside San Antonio.
- What county is 78203 in?
- 78203 is in Bexar County.
- What is the population of 78203?
- About 5,200 people (±1,108), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 5,872.
- What is the median household income in 78203?
- $35,536 (±$14,627), 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 78203?
- 4 USPS carrier routes with 2,403 residential and 173 business mailboxes (2,576 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 78203?
- The closest, measured center to center: 78202 (0.9 mi, San Antonio), 78210 (1.4 mi, San Antonio), 78205 (1.7 mi, San Antonio), 78208 (1.7 mi, San Antonio), 78215 (2.2 mi, San Antonio) and 78204 (2.8 mi, San Antonio).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.