ZIP code · Markham · Texas · United States
ZIP code 77456 — Markham
ZIP code 77456 serves Markham, Texas.
- Postal code
- 77456Single source Value from one source, not cross-checked.
- City
- Markham
- County
- Matagorda FIPS 48321
- State
- Texas
- Country
- United States
- Coordinates
- 28.9547, -96.0928 — precision precise (locality)
View on OpenStreetMap - Population
- 1,447 (ZCTA, ACS 5-year)
- Population density
- 37 / sq mi
- Land area
- 39.6 sq mi (102.5 km²) (ZCTA, ACS 5-year)
- Median household income
- $53,929
- Per-capita income
- $17,498
- Median age
- 20.6
- Households
- 384
- Housing units
- 434
- Median home value
- $119,100
- Congressional district
- TX-22 (119th Congress)
- USDA hardiness zone
- 9b (25 to 30 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/Chicago (UTC−6 / UTC−5 DST)
- Area code
- 979Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.
Tools: compare 77456 with another ZIP · ZIPs within 25 miles · distance from 77456
Map of ZIP code 77456
Climate — monthly normals
Warmest month Aug (avg high 91°F), coldest Jan (avg low 43°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 63 | 67 | 72 | 78 | 84 | 89 | 91 | 91 | 88 | 81 | 72 | 65 |
| Avg low °F | 43 | 47 | 53 | 59 | 66 | 72 | 73 | 73 | 69 | 60 | 51 | 45 |
| Precip in | 3.8 | 2.5 | 3.0 | 3.2 | 4.4 | 5.7 | 4.5 | 4.3 | 5.8 | 4.2 | 4.0 | 3.6 |
NOAA 1991–2020 climate normals from the nearest station: BAY CITY WTR WKS (7.3 mi) · NOAA NCEI
Places in ZIP 77456
- 1 schools
- 1 parks
- 2 playgrounds
- 1 post offices
- 5 places of worship
- 3 police & fire stations
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page