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77458
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  3. ZIP Code 77458
Texas (TX)Matagorda CountyBay City361

ZIP Code 77458 — Midfield, TX

Matagorda County * Bay City metro

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What stands out

  • Snapshot data is limited for this ZIP.

Categories vs U.S.

Economy

Economy metrics are not available for this ZIP. This is common for USPS ZIP codes that don't map cleanly to a Census ZIP Code Tabulation Area (ZCTA), which is what ACS estimates are published for.

Housing stress

Health

0 of 6 available metrics better than U.S.

CDC PLACES modeled ZCTA-level estimates (adult prevalence).

Obesity

41.4%

U.S.

33.3%

Diabetes

16.1%

U.S.

12.0%

Current smoking

17.0%

U.S.

13.1%

Connectivity

2 of 3 metrics better than U.S.

Best available speed

1,000Mbps

Gigabit speeds reported

100+ Mbps coverage

81.1%

U.S.

85.3%

Gigabit ready

35.3%

U.S.

8.6%

5G available

97.9%

U.S.

77.4%

Learning

Education metrics come from ACS 5-year estimates for ZIP Code Tabulation Areas (ZCTAs).

Learning metrics are not available for this ZIP.

ZIP-level estimates can have higher margins of error than county/state totals; treat small differences as noise.

School districts

Tidehaven Independent School District

Map

ZIP 77458

Midfield, TX

Population

—

Area

21.9 sq mi

Density

—

Neighbors

7741477419774377745577456
More Details

Census Tracts

1 tracts overlap this ZIP. Hover over segments to explore.

100%

Tract 7307

100%

Total tracts: 1Coverage: 100.0%

Representation

U.S. House

ZIP codes can span multiple congressional districts. Overlap percentages are approximate by land area. Verify by address.

100%

TX-22

100%

Districts: 1Coverage: 100.0%

Data freshness

ACS 5-Year
2020–2024
CDC PLACES
2025
Broadband
2020-12
Mobile
2025-11-24
Page Updated
2026-02-23

Release schedule and upstream dates: Sources.

Data sources

US Census Bureau (ACS 5-year)HUD USPS ZIP crosswalkUS Census TIGER/Line (geometry inputs)US Census TIGER/Line (school districts)US Census Bureau (ZCTA-to-tract relationship, 2020)US Census Bureau (2020 ZCTA-to-congressional-district relationship file, CD119)CDC PLACES (ZCTA)FCC (Form 477 broadband)FCC (Mobile Broadband Data Collection)

Derived statistics

  • ZIP pages use Census ZIP Code Tabulation Areas (ZCTAs), not USPS delivery routes.
  • Population density is computed as population ÷ land area.
  • Overlap percentages (tracts and districts) are derived from map geometry and are approximate.

Data accuracy & methodology

ZIP pages combine 2020–2024 ACS 5-year ZCTA estimates with other public datasets when available (see Sources). Connectivity metrics use FCC coverage data, not ACS. ZIP-level estimates can have higher margins of error than county/state totals; treat small differences as statistical noise rather than precise changes.