County ZIP codes · Texas · FIPS 48339
Montgomery County, TX ZIP Codes
Montgomery County, Texas has 31 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 26 residential and 5 for PO boxes or a single organization. 22 of the residential ones lie mainly in Montgomery County and 4 mainly in a neighboring county; 12 cross the county line. Median household income ranges from $62,428 in 77328 (Cleveland) to $162,384 in 77382 (Spring) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Montgomery County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $76,257 and $112,504.
They carry 14 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 26 residential ZIP codes in Montgomery County
22 ZIP codes lie mainly in Montgomery County; 4 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 77386 | Spring | 69,980 | 1,717 | $133k | $367k | 100% |
| 77365 | Porter | 46,418 | 1,124 | $96k | $289k | 96% |
| 77354 | Magnolia | 44,900 | 605 | $113k | $397k | 100% |
| 77304 | Conroe | 44,225 | 1,103 | $80k | $355k | 100% |
| 77382 | Spring | 38,986 | 3,248 | $162k | $567k | 100% |
| 77301 | Conroe | 37,769 | 1,872 | $67k | $219k | 100% |
| 77357 | New Caney | 37,592 | 560 | $76k | $246k | 82% |
| 77381 | Spring | 36,139 | 2,851 | $144k | $474k | 100% |
| 77316 | Montgomery | 34,694 | 269 | $124k | $431k | 96% |
| 77355 | Magnolia | 32,847 | 591 | $102k | $341k | 90% |
| 77356 | Montgomery | 32,583 | 256 | $107k | $410k | 98% |
| 77380 | Spring | 31,369 | 2,524 | $89k | $376k | 100% |
| 77303 | Conroe | 28,854 | 474 | $75k | $241k | 100% |
| 77385 | Conroe | 28,156 | 1,297 | $117k | $327k | 100% |
| 77384 | Conroe | 26,781 | 1,452 | $92k | $422k | 100% |
| 77302 | Conroe | 21,546 | 407 | $85k | $266k | 100% |
| 77318 | Willis | 20,792 | 561 | $92k | $317k | 100% |
| 77306 | Conroe | 18,086 | 440 | $76k | $174k | 100% |
| 77378 | Willis | 17,629 | 198 | $71k | $200k | 61% |
| 77372 | Splendora | 14,367 | 279 | $79k | $231k | 87% |
| 77362 | Pinehurst | 8,017 | 749 | $87k | $366k | 100% |
| 77873 | Richards | 1,383 | 15 | $81k | $285k | 44% |
Partly in Montgomery County
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
12 ZIP codes of Montgomery County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Montgomery | Elsewhere |
|---|---|---|
| 77365 | 96% | Harris County 4% |
| 77339 | 24% | Harris County 76% |
| 77357 | 82% | Harris County 10%; Liberty County 8% |
| 77316 | 96% | Grimes County 4% |
| 77355 | 90% | Waller County 10% |
| 77356 | 98% | Grimes County 2% |
| 77447 | 5% | Harris County 67%; Waller County 29% |
| 77378 | 61% | San Jacinto County 40% |
| 77328 | 22% | San Jacinto County 70%; Liberty County 8% |
| 77372 | 87% | Liberty County 13% |
| 77358 | 6% | Walker County 72%; San Jacinto County 22% |
| 77873 | 44% | Grimes County 35%; Walker County 21% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Montgomery County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Montgomery County's ZIP codes use 3 prefixes: 773, 774 and 778.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 773 | North Houston, TX (SCF 773) | 29 | 73 |
| 774 | South Houston, TX (SCF 774) | 1 | 83 |
| 778 | North Houston, TX (SCF 773) | 1 | 47 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.