Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — ZIP/77021

77021

ZIP 77021 is in Houston, Texas, in Harris County; area codes 713, 832, 346 and 281; Central time. Houston has 178 ZIP codes in all.

Type
Standard
Time zone
America/Chicago
County
Harris
Population
26,153
Coordinates
29.6984, -95.3569
☼ Live from 77021 — Houston, TX

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 77021 is

Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.

★ Weird and wonderful facts about 77021
  • 🔢 Type 77021 into a pocket calculator and turn it upside down: IZOLL — not quite a word, sorry.
  • ➕ As a number, 77,021 = 7 × 11003. Its digits add up to 17, a total 2,133 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10010110011011101
  • 🏠 Its numerical neighbours: 77020 (Houston, TX, 6 mi away) and 77022 (Houston, TX, 9 mi away).
  • 🔄 Backwards, 77021 becomes 12077 — and that is a real ZIP code: Glenmont, NY, 1,490 miles away.
  • 👥 37 other ZIP codes are made of exactly the same digits (01772, 02717, 02771, 07712, 07721, 10277, …). The farthest-flung twin is 02717 in East Freetown, MA, 1,592 miles away.
  • 🧭 Farther south than 94% of all ZIP codes, and farther west than 69%.
  • 🎯723 miles south of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 77021 and you would come out at 29.70°S, 84.64°E — 1,442 miles from West Island, Cocos Islands, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 03m of daylight. Shortest: 10h 14m.
  • 📏 At 6.1 square miles of land, 77021 is bigger than 21% of ZIP codes — room for about 4.6 Central Parks.
🌙 The sky over 77021 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population26,153This ZIP26,153
Households11,258This ZIP11,258
Housing units12,986This ZIP12,986
Median age36.5This ZIP36.5Texas35.6US 38.9
Median household income$45,574This ZIP$45,574Texas$78,476US $80,734
Median home value$227,900This ZIP$227,900Texas$283,800US $332,700
Median gross rent$1,236This ZIP$1,236Texas$1,403US $1,413
Bachelor's degree or higher33.0%This ZIP33.0%
Mean commute28.6 minThis ZIP28.6 min
Population density4,303.6 / sq miThis ZIP4,303.6 / sq mi

Business and tax activity

Business establishments435This ZIP435
Employees8,079This ZIP8,079
Annual payroll$409,605,000This ZIP$409,605,000
Tax returns filed11,320This ZIP11,320
Total adjusted gross income$603,007,000This ZIP$603,007,000

Land area

Land area6.08 sq miThis ZIP6.08 sq mi
Water area0.03 sq miThis ZIP0.03 sq mi

Other place names in 77021

Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.

ZIP codes near 77021

ZIPCityDistance
77204 Houston, TX 1.7 mi
77004 Houston, TX 1.8 mi
77033 Houston, TX 2.4 mi
77030 Houston, TX 2.7 mi
77023 Houston, TX 2.8 mi
77054 Houston, TX 3.1 mi
77051 Houston, TX 3.2 mi
77087 Houston, TX 3.3 mi
77292 Houston, TX 3.5 mi
77006 Houston, TX 3.6 mi

Find every ZIP code within 10 miles of 77021 →

Questions about this ZIP code

Where is ZIP code 77021?

77021 is in Houston, Texas, in Harris County, part of the Houston-Pasadena-The Woodlands, TX metropolitan area. Its published point location is 29.6984, -95.3569.

What county is 77021 in?

77021 lies in Harris County.

What area code is 77021?

Houston uses area codes 713, 832, 346 and 281, from NANPA's telephone records.

What time zone is 77021 in?

77021 uses America/Chicago.

How many people live in 77021?

About 26,153 people live in ZIP code 77021, in 11,258 households, at 4,303.6 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.

What is the median household income in 77021?

$45,574 a year, against $78,476 across Texas.

What ZIP codes are near 77021?

The closest are 77204 (1.7 mi), 77004 (1.8 mi), 77033 (2.4 mi), 77030 (2.7 mi) and 77023 (2.8 mi).

Is 77021 a PO Box ZIP code?

77021 is a standard ZIP code. A normal ZIP code with street delivery.

Download or cite

Cite this page

zipcodes.pro. “77021 ZIP Code — Houston, Texas (Harris County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/77021

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/77021.json

Underlying data is public domain or openly licensed — sources, vintages and licences.